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427 lines
12 KiB
427 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/ |
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* Nishanth Menon <[email protected]> |
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* Dave Gerlach <[email protected]> |
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* |
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* TI OPP supply driver that provides override into the regulator control |
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* for generic opp core to handle devices with ABB regulator and/or |
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* SmartReflex Class0. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/cpufreq.h> |
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#include <linux/device.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/notifier.h> |
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#include <linux/of_device.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_opp.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/slab.h> |
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/** |
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* struct ti_opp_supply_optimum_voltage_table - optimized voltage table |
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* @reference_uv: reference voltage (usually Nominal voltage) |
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* @optimized_uv: Optimized voltage from efuse |
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*/ |
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struct ti_opp_supply_optimum_voltage_table { |
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unsigned int reference_uv; |
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unsigned int optimized_uv; |
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}; |
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/** |
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* struct ti_opp_supply_data - OMAP specific opp supply data |
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* @vdd_table: Optimized voltage mapping table |
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* @num_vdd_table: number of entries in vdd_table |
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* @vdd_absolute_max_voltage_uv: absolute maximum voltage in UV for the supply |
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*/ |
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struct ti_opp_supply_data { |
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struct ti_opp_supply_optimum_voltage_table *vdd_table; |
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u32 num_vdd_table; |
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u32 vdd_absolute_max_voltage_uv; |
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}; |
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static struct ti_opp_supply_data opp_data; |
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/** |
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* struct ti_opp_supply_of_data - device tree match data |
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* @flags: specific type of opp supply |
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* @efuse_voltage_mask: mask required for efuse register representing voltage |
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* @efuse_voltage_uv: Are the efuse entries in micro-volts? if not, assume |
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* milli-volts. |
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*/ |
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struct ti_opp_supply_of_data { |
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#define OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE BIT(1) |
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#define OPPDM_HAS_NO_ABB BIT(2) |
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const u8 flags; |
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const u32 efuse_voltage_mask; |
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const bool efuse_voltage_uv; |
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}; |
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/** |
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* _store_optimized_voltages() - store optimized voltages |
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* @dev: ti opp supply device for which we need to store info |
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* @data: data specific to the device |
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* |
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* Picks up efuse based optimized voltages for VDD unique per device and |
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* stores it in internal data structure for use during transition requests. |
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* |
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* Return: If successful, 0, else appropriate error value. |
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*/ |
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static int _store_optimized_voltages(struct device *dev, |
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struct ti_opp_supply_data *data) |
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{ |
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void __iomem *base; |
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struct property *prop; |
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struct resource *res; |
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const __be32 *val; |
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int proplen, i; |
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int ret = 0; |
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struct ti_opp_supply_optimum_voltage_table *table; |
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const struct ti_opp_supply_of_data *of_data = dev_get_drvdata(dev); |
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/* pick up Efuse based voltages */ |
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res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 0); |
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if (!res) { |
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dev_err(dev, "Unable to get IO resource\n"); |
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ret = -ENODEV; |
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goto out_map; |
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} |
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base = ioremap(res->start, resource_size(res)); |
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if (!base) { |
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dev_err(dev, "Unable to map Efuse registers\n"); |
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ret = -ENOMEM; |
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goto out_map; |
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} |
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/* Fetch efuse-settings. */ |
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prop = of_find_property(dev->of_node, "ti,efuse-settings", NULL); |
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if (!prop) { |
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dev_err(dev, "No 'ti,efuse-settings' property found\n"); |
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ret = -EINVAL; |
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goto out; |
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} |
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proplen = prop->length / sizeof(int); |
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data->num_vdd_table = proplen / 2; |
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/* Verify for corrupted OPP entries in dt */ |
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if (data->num_vdd_table * 2 * sizeof(int) != prop->length) { |
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dev_err(dev, "Invalid 'ti,efuse-settings'\n"); |
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ret = -EINVAL; |
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goto out; |
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} |
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ret = of_property_read_u32(dev->of_node, "ti,absolute-max-voltage-uv", |
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&data->vdd_absolute_max_voltage_uv); |
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if (ret) { |
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dev_err(dev, "ti,absolute-max-voltage-uv is missing\n"); |
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ret = -EINVAL; |
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goto out; |
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} |
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table = kcalloc(data->num_vdd_table, sizeof(*data->vdd_table), |
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GFP_KERNEL); |
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if (!table) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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data->vdd_table = table; |
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val = prop->value; |
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for (i = 0; i < data->num_vdd_table; i++, table++) { |
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u32 efuse_offset; |
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u32 tmp; |
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table->reference_uv = be32_to_cpup(val++); |
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efuse_offset = be32_to_cpup(val++); |
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tmp = readl(base + efuse_offset); |
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tmp &= of_data->efuse_voltage_mask; |
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tmp >>= __ffs(of_data->efuse_voltage_mask); |
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table->optimized_uv = of_data->efuse_voltage_uv ? tmp : |
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tmp * 1000; |
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dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d vset=%d\n", |
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i, efuse_offset, table->reference_uv, |
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table->optimized_uv); |
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/* |
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* Some older samples might not have optimized efuse |
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* Use reference voltage for those - just add debug message |
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* for them. |
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*/ |
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if (!table->optimized_uv) { |
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dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d:vset0\n", |
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i, efuse_offset, table->reference_uv); |
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table->optimized_uv = table->reference_uv; |
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} |
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} |
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out: |
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iounmap(base); |
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out_map: |
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return ret; |
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} |
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/** |
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* _free_optimized_voltages() - free resources for optvoltages |
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* @dev: device for which we need to free info |
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* @data: data specific to the device |
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*/ |
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static void _free_optimized_voltages(struct device *dev, |
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struct ti_opp_supply_data *data) |
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{ |
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kfree(data->vdd_table); |
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data->vdd_table = NULL; |
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data->num_vdd_table = 0; |
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} |
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/** |
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* _get_optimal_vdd_voltage() - Finds optimal voltage for the supply |
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* @dev: device for which we need to find info |
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* @data: data specific to the device |
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* @reference_uv: reference voltage (OPP voltage) for which we need value |
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* |
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* Return: if a match is found, return optimized voltage, else return |
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* reference_uv, also return reference_uv if no optimization is needed. |
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*/ |
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static int _get_optimal_vdd_voltage(struct device *dev, |
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struct ti_opp_supply_data *data, |
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int reference_uv) |
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{ |
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int i; |
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struct ti_opp_supply_optimum_voltage_table *table; |
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if (!data->num_vdd_table) |
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return reference_uv; |
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table = data->vdd_table; |
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if (!table) |
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return -EINVAL; |
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/* Find a exact match - this list is usually very small */ |
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for (i = 0; i < data->num_vdd_table; i++, table++) |
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if (table->reference_uv == reference_uv) |
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return table->optimized_uv; |
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/* IF things are screwed up, we'd make a mess on console.. ratelimit */ |
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dev_err_ratelimited(dev, "%s: Failed optimized voltage match for %d\n", |
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__func__, reference_uv); |
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return reference_uv; |
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} |
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static int _opp_set_voltage(struct device *dev, |
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struct dev_pm_opp_supply *supply, |
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int new_target_uv, struct regulator *reg, |
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char *reg_name) |
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{ |
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int ret; |
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unsigned long vdd_uv, uv_max; |
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if (new_target_uv) |
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vdd_uv = new_target_uv; |
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else |
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vdd_uv = supply->u_volt; |
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/* |
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* If we do have an absolute max voltage specified, then we should |
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* use that voltage instead to allow for cases where the voltage rails |
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* are ganged (example if we set the max for an opp as 1.12v, and |
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* the absolute max is 1.5v, for another rail to get 1.25v, it cannot |
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* be achieved if the regulator is constrainted to max of 1.12v, even |
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* if it can function at 1.25v |
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*/ |
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if (opp_data.vdd_absolute_max_voltage_uv) |
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uv_max = opp_data.vdd_absolute_max_voltage_uv; |
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else |
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uv_max = supply->u_volt_max; |
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if (vdd_uv > uv_max || |
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vdd_uv < supply->u_volt_min || |
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supply->u_volt_min > uv_max) { |
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dev_warn(dev, |
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"Invalid range voltages [Min:%lu target:%lu Max:%lu]\n", |
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supply->u_volt_min, vdd_uv, uv_max); |
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return -EINVAL; |
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} |
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dev_dbg(dev, "%s scaling to %luuV[min %luuV max %luuV]\n", reg_name, |
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vdd_uv, supply->u_volt_min, |
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uv_max); |
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ret = regulator_set_voltage_triplet(reg, |
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supply->u_volt_min, |
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vdd_uv, |
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uv_max); |
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if (ret) { |
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dev_err(dev, "%s failed for %luuV[min %luuV max %luuV]\n", |
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reg_name, vdd_uv, supply->u_volt_min, |
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uv_max); |
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return ret; |
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} |
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return 0; |
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} |
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/** |
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* ti_opp_supply_set_opp() - do the opp supply transition |
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* @data: information on regulators and new and old opps provided by |
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* opp core to use in transition |
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* |
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* Return: If successful, 0, else appropriate error value. |
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*/ |
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static int ti_opp_supply_set_opp(struct dev_pm_set_opp_data *data) |
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{ |
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struct dev_pm_opp_supply *old_supply_vdd = &data->old_opp.supplies[0]; |
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struct dev_pm_opp_supply *old_supply_vbb = &data->old_opp.supplies[1]; |
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struct dev_pm_opp_supply *new_supply_vdd = &data->new_opp.supplies[0]; |
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struct dev_pm_opp_supply *new_supply_vbb = &data->new_opp.supplies[1]; |
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struct device *dev = data->dev; |
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unsigned long old_freq = data->old_opp.rate, freq = data->new_opp.rate; |
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struct clk *clk = data->clk; |
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struct regulator *vdd_reg = data->regulators[0]; |
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struct regulator *vbb_reg = data->regulators[1]; |
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int vdd_uv; |
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int ret; |
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vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data, |
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new_supply_vdd->u_volt); |
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if (new_supply_vdd->u_volt_min < vdd_uv) |
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new_supply_vdd->u_volt_min = vdd_uv; |
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/* Scaling up? Scale voltage before frequency */ |
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if (freq > old_freq) { |
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ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg, |
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"vdd"); |
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if (ret) |
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goto restore_voltage; |
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ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb"); |
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if (ret) |
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goto restore_voltage; |
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} |
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/* Change frequency */ |
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dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", |
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__func__, old_freq, freq); |
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ret = clk_set_rate(clk, freq); |
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if (ret) { |
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dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, |
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ret); |
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goto restore_voltage; |
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} |
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/* Scaling down? Scale voltage after frequency */ |
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if (freq < old_freq) { |
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ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb"); |
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if (ret) |
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goto restore_freq; |
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ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg, |
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"vdd"); |
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if (ret) |
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goto restore_freq; |
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} |
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return 0; |
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restore_freq: |
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ret = clk_set_rate(clk, old_freq); |
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if (ret) |
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dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
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__func__, old_freq); |
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restore_voltage: |
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/* This shouldn't harm even if the voltages weren't updated earlier */ |
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if (old_supply_vdd->u_volt) { |
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ret = _opp_set_voltage(dev, old_supply_vbb, 0, vbb_reg, "vbb"); |
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if (ret) |
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return ret; |
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ret = _opp_set_voltage(dev, old_supply_vdd, 0, vdd_reg, |
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"vdd"); |
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if (ret) |
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return ret; |
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} |
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return ret; |
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} |
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static const struct ti_opp_supply_of_data omap_generic_of_data = { |
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}; |
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static const struct ti_opp_supply_of_data omap_omap5_of_data = { |
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.flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE, |
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.efuse_voltage_mask = 0xFFF, |
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.efuse_voltage_uv = false, |
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}; |
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static const struct ti_opp_supply_of_data omap_omap5core_of_data = { |
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.flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE | OPPDM_HAS_NO_ABB, |
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.efuse_voltage_mask = 0xFFF, |
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.efuse_voltage_uv = false, |
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}; |
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static const struct of_device_id ti_opp_supply_of_match[] = { |
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{.compatible = "ti,omap-opp-supply", .data = &omap_generic_of_data}, |
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{.compatible = "ti,omap5-opp-supply", .data = &omap_omap5_of_data}, |
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{.compatible = "ti,omap5-core-opp-supply", |
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.data = &omap_omap5core_of_data}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, ti_opp_supply_of_match); |
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static int ti_opp_supply_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct device *cpu_dev = get_cpu_device(0); |
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const struct of_device_id *match; |
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const struct ti_opp_supply_of_data *of_data; |
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int ret = 0; |
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match = of_match_device(ti_opp_supply_of_match, dev); |
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if (!match) { |
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/* We do not expect this to happen */ |
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dev_err(dev, "%s: Unable to match device\n", __func__); |
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return -ENODEV; |
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} |
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if (!match->data) { |
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/* Again, unlikely.. but mistakes do happen */ |
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dev_err(dev, "%s: Bad data in match\n", __func__); |
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return -EINVAL; |
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} |
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of_data = match->data; |
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dev_set_drvdata(dev, (void *)of_data); |
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/* If we need optimized voltage */ |
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if (of_data->flags & OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE) { |
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ret = _store_optimized_voltages(dev, &opp_data); |
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if (ret) |
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return ret; |
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} |
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ret = PTR_ERR_OR_ZERO(dev_pm_opp_register_set_opp_helper(cpu_dev, |
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ti_opp_supply_set_opp)); |
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if (ret) |
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_free_optimized_voltages(dev, &opp_data); |
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return ret; |
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} |
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static struct platform_driver ti_opp_supply_driver = { |
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.probe = ti_opp_supply_probe, |
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.driver = { |
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.name = "ti_opp_supply", |
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.of_match_table = of_match_ptr(ti_opp_supply_of_match), |
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}, |
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}; |
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module_platform_driver(ti_opp_supply_driver); |
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MODULE_DESCRIPTION("Texas Instruments OMAP OPP Supply driver"); |
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MODULE_AUTHOR("Texas Instruments Inc."); |
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MODULE_LICENSE("GPL v2");
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