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21 lines
530 B
21 lines
530 B
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Some small helpers for older Cirrus Logic parts. |
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* |
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* Copyright (C) 2021 Cirrus Logic, Inc. and |
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* Cirrus Logic International Semiconductor Ltd. |
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*/ |
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static inline int cirrus_read_device_id(struct regmap *regmap, unsigned int reg) |
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{ |
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u8 devid[3]; |
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int ret; |
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ret = regmap_bulk_read(regmap, reg, devid, ARRAY_SIZE(devid)); |
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if (ret < 0) |
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return ret; |
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return ((devid[0] & 0xFF) << 12) | |
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((devid[1] & 0xFF) << 4) | |
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((devid[2] & 0xF0) >> 4); |
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}
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