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43 lines
1.4 KiB
43 lines
1.4 KiB
Rockchip EMMC PHY |
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Required properties: |
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- compatible: rockchip,rk3399-emmc-phy |
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- #phy-cells: must be 0 |
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- reg: PHY register address offset and length in "general |
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register files" |
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Optional properties: |
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- clock-names: Should contain "emmcclk". Although this is listed as optional |
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(because most boards can get basic functionality without having |
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access to it), it is strongly suggested. |
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See ../clock/clock-bindings.txt for details. |
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- clocks: Should have a phandle to the card clock exported by the SDHCI driver. |
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- drive-impedance-ohm: Specifies the drive impedance in Ohm. |
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Possible values are 33, 40, 50, 66 and 100. |
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If not set, the default value of 50 will be applied. |
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- rockchip,enable-strobe-pulldown: Enable internal pull-down for the strobe |
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line. If not set, pull-down is not used. |
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- rockchip,output-tapdelay-select: Specifies the phyctrl_otapdlysec register. |
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If not set, the register defaults to 0x4. |
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Maximum value 0xf. |
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Example: |
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grf: syscon@ff770000 { |
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compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd"; |
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#address-cells = <1>; |
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#size-cells = <1>; |
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... |
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emmcphy: phy@f780 { |
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compatible = "rockchip,rk3399-emmc-phy"; |
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reg = <0xf780 0x20>; |
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clocks = <&sdhci>; |
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clock-names = "emmcclk"; |
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drive-impedance-ohm = <50>; |
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#phy-cells = <0>; |
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}; |
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};
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