This SD/eMMC controller is used for UniPhier SoC family.
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---
.../devicetree/bindings/mmc/uniphier-sd.txt | 60 ++++++++++++++++++++++
1 file changed, 60 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/uniphier-sd.txt
diff --git a/Documentation/devicetree/bindings/mmc/uniphier-sd.txt b/Documentation/devicetree/bindings/mmc/uniphier-sd.txt
new file mode 100644
index 0000000..49dd0fc
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/uniphier-sd.txt
@@ -0,0 +1,60 @@
+UniPhier SD/eMMC controller
+
+Required properties:
+- compatible: should be one of the following:
+ "socionext,uniphier-sd-v2.91" - IP version 2.91
+ "socionext,uniphier-sd-v3.1" - IP version 3.1
+ "socionext,uniphier-sd-v3.1b" - IP version 3.1 (bug-fix ver.) [1]
+- reg: offset and length of the register set for the device.
+- interrupts: a single interrupt specifier.
+- clocks: a single clock specifier of the controller clock.
+- reset-names: should contain the following:
+ "host" - mandatory for all versions
+ "bridge" - should exist only for "socionext,uniphier-sd-v2.91"
+ "hw" - should exist if eMMC hw reset line is available
+- resets: a list of reset specifiers, corresponding to the reset-names
+
+[1] There are two different controller cores for version 3.1. The early
+ release had a bug in the DMA RX channel. The issue was fixed later,
+ but the version number was not incremented. Hence, the latter has
+ 'b' at the end of its compatible string.
+
+Optional properties:
+- pinctrl-names: if present, should contain the following:
+ "default" - should exist for all instances
+ "uhs" - should exist for SD instance with UHS support
+- pinctrl-0: pin control state for the default mode
+- pinctrl-1: pin control state for the UHS mode
+- dma-names: should be "rx-tx" if present.
+ This property can exist only for "socionext,uniphier-sd-v2.91".
+- dmas: a single DMA channel specifier
+ This property can exist only for "socionext,uniphier-sd-v2.91".
+- bus-width: see mmc.txt
+- cap-sd-highspeed: see mmc.txt
+- cap-mmc-highspeed: see mmc.txt
+- sd-uhs-sdr12: see mmc.txt
+- sd-uhs-sdr25: see mmc.txt
+- sd-uhs-sdr50: see mmc.txt
+- cap-mmc-hw-reset: should exist if reset-names contains "hw". see mmc.txt
+- non-removable: see mmc.txt
+
+Example:
+
+ sd: sdhc@5a400000 {
+ compatible = "socionext,uniphier-sd-v2.91";
+ reg = <0x5a400000 0x200>;
+ interrupts = <0 76 4>;
+ pinctrl-names = "default", "uhs";
+ pinctrl-0 = <&pinctrl_sd>;
+ pinctrl-1 = <&pinctrl_sd_uhs>;
+ clocks = <&mio_clk 0>;
+ reset-names = "host", "bridge";
+ resets = <&mio_rst 0>, <&mio_rst 3>;
+ dma-names = "rx-tx";
+ dmas = <&dmac 4>;
+ bus-width = <4>;
+ cap-sd-highspeed;
+ sd-uhs-sdr12;
+ sd-uhs-sdr25;
+ sd-uhs-sdr50;
+ };
--
2.7.4
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