mfd: dt-bindings: Add Device Tree bindings for HI6421

Add documentation for HiSilicon Hi6421 PMIC DT binding.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/mfd/hi6421.txt b/Documentation/devicetree/bindings/mfd/hi6421.txt
new file mode 100644 (file)
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+* HI6421 Multi-Functional Device (MFD), by HiSilicon Ltd.
+
+Required parent device properties:
+- compatible   : contains "hisilicon,hi6421-pmic";
+- reg          : register range space of hi6421;
+
+Supported Hi6421 sub-devices include:
+
+Device                     IRQ Names              Supply Names   Description
+------                     ---------              ------------   -----------
+regulators               :  None                 : None         : Regulators
+
+Required child device properties:
+None.
+
+Example:
+       hi6421 {
+               compatible = "hisilicon,hi6421-pmic";
+               reg = <0xfcc00000 0x0180>; /* 0x60 << 2 */
+
+               regulators {
+                       // supply for MLC NAND/ eMMC
+                       hi6421_vout0_reg: hi6421_vout0 {
+                               regulator-name = "VOUT0";
+                               regulator-min-microvolt = <2850000>;
+                               regulator-max-microvolt = <2850000>;
+                       };
+
+                       // supply for 26M Oscillator
+                       hi6421_vout1_reg: hi6421_vout1 {
+                               regulator-name = "VOUT1";
+                               regulator-min-microvolt = <1700000>;
+                               regulator-max-microvolt = <2000000>;
+                               regulator-boot-on;
+                               regulator-always-on;
+                       };
+               };
+       };