mfd: Add DT bindings documentation for Samsung Exynos LPASS

This patch adds documentation of the DT bindings for the Samsung
Exynos SoC Low Power Audio Subsystem.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt b/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
new file mode 100644 (file)
index 0000000..c110e11
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
@@ -0,0 +1,70 @@
+Samsung Exynos SoC Low Power Audio Subsystem (LPASS)
+
+Required properties:
+
+ - compatible          : "samsung,exynos5433-lpass"
+ - reg                 : should contain the LPASS top SFR region location
+                         and size
+ - samsung,pmu-syscon  : the phandle to the Power Management Unit node
+ - #address-cells      : should be 1
+ - #size-cells         : should be 1
+ - ranges              : must be present
+
+Each IP block of the Low Power Audio Subsystem should be specified as
+an optional sub-node. For "samsung,exynos5433-lpass" compatible this includes:
+UART, SLIMBUS, PCM, I2S, DMAC, Timers 0...4, VIC, WDT 0...1 devices.
+
+Bindings of the sub-nodes are described in:
+  ../serial/samsung_uart.txt
+  ../sound/samsung-i2s.txt
+  ../dma/arm-pl330.txt
+
+
+Example:
+
+audio-subsystem {
+       compatible = "samsung,exynos5433-lpass";
+       reg = <0x11400000 0x100>, <0x11500000 0x08>;
+       samsung,pmu-syscon = <&pmu_system_controller>;
+       #address-cells = <1>;
+       #size-cells = <1>;
+       ranges;
+
+       adma: adma@11420000 {
+               compatible = "arm,pl330", "arm,primecell";
+               reg = <0x11420000 0x1000>;
+               interrupts = <0 73 0>;
+               clocks = <&cmu_aud CLK_ACLK_DMAC>;
+               clock-names = "apb_pclk";
+               #dma-cells = <1>;
+               #dma-channels = <8>;
+               #dma-requests = <32>;
+       };
+
+       i2s0: i2s0@11440000 {
+               compatible = "samsung,exynos7-i2s";
+               reg = <0x11440000 0x100>;
+               dmas = <&adma 0 &adma 2>;
+               dma-names = "tx", "rx";
+               interrupts = <0 70 0>;
+               clocks = <&cmu_aud CLK_PCLK_AUD_I2S>,
+                        <&cmu_aud CLK_SCLK_AUD_I2S>,
+                        <&cmu_aud CLK_SCLK_I2S_BCLK>;
+               clock-names = "iis", "i2s_opclk0", "i2s_opclk1";
+               pinctrl-names = "default";
+               pinctrl-0 = <&i2s0_bus>;
+               status = "disabled";
+       };
+
+       serial_3: serial@11460000 {
+               compatible = "samsung,exynos5433-uart";
+               reg = <0x11460000 0x100>;
+               interrupts = <0 67 0>;
+               clocks = <&cmu_aud CLK_PCLK_AUD_UART>,
+                        <&cmu_aud CLK_SCLK_AUD_UART>;
+               clock-names = "uart", "clk_uart_baud0";
+               pinctrl-names = "default";
+               pinctrl-0 = <&uart_aud_bus>;
+               status = "disabled";
+       };
+ };