mmc: dt-bindings: add ZTE ZX296718 MMC bindings

Document the device-tree binding of ZTE MMC host on
ZX296718 SoC.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt
new file mode 100644 (file)
index 0000000..eaade0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt
@@ -0,0 +1,33 @@
+* ZTE specific extensions to the Synopsys Designware Mobile Storage
+  Host Controller
+
+The Synopsys designware mobile storage host controller is used to interface
+a SoC with storage medium such as eMMC or SD/MMC cards. This file documents
+differences between the core Synopsys dw mshc controller properties described
+by synopsys-dw-mshc.txt and the properties used by the ZTE specific
+extensions to the Synopsys Designware Mobile Storage Host Controller.
+
+Required Properties:
+
+* compatible: should be
+       - "zte,zx296718-dw-mshc": for ZX SoCs
+
+Example:
+
+       mmc1: mmc@1110000 {
+               compatible = "zte,zx296718-dw-mshc";
+               reg = <0x01110000 0x1000>;
+               interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>;
+               fifo-depth = <32>;
+               data-addr = <0x200>;
+               fifo-watermark-aligned;
+               bus-width = <4>;
+               clock-frequency = <50000000>;
+               clocks = <&topcrm SD0_AHB>, <&topcrm SD0_WCLK>;
+               clock-names = "biu", "ciu";
+               num-slots = <1>;
+               max-frequency = <50000000>;
+               cap-sdio-irq;
+               cap-sd-highspeed;
+               status = "disabled";
+       };