From: tianshuliang <tianshuliang@xxxxxxxxxxxxx>
Hisilicon hi3798cv200 SoC extends the dw-mshc controller
for additional clock control. Add device tree bindings for
hi3798cv200-dw-mshc.
Signed-off-by: tianshuliang <tianshuliang@xxxxxxxxxxxxx>
Signed-off-by: Jiancheng Xue <xuejiancheng@xxxxxxxxxxxxx>
---
.../bindings/mmc/hi3798cv200-dw-mshc.txt | 51 ++++++++++++++++++++++
1 file changed, 51 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mmc/hi3798cv200-dw-mshc.txt
diff --git a/Documentation/devicetree/bindings/mmc/hi3798cv200-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/hi3798cv200-dw-mshc.txt
new file mode 100644
index 0000000..845c32c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/hi3798cv200-dw-mshc.txt
@@ -0,0 +1,51 @@
+* Hisilicon specific extensions to the Synopsys Designware Mobile
+ Storage Host Controller
+
+Read synopsys-dw-mshc.txt for more details
+
+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 Hisilicon specific
+extensions to the Synopsys Designware Mobile Storage Host Controller.
+
+Required Properties:
+
+* compatible: should be one of the following.
+ - "hisilicon,hi3798cv200-dw-mshc": for controllers with hi3798cv200 specific extensions.
+
+Optional Properties:
+* clocks: from common clock binding: if ciu-drive and ciu-sample are
+ specified in clock-names, should contain handles to these clocks.
+
+* clock-names:Apart from the clock-names described in synopsys-dw-mshc.txt
+ two more clocks "ciu-drive" and "ciu-sample" are supported. They are used
+ to control the clock phases, "ciu-sample" is required for tuning high-speed modes.
+
+Example:
+
+ /* for Hi3798cv200 */
+
+ /* SoC portion */
+ emmc: mmc@9830000 {
+ compatible = "hisilicon,hi3798cv200-dw-mshc";
+ reg = <0x9830000 0x10000>;
+ interrupts = <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&crg HISTB_MMC_CIU_CLK>,
+ <&crg HISTB_MMC_BIU_CLK>,
+ <&crg HISTB_MMC_SAMPLE_CLK>;
+ clock-names = "ciu", "biu", "ciu-sample";
+ };
+
+ /* Board portion */
+ &emmc {
+ status = "okay";
+ num-slots = <1>;
+ fifo-depth = <256>;
+ clock-frequency = <200000000>;
+ cap-mmc-highspeed;
+ mmc-ddr-1_8v;
+ mmc-hs200-1_8v;
+ non-removable;
+ bus-width = <8>;
+ };
--
2.7.4
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