2016-11-14 15:58 GMT+08:00 Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>:
> On 2016/11/8 9:24, Jun Nie wrote:
>>
>> Document the device-tree binding of ZTE MMC host on
>> ZX296718 SoC.
>>
>> Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
>> ---
>> .../devicetree/bindings/mmc/zx-dw-mshc.txt | 35
>> ++++++++++++++++++++++
>> 1 file changed, 35 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt
>> b/Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt
>> new file mode 100644
>> index 0000000..c175c4b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mmc/zx-dw-mshc.txt
>> @@ -0,0 +1,35 @@
>> +* 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";
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + 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>;
>
>
> do you need both clock-frequency and max-frequency here?
According to dts document, clock-frequency is for clock configuration
when dw core probe. max-frequency is for mmc core to limit max
frequency for any cards at any time. Do you have any suggestion? Thank
you for your time!
>
>> + 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";
>> + };
>>
>
>
> --
> Best Regards
> Shawn Lin
>
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