Re: [PATCH V5] ARM: dts: Add dwmmc DT nodes for exynos5420 SOC

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On Wed, Aug 28, 2013 at 5:52 PM, Tomasz Figa <t.figa@xxxxxxxxxxx> wrote:
> Hi Yuvaraj,
>
> On Wednesday 28 of August 2013 17:33:06 Yuvaraj Kumar C D wrote:
>> This patch adds the device tree node entries for exynos5420 SOC.
>> Exynos5420 has a different version of DWMMC controller,so a new
>> compatible string is used to distinguish it from the prior SOC's.
>>
>> This patch depends on
>>       mmc: dw_mmc: exynos: Add a new compatible string for exynos5420
>>
>> changes since v4:
>>       1.Droppped the bypass-smu binding property.
>>       2.Used compatible string "samsung,exynos5250-dw-mshc"
>>         for controller instance which does not have SMU.
>>
>> changes since V3:
>>       1.change fifo-depth size from 0x80 to 0x40
>>       2.Move the below properties
>>               a.card-detect-delay
>>               b.samsung,dw-mshc-ciu-div
>>               c.samsung,dw-mshc-sdr-timing
>>               d.samsung,dw-mshc-ddr-timing
>>       from SOC dts to board dts file as suggested by Doug Anderson
>>
>> changes since V2:
>>       1.dropped num-slots property from node as its not required
>>         if number of card slots available is 1.
>>
>>       2.Move the below properties
>>               a.fifo-depth
>>               b.card-detect-delay
>>               c.samsung,dw-mshc-ciu-div
>>               d.samsung,dw-mshc-sdr-timing
>>               e.samsung,dw-mshc-ddr-timing
>>       from board dts to SOC dts,as these are not board specific properties.
>>
>>       3.Updated the binding document exynos-dw-mshc.txt.
>>
>> changes since V1:
>>       1.disable node by status = disabled in SOC file
>>       2.enable node by status = okay in board specific file
>>
>> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@xxxxxxxxxxx>
>> ---
>>  .../devicetree/bindings/mmc/exynos-dw-mshc.txt     |    2 +
>>  arch/arm/boot/dts/exynos5420-smdk5420.dts          |   33
>> +++++++++++++++++ arch/arm/boot/dts/exynos5420.dtsi                  |
>> 39 ++++++++++++++++++++ 3 files changed, 74 insertions(+)
>
> This patch looks good to me now, except some minor comments below.
>
>> diff --git a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
>> b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt index
>> 6d1c098..84cd56f 100644
>> --- a/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
>> +++ b/Documentation/devicetree/bindings/mmc/exynos-dw-mshc.txt
>> @@ -16,6 +16,8 @@ Required Properties:
>>         specific extensions.
>>       - "samsung,exynos5250-dw-mshc": for controllers with Samsung Exynos5250
>> specific extensions.
>> +     - "samsung,exynos5420-dw-mshc": for controllers with Samsung Exynos5420
>> +       specific extensions.
>>
>>  * samsung,dw-mshc-ciu-div: Specifies the divider value for the card
>> interface unit (ciu) clock. This property is applicable only for Exynos5
>> SoC's and diff --git a/arch/arm/boot/dts/exynos5420-smdk5420.dts
>> b/arch/arm/boot/dts/exynos5420-smdk5420.dts index bafba25..3ce5c97
>> 100644
>> --- a/arch/arm/boot/dts/exynos5420-smdk5420.dts
>> +++ b/arch/arm/boot/dts/exynos5420-smdk5420.dts
>> @@ -31,6 +31,39 @@
>>               };
>>       };
>>
>> +     dwmmc0@12200000 {
>
> Node name should not contain instance index. Instead, according to ePAPR
> recommendation, I would opt for a generic name such as mmc, mshc or sdio-
> host. mshc is already used on Exynos 4 so it might be a good idea to use it
> for consistency.
If we change node name's to mshc, debug statements are look like below:
dwmmc_exynos 12200000.mshc: num-slots property not found, assuming 1
slot is available
dwmmc_exynos 12200000.mshc: no vmmc regulator found: -19
dwmmc_exynos 12200000.mshc: Using internal DMA controller.
dwmmc_exynos 12200000.mshc: Version ID is 250a
dwmmc_exynos 12200000.mshc: DW MMC controller at irq 107, 64 bit host
data width, 64 deep fifo

"dwmmc_exynos" is platform driver name and "12200000.mshc" from dt
node.Is'nt it look like bit confusing?

>
> [Adding DT maintainers on CC]
>
> Best regards,
> Tomasz
>
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