linux-kernel - Re: [PATCH V1 1/7] dt-bindings: mmc: Add information for DLL register properties

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Date:   Tue, 19 May 2020 19:30:01 +0530
From:   sartgarg@...eaurora.org
To:     Rob Herring <robh@...nel.org>
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        vbadigan@...eaurora.org, stummala@...eaurora.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-mmc-owner@...r.kernel.org
Subject: Re: [PATCH V1 1/7] dt-bindings: mmc: Add information for DLL register
 properties

On 2020-05-15 08:20, Rob Herring wrote:
> On Thu, May 07, 2020 at 01:32:08PM +0530, Sarthak Garg wrote:
>> Add information regarding DLL register properties for getting target
>> specific configurations. These DLL register settings may vary from
>> target to target.
>> 
>> Also new compatible string value for sm8250 target.
>> 
>> Signed-off-by: Sarthak Garg <sartgarg@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 14 
>> ++++++++++++++
>>  1 file changed, 14 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt 
>> b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
>> index 5445931..b8e1d2b 100644
>> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
>> @@ -17,6 +17,7 @@ Required properties:
>>  		"qcom,msm8916-sdhci", "qcom,sdhci-msm-v4"
>>  		"qcom,msm8992-sdhci", "qcom,sdhci-msm-v4"
>>  		"qcom,msm8996-sdhci", "qcom,sdhci-msm-v4"
>> +		"qcom,sm8250-sdhci", "qcom,sdhci-msm-v5"
>>  		"qcom,sdm845-sdhci", "qcom,sdhci-msm-v5"
>>  		"qcom,qcs404-sdhci", "qcom,sdhci-msm-v5"
>>  		"qcom,sc7180-sdhci", "qcom,sdhci-msm-v5";
>> @@ -46,6 +47,13 @@ Required properties:
>>  	"cal"	- reference clock for RCLK delay calibration (optional)
>>  	"sleep"	- sleep clock for RCLK delay calibration (optional)
>> 
>> +- qcom,ddr-config: Certain chipsets and platforms require particular 
>> settings
>> +	for the DDR_CONFIG register. Use this field to specify the register
>> +	value as per the Hardware Programming Guide.
>> +
>> +- qcom,dll-config: Chipset and Platform specific value. Use this 
>> field to
>> +	specify the DLL_CONFIG register value as per Hardware Programming 
>> Guide.
> 
> Board specific or SoC specific? If the latter, imply this from the
> compatible string.

Reposting again as can't find my comment on the 
https://patchwork.kernel.org/ page.
Whatever DLL settings are SOC specific are being taken care with the 
compatible string.
That is the reason we introduced qcom,sm8250-sdhci string.
The above listed two configuration can change from board to board 
as-well.