linux-kernel - Re: [PATCH v3 18/20] dt-bindings: qcom_nandc: IPQ8074 QPIC NAND documentation

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Date:   Fri, 11 Aug 2017 14:32:05 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     Rob Herring <robh@...nel.org>
Cc:     dwmw2@...radead.org, boris.brezillon@...e-electrons.com,
        computersforpeace@...il.com, marek.vasut@...il.com,
        mark.rutland@....com, richard@....at, cyrille.pitchen@...ev4u.fr,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        andy.gross@...aro.org, architt@...eaurora.org,
        sricharan@...eaurora.org
Subject: Re: [PATCH v3 18/20] dt-bindings: qcom_nandc: IPQ8074 QPIC NAND
 documentation

On 2017-08-11 02:00, Rob Herring wrote:
> On Sat, Aug 05, 2017 at 09:49:56PM +0530, Abhishek Sahu wrote:
>> Qualcom IPQ8074 SoC uses QPIC NAND controller version 1.5.0
>> which uses BAM DMA Engine.
>> 
>> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/mtd/qcom_nandc.txt | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>> 
>> diff --git a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt 
>> b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
>> index d93b952..8dfa543 100644
>> --- a/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
>> +++ b/Documentation/devicetree/bindings/mtd/qcom_nandc.txt
>> @@ -6,6 +6,8 @@ Required properties:
>>  			    SoC and it uses ADM DMA
>>      * "qcom,ipq4019-nand" - for QPIC NAND controller v1.4.0 being 
>> used in
>>                              IPQ4019 SoC and it uses BAM DMA
>> +    * "qcom,ipq8074-nand" - for QPIC NAND controller v1.5.0 being 
>> used in
>> +                            IPQ8074 SoC and it uses BAM DMA
>> 
>>  - reg:			MMIO address range
>>  - clocks:		must contain core clock and always on clock
>> @@ -97,7 +99,7 @@ nand-controller@...00000 {
>>  };
>> 
>>  nand-controller@...0000 {
>> -	compatible = "qcom,ipq4019-nand";
>> +	compatible = "qcom,ipq4019-nand", "qcom,ipq8074-nand";
> 
> The order here should be reversed as 8074 is the newer one. And if 4019
> is the fallback compatible, that needs to be documented above.
> 

  Thanks Rob for review.

  This is not fallback compatible. I checked the other device tree
  binding examples and it seems, we don't have to add every
  similar compatible string in example. I will remove the
  qcom,ipq8074-nand from example which is causing confusion.

> Rob