linux-kernel - Re: [PATCH 2/5] dmaengine: qcom: gpi: document preferred SM6350 binding

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Date:   Mon, 17 Oct 2022 18:12:22 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Richard Acayan <mailingradian@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Melody Olvera <quic_molvera@...cinc.org>
Subject: Re: [PATCH 2/5] dmaengine: qcom: gpi: document preferred SM6350
 binding

On 17/10/2022 18:00, Richard Acayan wrote:
>> On 17/10/2022 17:23, Richard Acayan wrote:
>>>> Devices with ee offset of 0x10000 should rather bind with SM6350
>>>> compatible, so the list will not unnecessarily grow for compatible
>>>> devices.
>>>>
>>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>> ---
>>>>  drivers/dma/qcom/gpi.c | 7 ++++---
>>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c
>>>> index f8e19e6e6117..061add832295 100644
>>>> --- a/drivers/dma/qcom/gpi.c
>>>> +++ b/drivers/dma/qcom/gpi.c
>>>> @@ -2286,13 +2286,14 @@ static int gpi_probe(struct platform_device *pdev)
>>>>  }
>>>>  
>>>>  static const struct of_device_id gpi_of_match[] = {
>>>> -	{ .compatible = "qcom,sc7280-gpi-dma", .data = (void *)0x10000 },
>>>>  	{ .compatible = "qcom,sdm845-gpi-dma", .data = (void *)0x0 },
>>>>  	{ .compatible = "qcom,sm6350-gpi-dma", .data = (void *)0x10000 },
>>>>  	/*
>>>> -	 * Deprecated, devices with ee_offset = 0 should use sdm845-gpi-dma as
>>>> -	 * fallback and not need their own entries here.
>>>
>>> This comment is from the dependency series [1]. Why would we need to add it just
>>> to remove it here? I was not notified that the dependency was applied anywhere
>>> (except as a base for other series) so it's not set in stone. Let's just drop
>>> the original patch that this comment originates from to prevent needlessly
>>> adding and removing the same lines at once.
>>
>> I don't remove the comment, I re-phrase it to be better suited for final
>> code.
> 
> Yes, I didn't word that exactly right. I still think the patch that adds this is
> now useless if it's just going to be replaced. Do you think I should keep the
> patch that this comment originates from, even though we already know exactly how
> its substantial contents will be replaced?
> 
> We can't modify history and drop commits on kernel trees, but I can still send
> a v6 series that drops the original comment.

Sure. You can make it then:

	 * Do not grow the list for compatible devices. Instead use
	 * qcom,sdm845-gpi-dma (for ee_offset = 0x0).

And my patch will just change one line.

We can also keep it like:

	 * Do not grow the list for compatible devices. Instead use
	 * proper fallback compatibles.

Best regards,
Krzysztof