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

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Date:   Mon, 17 Oct 2022 17:23:20 -0400
From:   Richard Acayan <mailingradian@...il.com>
To:     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:     Richard Acayan <mailingradian@...il.com>,
        Melody Olvera <quic_molvera@...cinc.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH 2/5] dmaengine: qcom: gpi: document preferred SM6350 binding

> 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.

[1] https://lore.kernel.org/linux-arm-msm/20221007213640.85469-4-mailingradian@gmail.com/

> +	 * Do not grow the list for compatible devices. Instead use
> +	 * qcom,sdm845-gpi-dma (for ee_offset = 0x0) or qcom,sm6350-gpi-dma
> +	 * (for ee_offset = 0x10000).
>  	 */
> +	{ .compatible = "qcom,sc7280-gpi-dma", .data = (void *)0x10000 },
>  	{ .compatible = "qcom,sm8150-gpi-dma", .data = (void *)0x0 },
>  	{ .compatible = "qcom,sm8250-gpi-dma", .data = (void *)0x0 },
>  	{ .compatible = "qcom,sm8350-gpi-dma", .data = (void *)0x10000 },
> -- 
> 2.34.1
>