linux-kernel - Re: [PATCH v4 4/4] remoteproc: mediatek: Support mt8195 scp

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Date:   Fri, 30 Jul 2021 10:58:06 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Tinghan Shen <tinghan.shen@...iatek.com>
Cc:     ohad@...ery.com, mathieu.poirier@...aro.org, robh+dt@...nel.org,
        matthias.bgg@...il.com, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        srv_heupstream@...iatek.com, tzungbi@...gle.com,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v4 4/4] remoteproc: mediatek: Support mt8195 scp

On Tue 27 Jul 22:58 CDT 2021, Tinghan Shen wrote:

> The SCP clock design is changed on mt8195 that doesn't need to control
> SCP clock on kernel side.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> ---
>  drivers/remoteproc/mtk_scp.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index 9679cc26895e..250cb946ea37 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -785,7 +785,7 @@ static int scp_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto destroy_mutex;
>  
> -	scp->clk = devm_clk_get(dev, "main");
> +	scp->clk = devm_clk_get_optional(dev, "main");

This makes the clock optional for mt8183 and mt8192 as well.

How about using mtk_scp_of_data to denote if the clock should be
acquired?

Regards,
Bjorn

>  	if (IS_ERR(scp->clk)) {
>  		dev_err(dev, "Failed to get clock\n");
>  		ret = PTR_ERR(scp->clk);
> @@ -877,6 +877,7 @@ static const struct mtk_scp_of_data mt8192_of_data = {
>  static const struct of_device_id mtk_scp_of_match[] = {
>  	{ .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
>  	{ .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
> +	{ .compatible = "mediatek,mt8195-scp", .data = &mt8192_of_data },
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
> -- 
> 2.18.0
>