linux-kernel - Re: [PATCH v5, 24/32] drm/mediatek: add clock property check before get it

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Message-ID: <1567145502.5942.15.camel@mtksdaap41>
Date:   Fri, 30 Aug 2019 14:11:42 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <yongqiang.niu@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v5, 24/32] drm/mediatek: add clock property check before
 get it

Hi, Yongqiang:

On Thu, 2019-08-29 at 22:50 +0800, yongqiang.niu@...iatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@...iatek.com>
> 
> This patch add clock property check before get it
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index a5a6689..effc24a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -657,10 +657,12 @@ static int mtk_ddp_probe(struct platform_device *pdev)
>  	for (i = 0; i < 10; i++)
>  		ddp->mutex[i].id = i;
>  
> -	ddp->clk = devm_clk_get(dev, NULL);
> -	if (IS_ERR(ddp->clk)) {
> -		dev_err(dev, "Failed to get clock\n");
> -		return PTR_ERR(ddp->clk);
> +	if (of_find_property(dev->of_node, "clocks", &i)) {
> +		ddp->clk = devm_clk_get(dev, NULL);
> +		if (IS_ERR(ddp->clk)) {
> +			dev_err(dev, "Failed to get clock\n");
> +			return PTR_ERR(ddp->clk);
> +		}

Only "mediatek,mt8133-disp-mutex" has no clock property. For other SoC,
clock property is required. So I think this exception is just for
mt8183.

Regards,
CK

>  	}
>  
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);