linux-kernel - Re: [PATCH] media: Use of_property_present() for testing DT property presence

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Message-ID: <20230310150201.GK5342@pendragon.ideasonboard.com>
Date:   Fri, 10 Mar 2023 17:02:01 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Bin Liu <bin.liu@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Michal Simek <michal.simek@...inx.com>,
        devicetree@...r.kernel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] media: Use of_property_present() for testing DT property
 presence

Hi Rob,

Thank you for the patch.

On Fri, Mar 10, 2023 at 08:47:11AM -0600, Rob Herring wrote:
> It is preferred to use typed property access functions (i.e.
> of_property_read_<type> functions) rather than low-level
> of_get_property/of_find_property functions for reading properties. As
> part of this, convert of_get_property/of_find_property calls to the
> recently added of_property_present() helper when we just want to test
> for presence of a property and nothing more.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c        | 2 +-
>  drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c | 2 +-
>  drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c | 2 +-
>  drivers/media/platform/xilinx/xilinx-vtc.c                  | 2 +-
>  4 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
> index 969516a940ba..1a2b3214b6f8 100644
> --- a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
> +++ b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
> @@ -1757,7 +1757,7 @@ static int mtk_jpeg_probe(struct platform_device *pdev)
>  	jpeg->vdev->device_caps = V4L2_CAP_STREAMING |
>  				  V4L2_CAP_VIDEO_M2M_MPLANE;
>  
> -	if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL))
> +	if (of_property_present(pdev->dev.of_node, "dma-ranges"))
>  		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
>  
>  	ret = video_register_device(jpeg->vdev, VFL_TYPE_VIDEO, -1);
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c
> index 174a6eec2f54..d2db8ccaa4c0 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_drv.c
> @@ -321,7 +321,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL)) {
> +	if (of_property_present(pdev->dev.of_node, "dma-ranges")) {
>  		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
>  		if (ret) {
>  			mtk_v4l2_err("Failed to set mask");
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> index 9095186d5495..199042034a3c 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> @@ -344,7 +344,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  		goto err_event_workq;
>  	}
>  
> -	if (of_get_property(pdev->dev.of_node, "dma-ranges", NULL))
> +	if (of_property_present(pdev->dev.of_node, "dma-ranges"))
>  		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
>  
>  	ret = video_register_device(vfd_enc, VFL_TYPE_VIDEO, -1);
> diff --git a/drivers/media/platform/xilinx/xilinx-vtc.c b/drivers/media/platform/xilinx/xilinx-vtc.c
> index 0ae0208d7529..cb4b421a348d 100644
> --- a/drivers/media/platform/xilinx/xilinx-vtc.c
> +++ b/drivers/media/platform/xilinx/xilinx-vtc.c
> @@ -254,7 +254,7 @@ struct xvtc_device *xvtc_of_get(struct device_node *np)
>  	struct xvtc_device *found = NULL;
>  	struct xvtc_device *xvtc;
>  
> -	if (!of_find_property(np, "xlnx,vtc", NULL))
> +	if (!of_property_present(np, "xlnx,vtc"))
>  		return NULL;
>  
>  	xvtc_node = of_parse_phandle(np, "xlnx,vtc", 0);

-- 
Regards,

Laurent Pinchart