linux-kernel - Re: [PATCH 3/3] phy: mediatek: phy-mtk-mipi-dsi: Simplify with dev_err

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Date:   Thu, 6 Jan 2022 17:13:43 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <chunkuang.hu@...nel.org>
CC:     <p.zabel@...gutronix.de>, <kishon@...com>, <vkoul@...nel.org>,
        <matthias.bgg@...il.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] phy: mediatek: phy-mtk-mipi-dsi: Simplify with
 dev_err_probe()

On Mon, 2022-01-03 at 15:53 +0100, AngeloGioacchino Del Regno wrote:
> Use the dev_err_probe() helper to simplify error handling during
> probe.
> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---
>  drivers/phy/mediatek/phy-mtk-mipi-dsi.c | 29 +++++++++------------
> ----
>  1 file changed, 10 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> index 6f7425b0bf5b..4b77508f5241 100644
> --- a/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> +++ b/drivers/phy/mediatek/phy-mtk-mipi-dsi.c
> @@ -148,11 +148,9 @@ static int mtk_mipi_tx_probe(struct
> platform_device *pdev)
>  		return PTR_ERR(mipi_tx->regmap);
>  
>  	ref_clk = devm_clk_get(dev, NULL);
> -	if (IS_ERR(ref_clk)) {
> -		ret = PTR_ERR(ref_clk);
> -		dev_err(dev, "Failed to get reference clock: %d\n",
> ret);
> -		return ret;
> -	}
> +	if (IS_ERR(ref_clk))
> +		return dev_err_probe(dev, PTR_ERR(ref_clk),
> +				     "Failed to get reference
> clock\n");
>  
>  	ret = of_property_read_u32(dev->of_node, "drive-strength-
> microamp",
>  				   &mipi_tx->mipitx_drive);
> @@ -172,27 +170,20 @@ static int mtk_mipi_tx_probe(struct
> platform_device *pdev)
>  
>  	ret = of_property_read_string(dev->of_node, "clock-output-
> names",
>  				      &clk_init.name);
> -	if (ret < 0) {
> -		dev_err(dev, "Failed to read clock-output-names: %d\n",
> ret);
> -		return ret;
> -	}
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to read clock-
> output-names\n");
Seems no need change it here. (no EPROBE_DEFER error)

Thanks
>  
>  	clk_init.ops = mipi_tx->driver_data->mipi_tx_clk_ops;
>  
>  	mipi_tx->pll_hw.init = &clk_init;
>  	mipi_tx->pll = devm_clk_register(dev, &mipi_tx->pll_hw);
> -	if (IS_ERR(mipi_tx->pll)) {
> -		ret = PTR_ERR(mipi_tx->pll);
> -		dev_err(dev, "Failed to register PLL: %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(mipi_tx->pll))
> +		return dev_err_probe(dev, PTR_ERR(mipi_tx->pll),
> "Cannot register PLL\n");
>  
>  	phy = devm_phy_create(dev, NULL, &mtk_mipi_tx_ops);
> -	if (IS_ERR(phy)) {
> -		ret = PTR_ERR(phy);
> -		dev_err(dev, "Failed to create MIPI D-PHY: %d\n", ret);
> -		return ret;
> -	}
> +	if (IS_ERR(phy))
> +		return dev_err_probe(dev, PTR_ERR(phy), "Failed to
> create MIPI D-PHY\n");
> +
>  	phy_set_drvdata(phy, mipi_tx);
>  
>  	phy_provider = devm_of_phy_provider_register(dev,
> of_phy_simple_xlate);