linux-kernel - Re: [PATCH 3/6] drm/sun4i: sun8i-hdmi-phy: Used device-managed clocks/resets

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Date:   Tue, 12 Apr 2022 18:34:40 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 3/6] drm/sun4i: sun8i-hdmi-phy: Used device-managed
 clocks/resets

On 4/12/22 8:23 AM, Maxime Ripard wrote:
> Hi,
> 
> On Mon, Apr 11, 2022 at 11:35:08PM -0500, Samuel Holland wrote:
>> Now that the HDMI PHY is using a platform driver, it can use device-
>> managed resources. Use these, as well as the dev_err_probe helper, to
>> simplify the probe function and get rid of the remove function.
>>
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
>> ---
>>
>>  drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 100 ++++++++-----------------
>>  1 file changed, 30 insertions(+), 70 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
>> index 1effa30bfe62..1351e633d485 100644
>> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
>> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
>> @@ -673,10 +673,8 @@ int sun8i_hdmi_phy_get(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
>>  static int sun8i_hdmi_phy_probe(struct platform_device *pdev)
>>  {
>>  	struct device *dev = &pdev->dev;
>> -	struct device_node *node = dev->of_node;
>>  	struct sun8i_hdmi_phy *phy;
>>  	void __iomem *regs;
>> -	int ret;
>>  
>>  	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
>>  	if (!phy)
>> @@ -686,88 +684,50 @@ static int sun8i_hdmi_phy_probe(struct platform_device *pdev)
>>  	phy->dev = dev;
>>  
>>  	regs = devm_platform_ioremap_resource(pdev, 0);
>> -	if (IS_ERR(regs)) {
>> -		dev_err(dev, "Couldn't map the HDMI PHY registers\n");
>> -		return PTR_ERR(regs);
>> -	}
>> +	if (IS_ERR(regs))
>> +		return dev_err_probe(dev, PTR_ERR(regs),
>> +				     "Couldn't map the HDMI PHY registers\n");
>>  
>>  	phy->regs = devm_regmap_init_mmio(dev, regs,
>>  					  &sun8i_hdmi_phy_regmap_config);
>> -	if (IS_ERR(phy->regs)) {
>> -		dev_err(dev, "Couldn't create the HDMI PHY regmap\n");
>> -		return PTR_ERR(phy->regs);
>> -	}
>> +	if (IS_ERR(phy->regs))
>> +		return dev_err_probe(dev, PTR_ERR(phy->regs),
>> +				     "Couldn't create the HDMI PHY regmap\n");
>>  
>> -	phy->clk_bus = of_clk_get_by_name(node, "bus");
>> -	if (IS_ERR(phy->clk_bus)) {
>> -		dev_err(dev, "Could not get bus clock\n");
>> -		return PTR_ERR(phy->clk_bus);
>> -	}
>> -
>> -	phy->clk_mod = of_clk_get_by_name(node, "mod");
>> -	if (IS_ERR(phy->clk_mod)) {
>> -		dev_err(dev, "Could not get mod clock\n");
>> -		ret = PTR_ERR(phy->clk_mod);
>> -		goto err_put_clk_bus;
>> -	}
>> +	phy->clk_bus = devm_clk_get(dev, "bus");
>> +	if (IS_ERR(phy->clk_bus))
>> +		return dev_err_probe(dev, PTR_ERR(phy->clk_bus),
>> +				     "Could not get bus clock\n");
>>  
>> -	if (phy->variant->has_phy_clk) {
>> -		phy->clk_pll0 = of_clk_get_by_name(node, "pll-0");
>> -		if (IS_ERR(phy->clk_pll0)) {
>> -			dev_err(dev, "Could not get pll-0 clock\n");
>> -			ret = PTR_ERR(phy->clk_pll0);
>> -			goto err_put_clk_mod;
>> -		}
>> -
>> -		if (phy->variant->has_second_pll) {
>> -			phy->clk_pll1 = of_clk_get_by_name(node, "pll-1");
>> -			if (IS_ERR(phy->clk_pll1)) {
>> -				dev_err(dev, "Could not get pll-1 clock\n");
>> -				ret = PTR_ERR(phy->clk_pll1);
>> -				goto err_put_clk_pll0;
>> -			}
>> -		}
>> -	}
>> +	phy->clk_mod = devm_clk_get(dev, "mod");
>> +	if (IS_ERR(phy->clk_mod))
>> +		return dev_err_probe(dev, PTR_ERR(phy->clk_mod),
>> +				     "Could not get mod clock\n");
>>  
>> -	phy->rst_phy = of_reset_control_get_shared(node, "phy");
>> -	if (IS_ERR(phy->rst_phy)) {
>> -		dev_err(dev, "Could not get phy reset control\n");
>> -		ret = PTR_ERR(phy->rst_phy);
>> -		goto err_put_clk_pll1;
>> -	}
>> +	if (phy->variant->has_phy_clk)
>> +		phy->clk_pll0 = devm_clk_get(dev, "pll-0");
>> +	if (IS_ERR(phy->clk_pll0))
>> +		return dev_err_probe(dev, PTR_ERR(phy->clk_pll0),
>> +				     "Could not get pll-0 clock\n");
>> +
>> +	if (phy->variant->has_second_pll)
>> +		phy->clk_pll1 = devm_clk_get(dev, "pll-1");
>> +	if (IS_ERR(phy->clk_pll1))
>> +		return dev_err_probe(dev, PTR_ERR(phy->clk_pll1),
>> +				     "Could not get pll-1 clock\n");
>> +
>> +	phy->rst_phy = devm_reset_control_get_shared(dev, "phy");
>> +	if (IS_ERR(phy->rst_phy))
>> +		return dev_err_probe(dev, PTR_ERR(phy->rst_phy),
>> +				     "Could not get phy reset control\n");
> 
> I find the old construct clearer with the imbricated blocks.

I'm not sure what you mean here. Are you suggesting braces around the
dev_err_probe statements? Or do you want me to put the error handling for
variant-specific resources inside the variant checks? Please clarify.

Regards,
Samuel