Re: [PATCH v1 2/3] clk: starfive: Add StarFive JH7110 PLL clock driver

[Xingyu Wu]

On 2023/2/23 16:56, Krzysztof Kozlowski wrote:
> On 21/02/2023 15:11, Xingyu Wu wrote:
>> Add driver for the StarFive JH7110 PLL clock controller and
>> modify the JH7110 system clock driver to rely on this PLL clocks.
>> 
>> Signed-off-by: Xingyu Wu <xingyu.wu@xxxxxxxxxxxxxxxx>
>> ---
> 
> 
>> +
>> +static int jh7110_pll_clk_probe(struct platform_device *pdev)
>> +{
>> +	int ret;
>> +	struct of_phandle_args args;
>> +	struct regmap *pll_syscon_regmap;
>> +	unsigned int idx;
>> +	struct jh7110_clk_pll_priv *priv;
>> +	struct jh7110_clk_pll_data *data;
>> +	char *pll_name[JH7110_PLLCLK_END] = {
>> +		"pll0_out",
>> +		"pll1_out",
>> +		"pll2_out"
>> +	};
>> +
>> +	priv = devm_kzalloc(&pdev->dev,
>> +			    struct_size(priv, data, JH7110_PLLCLK_END),
>> +			    GFP_KERNEL);
>> +	if (!priv)
>> +		return -ENOMEM;
>> +
>> +	priv->dev = &pdev->dev;
>> +	ret = of_parse_phandle_with_fixed_args(pdev->dev.of_node, "starfive,sysreg", 0, 0, &args);
> 
> 1. Wrong wrapping. Wrap code at 80 as coding style asks.
> 
> 2. Why you are using syscon for normal, device MMIO operation? Your DTS
> also points that this is incorrect, hacky representation of hardware.
> Don't add devices to DT to fake places and then overuse syscon to fix
> that fake placement. The clock is in system registers, thus it must be
> there.
> 
> 3. Even if this stays, why so complicated code instead of
> syscon_regmap_lookup_by_phandle()?
> 

Thanks for your advice. Will use syscon_regmap_lookup_by_phandle instead it
and remove useless part.

> 
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Failed to parse starfive,sys-syscon : %d\n", ret);
> 
> dev_err_probe and in other places as well, if applicable.

Will drop.

Best regards,
Xingyu Wu