Re: [PATCH 10/11] usb: dwc3: dwc3-octeon: Move node parsing into driver probe

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On Mon, Jun 19, 2023, Ladislav Michl wrote:
> From: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
> 
> Make dwc3_octeon_clocks_start just start the clocks.
> 
> Signed-off-by: Ladislav Michl <ladis@xxxxxxxxxxxxxx>
> ---
>  drivers/usb/dwc3/dwc3-octeon.c | 150 ++++++++++++++++-----------------
>  1 file changed, 71 insertions(+), 79 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-octeon.c b/drivers/usb/dwc3/dwc3-octeon.c
> index 3ebcf2a61233..4ad2d8887cf0 100644
> --- a/drivers/usb/dwc3/dwc3-octeon.c
> +++ b/drivers/usb/dwc3/dwc3-octeon.c
> @@ -295,67 +295,14 @@ static int dwc3_octeon_config_power(struct device *dev, void __iomem *base)
>  	return 0;
>  }
>  
> -static int dwc3_octeon_clocks_start(struct device *dev, void __iomem *base)
> +static int dwc3_octeon_clocks_start(struct device *dev, void __iomem *base,
> +				    int ref_clk_sel, int ref_clk_fsel,
> +				    int mpll_mul)
>  {
> -	int i, div, mpll_mul, ref_clk_fsel, ref_clk_sel = 2;
> -	u32 clock_rate;
> +	int div;
>  	u64 val;
>  	void __iomem *uctl_ctl_reg = base + USBDRD_UCTL_CTL;
>  
> -	if (dev->of_node) {
> -		const char *ss_clock_type;
> -		const char *hs_clock_type;
> -
> -		i = of_property_read_u32(dev->of_node,
> -					 "refclk-frequency", &clock_rate);
> -		if (i) {
> -			dev_err(dev, "No UCTL \"refclk-frequency\"\n");
> -			return -EINVAL;
> -		}
> -		i = of_property_read_string(dev->of_node,
> -					    "refclk-type-ss", &ss_clock_type);
> -		if (i) {
> -			dev_err(dev, "No UCTL \"refclk-type-ss\"\n");
> -			return -EINVAL;
> -		}
> -		i = of_property_read_string(dev->of_node,
> -					    "refclk-type-hs", &hs_clock_type);
> -		if (i) {
> -			dev_err(dev, "No UCTL \"refclk-type-hs\"\n");
> -			return -EINVAL;
> -		}
> -		if (strcmp("dlmc_ref_clk0", ss_clock_type) == 0) {
> -			if (strcmp(hs_clock_type, "dlmc_ref_clk0") == 0)
> -				ref_clk_sel = 0;
> -			else if (strcmp(hs_clock_type, "pll_ref_clk") == 0)
> -				ref_clk_sel = 2;
> -			else
> -				dev_warn(dev, "Invalid HS clock type %s, using pll_ref_clk instead\n",
> -					 hs_clock_type);
> -		} else if (strcmp(ss_clock_type, "dlmc_ref_clk1") == 0) {
> -			if (strcmp(hs_clock_type, "dlmc_ref_clk1") == 0)
> -				ref_clk_sel = 1;
> -			else if (strcmp(hs_clock_type, "pll_ref_clk") == 0)
> -				ref_clk_sel = 3;
> -			else {
> -				dev_warn(dev, "Invalid HS clock type %s, using pll_ref_clk instead\n",
> -					 hs_clock_type);
> -				ref_clk_sel = 3;
> -			}
> -		} else
> -			dev_warn(dev, "Invalid SS clock type %s, using dlmc_ref_clk0 instead\n",
> -				 ss_clock_type);
> -
> -		if ((ref_clk_sel == 0 || ref_clk_sel == 1) &&
> -		    (clock_rate != 100000000))
> -			dev_warn(dev, "Invalid UCTL clock rate of %u, using 100000000 instead\n",
> -				 clock_rate);
> -
> -	} else {
> -		dev_err(dev, "No USB UCTL device node\n");
> -		return -EINVAL;
> -	}
> -
>  	/*
>  	 * Step 1: Wait for all voltages to be stable...that surely
>  	 *         happened before starting the kernel. SKIP
> @@ -399,24 +346,6 @@ static int dwc3_octeon_clocks_start(struct device *dev, void __iomem *base)
>  	val &= ~USBDRD_UCTL_CTL_REF_CLK_SEL;
>  	val |= FIELD_PREP(USBDRD_UCTL_CTL_REF_CLK_SEL, ref_clk_sel);
>  
> -	ref_clk_fsel = 0x07;
> -	switch (clock_rate) {
> -	default:
> -		dev_warn(dev, "Invalid ref_clk %u, using 100000000 instead\n",
> -			 clock_rate);
> -		fallthrough;
> -	case 100000000:
> -		mpll_mul = 0x19;
> -		if (ref_clk_sel < 2)
> -			ref_clk_fsel = 0x27;
> -		break;
> -	case 50000000:
> -		mpll_mul = 0x32;
> -		break;
> -	case 125000000:
> -		mpll_mul = 0x28;
> -		break;
> -	}
>  	val &= ~USBDRD_UCTL_CTL_REF_CLK_FSEL;
>  	val |= FIELD_PREP(USBDRD_UCTL_CTL_REF_CLK_FSEL, ref_clk_fsel);
>  
> @@ -502,8 +429,72 @@ static void __init dwc3_octeon_phy_reset(void __iomem *base)
>  static int dwc3_octeon_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> +	struct device_node *node = dev->of_node;
>  	struct dwc3_data *data;
> -	int err;
> +	int err, ref_clk_sel, ref_clk_fsel, mpll_mul;
> +	uint32_t clock_rate;
> +	const char *hs_clock_type, *ss_clock_type;
> +
> +	if (!node) {
> +		dev_err(dev, "No USB UCTL device node\n");
> +		return -EINVAL;
> +	}
> +
> +	if (of_property_read_u32(node, "refclk-frequency", &clock_rate)) {
> +		dev_err(dev, "No UCTL \"refclk-frequency\"\n");
> +		return -EINVAL;
> +	}
> +	if (of_property_read_string(node, "refclk-type-ss", &ss_clock_type)) {
> +		dev_err(dev, "No UCTL \"refclk-type-ss\"\n");
> +		return -EINVAL;
> +	}
> +	if (of_property_read_string(node, "refclk-type-hs", &hs_clock_type)) {
> +		dev_err(dev, "No UCTL \"refclk-type-hs\"\n");
> +		return -EINVAL;
> +	}
> +
> +	ref_clk_sel = 2;

Can we use macro instead of magic numbers?

> +	if (strcmp("dlmc_ref_clk0", ss_clock_type) == 0) {
> +		if (strcmp(hs_clock_type, "dlmc_ref_clk0") == 0)
> +			ref_clk_sel = 0;
> +		else if (strcmp(hs_clock_type, "pll_ref_clk") == 0)
> +			ref_clk_sel = 2;
> +		else
> +			dev_warn(dev, "Invalid HS clock type %s, using pll_ref_clk instead\n",
> +				 hs_clock_type);
> +	} else if (strcmp(ss_clock_type, "dlmc_ref_clk1") == 0) {
> +		if (strcmp(hs_clock_type, "dlmc_ref_clk1") == 0)
> +			ref_clk_sel = 1;
> +		else if (strcmp(hs_clock_type, "pll_ref_clk") == 0)
> +			ref_clk_sel = 3;

Please run checkpatch and fix minor formatting issues such as bracket
here.

> +		else {
> +			dev_warn(dev, "Invalid HS clock type %s, using pll_ref_clk instead\n",
> +				 hs_clock_type);
> +			ref_clk_sel = 3;
> +		}
> +	} else {
> +		dev_warn(dev, "Invalid SS clock type %s, using dlmc_ref_clk0 instead\n",
> +			 ss_clock_type);
> +	}
> +
> +	ref_clk_fsel = 0x07;
> +	switch (clock_rate) {
> +	default:
> +		dev_warn(dev, "Invalid ref_clk %u, using 100000000 instead\n",
> +			 clock_rate);
> +		fallthrough;
> +	case 100000000:
> +		mpll_mul = 0x19;
> +		if (ref_clk_sel < 2)
> +			ref_clk_fsel = 0x27;
> +		break;
> +	case 50000000:
> +		mpll_mul = 0x32;
> +		break;
> +	case 125000000:
> +		mpll_mul = 0x28;
> +		break;
> +	}
>  
>  	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
>  	if (!data)
> @@ -516,7 +507,8 @@ static int dwc3_octeon_probe(struct platform_device *pdev)
>  	if (IS_ERR(data->base))
>  		return PTR_ERR(data->base);
>  
> -	err = dwc3_octeon_clocks_start(dev, data->base);
> +	err = dwc3_octeon_clocks_start(dev, data->base,
> +				       ref_clk_sel, ref_clk_fsel, mpll_mul);
>  	if (err)
>  		return err;
>  
> -- 
> 2.39.2
> 

Thanks,
Thinh




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