linux-kernel - Re: [PATCH V2 1/5] clk: qcom: apss-ipq-pll: refactor the driver to accommodate different PLL types

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Message-ID: <e4b9cfd0-4616-b2b1-5da6-63d811109d67@linaro.org>
Date:   Wed, 8 Feb 2023 09:43:21 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Kathiravan T <quic_kathirav@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        jassisinghbrar@...il.com, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_varada@...cinc.com, quic_srichara@...cinc.com
Subject: Re: [PATCH V2 1/5] clk: qcom: apss-ipq-pll: refactor the driver to
 accommodate different PLL types



On 8.02.2023 05:28, Kathiravan T wrote:
> APSS PLL found on the IPQ8074 and IPQ6018 are of type Huayra PLL. But,
> IPQ5332 APSS PLL is of type Stromer Plus. To accommodate both these PLLs,
> refactor the driver to take the clk_alpha_pll, alpha_pll_config via driver
> data.
> 
> Signed-off-by: Kathiravan T <quic_kathirav@...cinc.com>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
> Changes in V2:
> 	- Added a comment to describe why different offsets are required
> 	  for PLL
> 
>  drivers/clk/qcom/apss-ipq-pll.c | 60 ++++++++++++++++++++++-----------
>  1 file changed, 41 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
> index a5aea27eb867..4f2a147e9fb2 100644
> --- a/drivers/clk/qcom/apss-ipq-pll.c
> +++ b/drivers/clk/qcom/apss-ipq-pll.c
> @@ -8,20 +8,27 @@
>  
>  #include "clk-alpha-pll.h"
>  
> -static const u8 ipq_pll_offsets[] = {
> -	[PLL_OFF_L_VAL] = 0x08,
> -	[PLL_OFF_ALPHA_VAL] = 0x10,
> -	[PLL_OFF_USER_CTL] = 0x18,
> -	[PLL_OFF_CONFIG_CTL] = 0x20,
> -	[PLL_OFF_CONFIG_CTL_U] = 0x24,
> -	[PLL_OFF_STATUS] = 0x28,
> -	[PLL_OFF_TEST_CTL] = 0x30,
> -	[PLL_OFF_TEST_CTL_U] = 0x34,
> +/*
> + * Even though APSS PLL type is of existing one (like Huayra), its offsets
> + * are different from the one mentioned in the clk-alpha-pll.c, since the
> + * PLL is specific to APSS, so lets the define the same.
> + */
> +static const u8 ipq_pll_offsets[][PLL_OFF_MAX_REGS] = {
> +	[CLK_ALPHA_PLL_TYPE_HUAYRA] =  {
> +		[PLL_OFF_L_VAL] = 0x08,
> +		[PLL_OFF_ALPHA_VAL] = 0x10,
> +		[PLL_OFF_USER_CTL] = 0x18,
> +		[PLL_OFF_CONFIG_CTL] = 0x20,
> +		[PLL_OFF_CONFIG_CTL_U] = 0x24,
> +		[PLL_OFF_STATUS] = 0x28,
> +		[PLL_OFF_TEST_CTL] = 0x30,
> +		[PLL_OFF_TEST_CTL_U] = 0x34,
> +	},
>  };
>  
> -static struct clk_alpha_pll ipq_pll = {
> +static struct clk_alpha_pll ipq_pll_huayra = {
>  	.offset = 0x0,
> -	.regs = ipq_pll_offsets,
> +	.regs = ipq_pll_offsets[CLK_ALPHA_PLL_TYPE_HUAYRA],
>  	.flags = SUPPORTS_DYNAMIC_UPDATE,
>  	.clkr = {
>  		.enable_reg = 0x0,
> @@ -61,6 +68,21 @@ static const struct alpha_pll_config ipq8074_pll_config = {
>  	.test_ctl_hi_val = 0x4000,
>  };
>  
> +struct apss_pll_data {
> +	struct clk_alpha_pll *pll;
> +	const struct alpha_pll_config *pll_config;
> +};
> +
> +static struct apss_pll_data ipq8074_pll_data = {
> +	.pll = &ipq_pll_huayra,
> +	.pll_config = &ipq8074_pll_config,
> +};
> +
> +static struct apss_pll_data ipq6018_pll_data = {
> +	.pll = &ipq_pll_huayra,
> +	.pll_config = &ipq6018_pll_config,
> +};
> +
>  static const struct regmap_config ipq_pll_regmap_config = {
>  	.reg_bits		= 32,
>  	.reg_stride		= 4,
> @@ -71,7 +93,7 @@ static const struct regmap_config ipq_pll_regmap_config = {
>  
>  static int apss_ipq_pll_probe(struct platform_device *pdev)
>  {
> -	const struct alpha_pll_config *ipq_pll_config;
> +	const struct apss_pll_data *data;
>  	struct device *dev = &pdev->dev;
>  	struct regmap *regmap;
>  	void __iomem *base;
> @@ -85,23 +107,23 @@ static int apss_ipq_pll_probe(struct platform_device *pdev)
>  	if (IS_ERR(regmap))
>  		return PTR_ERR(regmap);
>  
> -	ipq_pll_config = of_device_get_match_data(&pdev->dev);
> -	if (!ipq_pll_config)
> +	data = of_device_get_match_data(&pdev->dev);
> +	if (!data)
>  		return -ENODEV;
>  
> -	clk_alpha_pll_configure(&ipq_pll, regmap, ipq_pll_config);
> +	clk_alpha_pll_configure(data->pll, regmap, data->pll_config);
>  
> -	ret = devm_clk_register_regmap(dev, &ipq_pll.clkr);
> +	ret = devm_clk_register_regmap(dev, &data->pll->clkr);
>  	if (ret)
>  		return ret;
>  
>  	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
> -					   &ipq_pll.clkr.hw);
> +					   &data->pll->clkr.hw);
>  }
>  
>  static const struct of_device_id apss_ipq_pll_match_table[] = {
> -	{ .compatible = "qcom,ipq6018-a53pll", .data = &ipq6018_pll_config },
> -	{ .compatible = "qcom,ipq8074-a53pll", .data = &ipq8074_pll_config },
> +	{ .compatible = "qcom,ipq6018-a53pll", .data = &ipq6018_pll_data },
> +	{ .compatible = "qcom,ipq8074-a53pll", .data = &ipq8074_pll_data },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, apss_ipq_pll_match_table);