Re: [PATCH 1/6] clk: qcom: apss-ipq-pll: refactor the driver to accommodate different PLL types

[Kathiravan T <quic_kathirav@xxxxxxxxxxx>]

On 2/2/2023 8:45 PM, Konrad Dybcio wrote:
> On 2.02.2023 15:52, 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 device
> > data.
> >
> > Signed-off-by: Kathiravan T <quic_kathirav@xxxxxxxxxxx>
> > ---
> >   drivers/clk/qcom/apss-ipq-pll.c | 55 +++++++++++++++++++++------------
> >   1 file changed, 36 insertions(+), 19 deletions(-)
> >
> > diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
> > index a5aea27eb867..6e815e8b7fe4 100644
> > --- a/drivers/clk/qcom/apss-ipq-pll.c
> > +++ b/drivers/clk/qcom/apss-ipq-pll.c
> > @@ -8,20 +8,22 @@
> >   
> >   #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,
> > +static const u8 ipq_pll_offsets[][PLL_OFF_MAX_REGS] = {
> > +	[CLK_ALPHA_PLL_TYPE_HUAYRA] =  {
> Is it really huayra? The definition in clk-alpha-pll.c is
> different..


As per the HW document, yes it is Huayra. When you say "different", I 
understand these offsets are not matching with the one in 
clk-alpha-pll.c right? I checked with the sub system owner and they said 
it is expected since these PLLs are specific to each subsystem(A53 and 
GCC), so the offsets are different.


Thanks,

Kathiravan T.


> Konrad
> > +		[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 +63,21 @@ 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 +88,7 @@ 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 +102,23 @@ 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);