linux-kernel - Re: [PATCH 1/4] clk: qcom: clk-alpha-pll: Add support for lucid ole pll ops

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Message-ID: <55fc32df-f01b-1ba3-3813-26a5f8c7f730@quicinc.com>
Date:   Fri, 19 May 2023 18:19:23 +0530
From:   Jagadeesh Kona <quic_jkona@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Conor Dooley <conor+dt@...nel.org>
CC:     Bjorn Andersson <andersson@...nel.org>,
        Taniya Das <quic_tdas@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] clk: qcom: clk-alpha-pll: Add support for lucid ole
 pll ops

Hi,

Thanks Konrad for your review!

On 5/10/2023 1:36 AM, Konrad Dybcio wrote:
> 
> 
> On 9.05.2023 18:12, Jagadeesh Kona wrote:
>> From: Taniya Das <quic_tdas@...cinc.com>
>>
>> Add support for lucid ole pll ops to configure and control the
>> lucid ole pll. The lucid ole pll has an additional test control
>> register which is required to be programmed, add support to
>> program the same.
>>
>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>> ---
> Isn't this commit "write to PLL_TEST_CTL_U2 on LUCID_EVO" instead?
> 
> Meaninglessly duplicating ops does not seem useful.
> 
> Konrad

Though we are reusing same ops for EVO and OLE, PLL_TEST_CTL_U2 register 
programming is applicable only to OLE PLL type. And PLL type is useful 
to properly refer respective hardware datasheets. Hence added separate 
ops for OLE PLL type.


>>   drivers/clk/qcom/clk-alpha-pll.c | 2 ++
>>   drivers/clk/qcom/clk-alpha-pll.h | 4 ++++
>>   2 files changed, 6 insertions(+)
>>
>> diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
>> index b9f6535a7ba7..f81c7c561352 100644
>> --- a/drivers/clk/qcom/clk-alpha-pll.c
>> +++ b/drivers/clk/qcom/clk-alpha-pll.c
>> @@ -55,6 +55,7 @@
>>   #define PLL_TEST_CTL(p)		((p)->offset + (p)->regs[PLL_OFF_TEST_CTL])
>>   #define PLL_TEST_CTL_U(p)	((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U])
>>   #define PLL_TEST_CTL_U1(p)     ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U1])
>> +#define PLL_TEST_CTL_U2(p)     ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U2])
>>   #define PLL_STATUS(p)		((p)->offset + (p)->regs[PLL_OFF_STATUS])
>>   #define PLL_OPMODE(p)		((p)->offset + (p)->regs[PLL_OFF_OPMODE])
>>   #define PLL_FRAC(p)		((p)->offset + (p)->regs[PLL_OFF_FRAC])
>> @@ -2096,6 +2097,7 @@ void clk_lucid_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regma
>>   	clk_alpha_pll_write_config(regmap, PLL_TEST_CTL(pll), config->test_ctl_val);
>>   	clk_alpha_pll_write_config(regmap, PLL_TEST_CTL_U(pll), config->test_ctl_hi_val);
>>   	clk_alpha_pll_write_config(regmap, PLL_TEST_CTL_U1(pll), config->test_ctl_hi1_val);
>> +	clk_alpha_pll_write_config(regmap, PLL_TEST_CTL_U2(pll), config->test_ctl_hi2_val);
>>   
>>   	/* Disable PLL output */
>>   	regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0);
>> diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h
>> index d07b17186b90..4d9b6d5b7062 100644
>> --- a/drivers/clk/qcom/clk-alpha-pll.h
>> +++ b/drivers/clk/qcom/clk-alpha-pll.h
>> @@ -125,6 +125,7 @@ struct alpha_pll_config {
>>   	u32 test_ctl_val;
>>   	u32 test_ctl_hi_val;
>>   	u32 test_ctl_hi1_val;
>> +	u32 test_ctl_hi2_val;
>>   	u32 main_output_mask;
>>   	u32 aux_output_mask;
>>   	u32 aux2_output_mask;
>> @@ -171,6 +172,7 @@ extern const struct clk_ops clk_alpha_pll_zonda_ops;
>>   #define clk_alpha_pll_postdiv_zonda_ops clk_alpha_pll_postdiv_fabia_ops
>>   
>>   extern const struct clk_ops clk_alpha_pll_lucid_evo_ops;
>> +#define clk_alpha_pll_lucid_ole_ops clk_alpha_pll_lucid_evo_ops
>>   extern const struct clk_ops clk_alpha_pll_reset_lucid_evo_ops;
>>   #define clk_alpha_pll_reset_lucid_ole_ops clk_alpha_pll_reset_lucid_evo_ops
>>   extern const struct clk_ops clk_alpha_pll_fixed_lucid_evo_ops;
>> @@ -196,6 +198,8 @@ void clk_zonda_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
>>   			     const struct alpha_pll_config *config);
>>   void clk_lucid_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
>>   				 const struct alpha_pll_config *config);
>> +#define clk_lucid_ole_pll_configure(pll, regmap, config) \
>> +			clk_lucid_evo_pll_configure(pll, regmap, config)
>>   void clk_rivian_evo_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,
>>   				  const struct alpha_pll_config *config);
>>   void clk_stromer_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap,

Thanks & Regards,
Jagadeesh