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Message-ID: <4a9248c0-96ec-1986-d874-1cb7d8aac0ac@linaro.org>
Date:   Fri, 19 May 2023 15:09:05 +0200
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Subject: Re: [PATCH 1/4] clk: qcom: clk-alpha-pll: Add support for lucid ole
 pll ops
Content-Language: en-US
To:     Jagadeesh Kona <quic_jkona@quicinc.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Conor Dooley <conor+dt@kernel.org>
Cc:     Bjorn Andersson <andersson@kernel.org>,
        Taniya Das <quic_tdas@quicinc.com>,
        linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20230509161218.11979-1-quic_jkona@quicinc.com>
 <20230509161218.11979-2-quic_jkona@quicinc.com>
 <019999fd-3c86-8c85-76c7-8d0206e60f4d@linaro.org>
 <55fc32df-f01b-1ba3-3813-26a5f8c7f730@quicinc.com>
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
In-Reply-To: <55fc32df-f01b-1ba3-3813-26a5f8c7f730@quicinc.com>
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Precedence: bulk


On 19.05.2023 14:49, Jagadeesh Kona wrote:
> 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@quicinc.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@quicinc.com>
>>> Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.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.
Well, your patch makes it unconditional (modulo programmer error) so
I think that makes little sense.. A comment would be enough, imo.

Konrad
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