linux-kernel - Re: [PATCH v2 14/14] clk: starfive: jh71x0: Don't register aux devices if JH7110 reset is disabled

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Date:   Tue, 22 Nov 2022 14:12:30 +0800
From:   Hal Feng <hal.feng@...rfivetech.com>
To:     Emil Renner Berthing <emil.renner.berthing@...onical.com>
CC:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        Conor Dooley <conor@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        "Michael Turquette" <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 14/14] clk: starfive: jh71x0: Don't register aux
 devices if JH7110 reset is disabled

On Sat, 19 Nov 2022 01:18:18 +0800, Emil Renner Berthing wrote:
> On Fri, 18 Nov 2022 at 02:06, Hal Feng <hal.feng@...rfivetech.com> wrote:
>>
>> The JH7110 clock drivers will not register redundant auxiliary
>> devices if the JH7110 reset auxiliary driver is disabled.
>>
>> Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
>> ---
>>  drivers/clk/starfive/clk-starfive-jh71x0.c | 11 ++++++++++-
>>  1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/starfive/clk-starfive-jh71x0.c b/drivers/clk/starfive/clk-starfive-jh71x0.c
>> index dda19c6937cb..4e69f56b00cc 100644
>> --- a/drivers/clk/starfive/clk-starfive-jh71x0.c
>> +++ b/drivers/clk/starfive/clk-starfive-jh71x0.c
>> @@ -333,7 +333,7 @@ const struct clk_ops *starfive_jh71x0_clk_ops(u32 max)
>>  }
>>  EXPORT_SYMBOL_GPL(starfive_jh71x0_clk_ops);
>>
>> -#if IS_ENABLED(CONFIG_CLK_STARFIVE_JH7110_SYS)
>> +#if IS_ENABLED(CONFIG_RESET_STARFIVE_JH7110)
> 
> I don't see any reason you'd want to build a kernel that needs the
> clock driver but not the resets, so I don't think this is something we
> should optimize for. I'd just drop this patch and let such broken
> kernels register the auxiliary devices even when no reset driver is
> there to use them.

You're right. I made this patch just following the style of jh7100.
And I think it's better to select RESET_STARFIVE_JH7110 in config
CLK_STARFIVE_JH7110_SYS.

Best regards,
Hal

> 
>>  static void jh7110_reset_unregister_adev(void *_adev)
>>  {
>> @@ -384,4 +384,13 @@ int jh7110_reset_controller_register(struct jh71x0_clk_priv *priv,
>>  }
>>  EXPORT_SYMBOL_GPL(jh7110_reset_controller_register);
>>
>> +#else /* !CONFIG_RESET_STARFIVE_JH7110 */
>> +
>> +int jh7110_reset_controller_register(struct jh71x0_clk_priv *priv,
>> +                                    const char *adev_name,
>> +                                    u32 adev_id)
>> +{
>> +       return 0;
>> +}
>> +
>>  #endif