linux-kernel - Re: [PATCH 2/2] pinctrl: Add driver support for Amlogic C3 SoCs

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Message-ID: <508344ff-6cb7-0658-89ae-c6873079e1b3@amlogic.com>
Date:   Fri, 7 Jul 2023 12:07:59 +0800
From:   Huqiang Qin <huqiang.qin@...ogic.com>
To:     Andy Shevchenko <andy@...nel.org>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        neil.armstrong@...aro.org, khilman@...libre.com,
        jbrunet@...libre.com, martin.blumenstingl@...glemail.com,
        brgl@...ev.pl, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] pinctrl: Add driver support for Amlogic C3 SoCs

Hi Andy Shevchenko,


On 2023/7/6 20:29, Andy Shevchenko wrote:
> 
> On Thu, Jul 06, 2023 at 07:45:22PM +0800, Huqiang Qin wrote:
>> Add new pinctrl driver for Amlogic C3 SoCs which share the
> 
> a new

Okay

> 
>> same register layout as the previous Amloigc S4
> 
> Missing period at the end.

Okay

> 
> ...
> 
>> +config PINCTRL_AMLOGIC_C3
>> +     tristate "Amlogic C3 SoC pinctrl driver"
>> +     depends on ARM64
>> +     select PINCTRL_MESON_AXG_PMX
>> +     default y
> 
> This default seems a bad cargo cult. Why ARM64 kernel should have all them be
> opt-out, instead of opt-in? Shouldn't this be a distro problem?

The Kconfig structure is as follows:

menuconfig PINCTRL_MESON
	tristate "Amlogic SoC pinctrl drivers"
	depends on ARCH_MESON || COMPILE_TEST
	...

if PINCTRL_MESON
...
config PINCTRL_AMLOGIC_C3
	tristate "Amlogic C3 SoC pinctrl driver"
	depends on ARM64
	select PINCTRL_MESON_AXG_PMX
	default y

endif

When ARCH_MESON is not selected, all pinctrl drivers of Amlogic will not be compiled by default

> 
> ...
> 
>> +     MESON_PIN(GPIO_TEST_N)
> 
> Is it real one?

Yes, it's real GPIO and supports interrupts, similar to Amlogic S4 SoC

> 
>> +};
> 
> ...
> 
>> +     /* Bank A func6 */
>> +     GROUP(spi_a_mosi_a,             6),
>> +     GROUP(gen_clk_a4,               6),
>> +     GROUP(clk12_24_a,               6)
> 
> Leave trailing comma here as it's not a terminator.

Okay

> 
> ...
> 
>> +static const char * const i2c2_groups[] = {
>> +     "i2c2_sda", "i2c2_scl"
> 
> Ditto.

Okay

> 
>> +};
>> +
>> +static const char * const i2c3_groups[] = {
>> +     "i2c3_sda_c", "i2c3_scl_c",
>> +     "i2c3_sda_x", "i2c3_scl_x",
>> +     "i2c3_sda_d", "i2c3_scl_d"
> 
> Ditto.

Okay

> 
>> +};
> 
> ...
> 
>> +#ifdef CONFIG_OF
> 
> Drop this ugly ifdeffery.

Okay

> 
>> +static const struct of_device_id c3_pinctrl_dt_match[] = {
>> +     {
>> +             .compatible = "amlogic,c3-periphs-pinctrl",
>> +             .data = &c3_periphs_pinctrl_data,
>> +     },
>> +     { },
> 
> No comma for the terminator.

Okay

> 
>> +};
>> +MODULE_DEVICE_TABLE(of, c3_pinctrl_dt_match);
>> +#endif /* CONFIG_OF */
>> +
>> +static struct platform_driver c3_pinctrl_driver = {
>> +     .probe  = meson_pinctrl_probe,
>> +     .driver = {
>> +             .name = "amlogic-c3-pinctrl",
> 
>> +             .of_match_table = of_match_ptr(c3_pinctrl_dt_match),
> 
> Drop the rather problematic of_match_ptr().

Okay

> 
>> +     },
>> +};
> 
> --
> With Best Regards,
> Andy Shevchenko
> 
> 
> 


Best Regards,
Huqiang Qin