linux-kernel - Re: [PATCH v2 2/3] pinctrl: meson: Add driver support for Amlogic A4 SoCs

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Message-ID: <6ef6bd97-571e-4243-951f-c6704cdb2b57@amlogic.com>
Date: Tue, 15 Oct 2024 16:08:58 +0800
From: Xianwei Zhao <xianwei.zhao@...ogic.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Bartosz Golaszewski <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 v2 2/3] pinctrl: meson: Add driver support for Amlogic A4
 SoCs

Hi Krzysztof,
     Thanks for your quick reply.

On 2024/10/15 15:59, Krzysztof Kozlowski wrote:
> [ EXTERNAL EMAIL ]
> 
> On 15/10/2024 09:54, Xianwei Zhao wrote:
>> Hi Krzysztof,
>>       Thanks for your reply.
>>
>> On 2024/10/15 14:01, Krzysztof Kozlowski wrote:
>>> [ EXTERNAL EMAIL ]
>>>
>>> On Mon, Oct 14, 2024 at 05:05:52PM +0800, Xianwei Zhao wrote:
>>>> Add a new pinctrl driver for Amlogic A4 SoCs which share
>>>> the same register layout as the previous Amlogic S4.
>>>>
>>>> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>> ---
>>>>    drivers/pinctrl/meson/Kconfig              |    6 +
>>>>    drivers/pinctrl/meson/Makefile             |    1 +
>>>>    drivers/pinctrl/meson/pinctrl-amlogic-a4.c | 1176 ++++++++++++++++++++++++++++
>>>>    3 files changed, 1183 insertions(+)
>>>>
>>>> diff --git a/drivers/pinctrl/meson/Kconfig b/drivers/pinctrl/meson/Kconfig
>>>> index cc397896762c..3e90bb5ec442 100644
>>>> --- a/drivers/pinctrl/meson/Kconfig
>>>> +++ b/drivers/pinctrl/meson/Kconfig
>>>> @@ -67,6 +67,12 @@ config PINCTRL_MESON_S4
>>>>         select PINCTRL_MESON_AXG_PMX
>>>>         default y
>>>>
>>>> +config PINCTRL_AMLOGIC_A4
>>>> +     tristate "Amlogic A4 SoC pinctrl driver"
>>>> +     depends on ARM64
>>>> +     select PINCTRL_MESON_AXG_PMX
>>>> +     default y
>>>> +
>>>>    config PINCTRL_AMLOGIC_C3
>>>>         tristate "Amlogic C3 SoC pinctrl driver"
>>>>         depends on ARM64
>>>> diff --git a/drivers/pinctrl/meson/Makefile b/drivers/pinctrl/meson/Makefile
>>>> index 9e538b9ffb9b..c92a65a83344 100644
>>>> --- a/drivers/pinctrl/meson/Makefile
>>>> +++ b/drivers/pinctrl/meson/Makefile
>>>> @@ -10,5 +10,6 @@ obj-$(CONFIG_PINCTRL_MESON_AXG) += pinctrl-meson-axg.o
>>>>    obj-$(CONFIG_PINCTRL_MESON_G12A) += pinctrl-meson-g12a.o
>>>>    obj-$(CONFIG_PINCTRL_MESON_A1) += pinctrl-meson-a1.o
>>>>    obj-$(CONFIG_PINCTRL_MESON_S4) += pinctrl-meson-s4.o
>>>> +obj-$(CONFIG_PINCTRL_AMLOGIC_A4) += pinctrl-amlogic-a4.o
>>>>    obj-$(CONFIG_PINCTRL_AMLOGIC_C3) += pinctrl-amlogic-c3.o
>>>>    obj-$(CONFIG_PINCTRL_AMLOGIC_T7) += pinctrl-amlogic-t7.o
>>>> diff --git a/drivers/pinctrl/meson/pinctrl-amlogic-a4.c b/drivers/pinctrl/meson/pinctrl-amlogic-a4.c
>>>> new file mode 100644
>>>> index 000000000000..dee1ae43edb5
>>>> --- /dev/null
>>>> +++ b/drivers/pinctrl/meson/pinctrl-amlogic-a4.c
>>>> @@ -0,0 +1,1176 @@
>>>> +// SPDX-License-Identifier: (GPL-2.0-only OR MIT)
>>>> +/*
>>>> + * Pin controller and GPIO driver for Amlogic A4 SoC.
>>>> + *
>>>> + * Copyright (c) 2024 Amlogic, Inc. All rights reserved.
>>>> + * Author: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>> + *         Huqiang Qin <huqiang.qin@...ogic.com>
>>>> + */
>>>> +
>>>> +#include <dt-bindings/gpio/amlogic-a4-gpio.h>
>>>
>>> I do not see any usage of it.
>>>
>>
>> The header file "amlogic-a4-gpio.h"  is used by AMLOGIC_PIN and
>> GPIO_GROUP_V2, The code used  is  AMLOGIC_GPIO().
>> This is binding definition.
> 
> Then all other defines are not used. AMLOGIC_GPIO is not used by DTS, so
> how is that a binding? Don't stuff random defines into the bindings.
> 

The AMlOGIC_GPIO definition depends on other definitions to be used.
It is not currently used by DTS, but will be used by other modules in 
the future.

> Best regards,
> Krzysztof
>