linux-kernel - Re: [PATCH 5/8] arm64: dts: amlogic: meson-g12b-odroid-go-ultra: rename keypad-gpio pinctrl node

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Message-ID: <e0d71204-87f3-1d07-3927-909d09d39000@linaro.org>
Date:   Mon, 13 Feb 2023 10:03:49 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Christian Hewitt <christianshewitt@...il.com>,
        Yuntian Zhang <yt@...xa.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/8] arm64: dts: amlogic: meson-g12b-odroid-go-ultra:
 rename keypad-gpio pinctrl node

On 11/02/2023 21:04, Martin Blumenstingl wrote:
> On Tue, Feb 7, 2023 at 4:08 PM Neil Armstrong <neil.armstrong@...aro.org> wrote:
>>
>> Fixes the following bindings check error:
>> pinctrl@40: keypad-gpio: {...} is not of type 'array'
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> 
> [...]
>>   &periphs_pinctrl {
>> -       keypad_gpio_pins: keypad-gpio {
>> +       keypad_gpio_pins: keypad-gpio-state {
>>                  mux {
>>                          groups = "GPIOX_0", "GPIOX_1", "GPIOX_2", "GPIOX_3",
>>                                   "GPIOX_4", "GPIOX_5", "GPIOX_6", "GPIOX_7",
> I'm wondering whether we make the keys work without having to specify
> a pinmux configuration for them separately.
> Our pinctrl driver already sets:
>     pc->chip.set_config = gpiochip_generic_config;
> So you should be able to use the GPIO_PULL_UP flag for these GPIOs in
> device-tree instead of specifying bias-pull-up here, for example:
>     gpios = <&gpio GPIOX_0 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
> 
> output-disable is managed by the direction of the GPIO anyways.
> pinmux_ops.gpio_request_enable is also implemented by our pinctrl driver.
> 
> This is not urgent - I am just curious as always :-)

I didn't know we supported this, this is only a bindings check fix, but yeah at
some point this should be moved to (GPIO_ACTIVE_LOW | GPIO_PULL_UP).

Neil

> 
> 
> Best regards,
> Martin