linux-kernel - Re: [PATCH] i2c: designware: add support for pinctrl for recovery

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Message-ID: <ZNZHfPCMg1Js28iF@smile.fi.intel.com>
Date:   Fri, 11 Aug 2023 17:36:44 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Yann Sionneau <yann@...nneau.net>
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yann Sionneau <ysionneau@...ray.eu>
Subject: Re: [PATCH] i2c: designware: add support for pinctrl for recovery

On Fri, Aug 11, 2023 at 03:52:01PM +0200, Yann Sionneau wrote:
> From: Yann Sionneau <ysionneau@...ray.eu>
> 
> Currently if the SoC needs pinctrl to switch the scl and sda

SCL
SDA

> from hw function to gpio function, the recovery won't work.

from the I2C

GPIO

> scl-gpio = <>;
> sda-gpio = <>;
> 
> Are not enough for some SoCs to have a working recovery.
> Some need:
> 
> scl-gpio = <>;
> sda-gpio = <>;
> pinctrl-names = "default", "recovery";
> pinctrl-0 = <&i2c_pins_hw>;
> pinctrl-1 = <&i2c_pins_gpio>;
> 
> The driver was not filling rinfo->pinctrl with the device node
> pinctrl data which is needed by generic recovery code.

...

>  #include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
>  #include <linux/reset.h>
> +#include <linux/pinctrl/consumer.h>

Keep this in order.

...

> +	rinfo->pinctrl = devm_pinctrl_get(dev->dev);
> +	if (!rinfo->pinctrl || IS_ERR(rinfo->pinctrl)) {

It's not possible to have it NULL, why a dead code?

> +		rinfo->pinctrl = NULL;
> +		dev_info(dev->dev, "can't get pinctrl, bus recovery might not work\n");
> +	}

-- 
With Best Regards,
Andy Shevchenko