linux-kernel - Re: [PATCH 1/1] i2c: designware: add pinctrl for recovery info as an option

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Message-ID: <Y5m2nux5Q1npXAo+@smile.fi.intel.com>
Date:   Wed, 14 Dec 2022 13:42:22 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hanna Hawa <hhhawa@...zon.com>
Cc:     jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com,
        jsd@...ihalf.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, dwmw@...zon.co.uk, benh@...zon.com,
        ronenk@...zon.com, talel@...zon.com, jonnyc@...zon.com,
        hanochu@...zon.com, farbere@...zon.com, itamark@...zon.com
Subject: Re: [PATCH 1/1] i2c: designware: add pinctrl for recovery info as an
 option

On Wed, Dec 14, 2022 at 10:27:07AM +0000, Hanna Hawa wrote:
> The current implementation of designware recovery mechanism fit for
> specific device (Intel / Altera Cyclone V SOC) which have two separated
> "wired" GPIOs to the i2c bus via the SOC FPGA for the i2c recovery.
> 
> This change add ability to get the pinctrl for the i2c recovery in order
> to switch between pin configuration (I2C and GPIO functionality) if the
> pinctrl exists.

...

> +	rinfo->pinctrl = devm_pinctrl_get(dev->dev);
> +	if (IS_ERR(rinfo->pinctrl)) {
> +		if (PTR_ERR(rinfo->pinctrl) == -EPROBE_DEFER)
> +			return -EPROBE_DEFER;
> +		rinfo->pinctrl = NULL;
> +		dev_dbg(dev->dev, "can't get pinctrl for i2c recovery\n");
> +	}

Can you explain, why pinctrl_bind_pins() is not enough?

(You may also refer to the ab78029ecc34 ("drivers/pinctrl: grab default handles
 from device core") for more details.)

-- 
With Best Regards,
Andy Shevchenko