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SubjectRe: [PATCH v2] i2c: designware: add support for pinctrl for recovery
From
Hi

On 8/16/23 12:50, Yann Sionneau wrote:
> From: Yann Sionneau <ysionneau@kalray.eu>
>
> Currently if the SoC needs pinctrl to switch the SCL and SDA
> from the I2C function to GPIO function, the recovery won't work.
>
> 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.
>
> Tested-by: Yann Sionneau <ysionneau@kalray.eu>
> Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>

Tested-by from author is needless. Expectation is that author has tested
the patch while not always true :-)

> @@ -905,6 +906,15 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
> return PTR_ERR(gpio);
> rinfo->sda_gpiod = gpio;
>
> + rinfo->pinctrl = devm_pinctrl_get(dev->dev);
> + if (IS_ERR(rinfo->pinctrl)) {
> + if (PTR_ERR(rinfo->pinctrl) == -EPROBE_DEFER)
> + return PTR_ERR(rinfo->pinctrl);
> +
> + rinfo->pinctrl = NULL;
> + dev_info(dev->dev, "can't get pinctrl, bus recovery might not work\n");

I think dev_dbg() suits better here or is it needed at all? End user may
not be able to do anything when sees this in dmesg. I.e. more like
development time dev_dbg() information.

Does i2c-core-base.c: i2c_gpio_init_pinctrl_recovery() already do
dev_info() print when pinctrl & GPIO are set properly making above also
kind of needless?

Jarkko

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