i2c: imx: Make SDA actually optional for bus recovering

Both i2c_generic_scl_recovery() and the debug output indicate that SDA is
purely optional for bus recovery. But devm_gpiod_get() never returns NULL
making it mandatory. Fix this by calling devm_gpiod_get_optional instead.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Author: tq-steina

drivers/i2c/busses/i2c-imx.c

@@ -1401,7 +1401,7 @@ static int i2c_imx_init_recovery_info(struct imx_i2c_struct *i2c_imx,
 			PINCTRL_STATE_DEFAULT);
 	i2c_imx->pinctrl_pins_gpio = pinctrl_lookup_state(i2c_imx->pinctrl,
 			"gpio");
-	rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN);
+	rinfo->sda_gpiod = devm_gpiod_get_optional(&pdev->dev, "sda", GPIOD_IN);
 	rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl", GPIOD_OUT_HIGH_OPEN_DRAIN);
 
 	if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER ||