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SubjectRe: [PATCH] i2c: imx: make bus recovery through pinctrl optional
Hello,

On Tue, Nov 17, 2015 at 06:02:59PM -0600, Li Yang wrote:
> Since commit 1c4b6c3bcf30 ("i2c: imx: implement bus recovery") the driver
> starts to use gpio/pinctrl to do i2c bus recovery. But pinctrl is not
> always available for platforms using this driver such as ls1021a and
> ls1043a, and the device tree binding also mentioned this gpio based
> recovery mechanism as optional. The patch make it really optional that
> the probe function won't bailout when pinctrl is not available and it
> won't try to register recovery functions if pinctrl is NULL when the
> PINCTRL is not enabled at all.
>
> Signed-off-by: Li Yang <leoli@freescale.com>
> Cc: Gao Pan <b54642@freescale.com>
> ---
> drivers/i2c/busses/i2c-imx.c | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 1e4d99d..7813153 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -1086,12 +1086,6 @@ static int i2c_imx_probe(struct platform_device *pdev)
> return ret;
> }
>
> - i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev);
> - if (IS_ERR(i2c_imx->pinctrl)) {
> - ret = PTR_ERR(i2c_imx->pinctrl);
> - goto clk_disable;
> - }
> -
> /* Request IRQ */
> ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, 0,
> pdev->name, i2c_imx);
> @@ -1125,7 +1119,12 @@ static int i2c_imx_probe(struct platform_device *pdev)
> goto clk_disable;
> }
>
> - i2c_imx_init_recovery_info(i2c_imx, pdev);
> + /* optional bus recovery feature through pinctrl */
> + i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev);
> + if (IS_ERR_OR_NULL(i2c_imx->pinctrl))
> + dev_info(&pdev->dev, "can't get pinctrl, bus recovery feature disabled\n");
> + else
> + i2c_imx_init_recovery_info(i2c_imx, pdev);

I'm pretty sure this is wrong. If pinctrl isn't available
devm_pinctrl_get returns NULL? But AFAIK you must not ignore an error,
so the better thing to do is:

i2c_imx->pinctrl = devm_pinctrl_get(&pdev->dev);
if (IS_ERR(i2c_imx->pinctrl)) {
ret = PTR_ERR(i2c_imx->pinctrl);
goto errorhandling;
}

if (i2c_imx->pinctrl)
i2c_imx_init_recovery_info(i2c_imx, pdev);
else
dev_info(&pdev->dev, "can't get pinctrl, bus recovery feature disabled\n");


right?

Uwe Kleine-König

--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |


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