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 <le...@freescale.com>
> Cc: Gao Pan <b54...@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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