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SubjectRe: [PATCH v2] staging: greybus: Use gpio_is_valid()
On Sat, Apr 28, 2018 at 10:05:39AM +0530, Arvind Yadav wrote:
> Replace the manual validity checks for the GPIO with the
> gpio_is_valid().
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
> ---
> chnage in v2 :
> Returning invalid gpio as error instead of -ENODEV.
>
> drivers/staging/greybus/arche-platform.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
> index 83254a7..c3a7da5 100644
> --- a/drivers/staging/greybus/arche-platform.c
> +++ b/drivers/staging/greybus/arche-platform.c
> @@ -448,7 +448,7 @@ static int arche_platform_probe(struct platform_device *pdev)
> arche_pdata->svc_reset_gpio = of_get_named_gpio(np,
> "svc,reset-gpio",
> 0);
> - if (arche_pdata->svc_reset_gpio < 0) {
> + if (!gpio_is_valid(arche_pdata->svc_reset_gpio)) {
> dev_err(dev, "failed to get reset-gpio\n");
> return arche_pdata->svc_reset_gpio;

I'm sorry, but I don't this change is desirable. of_get_named_gpio()
returns a valid gpio number or a negative errno, so there's no need to
use the legacy gpio_is_valid() helper here.

If you grep for of_get_named_gpio() you'll find that some drivers indeed
use that helper this way, but they are in a clear minority.

And ultimately, we want to move to using gpio descriptors anyway.

> }
> @@ -468,7 +468,7 @@ static int arche_platform_probe(struct platform_device *pdev)
> arche_pdata->svc_sysboot_gpio = of_get_named_gpio(np,
> "svc,sysboot-gpio",
> 0);
> - if (arche_pdata->svc_sysboot_gpio < 0) {
> + if (!gpio_is_valid(arche_pdata->svc_sysboot_gpio)) {
> dev_err(dev, "failed to get sysboot gpio\n");
> return arche_pdata->svc_sysboot_gpio;
> }
> @@ -487,7 +487,7 @@ static int arche_platform_probe(struct platform_device *pdev)
> arche_pdata->svc_refclk_req = of_get_named_gpio(np,
> "svc,refclk-req-gpio",
> 0);
> - if (arche_pdata->svc_refclk_req < 0) {
> + if (!gpio_is_valid(arche_pdata->svc_refclk_req)) {
> dev_err(dev, "failed to get svc clock-req gpio\n");
> return arche_pdata->svc_refclk_req;
> }

But if this were to be changed, you'd need to update also the fourth
call to of_get_named_gpio() in this function.

Thanks,
Johan

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