On Saturday, 21 July 2018 14:55:21 MSK Marcel Ziswiler wrote:
> On Sat, 2018-07-21 at 14:17 +0300, Dmitry Osipenko wrote:
>
> > On Saturday, 21 July 2018 12:56:15 MSK Mark Brown wrote:
> >
> > > On Fri, Jul 20, 2018 at 12:31:07PM +0000, Marcel Ziswiler wrote:
> > >
> > > > On Fri, 2018-07-20 at 13:16 +0100, Mark Brown wrote:
> > > >
> > > > > > ac97->sync_gpio = of_get_named_gpio(pdev-
> > > > > > >
> > > > > > >dev.of_node,
> > > > > > >
> > > > > >
> > > > > >
> > > > > > "nvidia,codec-
> > > > > >
> > > > > > sync-
> > > > > >
> > > > > > gpio", 0);
> > > > > >
> > > > > >
> > > > > > if (!gpio_is_valid(ac97->sync_gpio)) {
> > > > > >
> > > > > >
> > > > > > - dev_err(&pdev->dev, "no codec-sync GPIO
> > > > > > supplied\n");
> > > > > > + ret = ac97->sync_gpio;
> > > > > > + dev_err(&pdev->dev, "no codec-sync GPIO
> > > > > > supplied:
> > > > > > %d\n", ret);
> > > > > >
> > > > > >
> > > > > > goto err_clk_put;
> > > > > >
> > > > > >
> > > > > > }
> > > > >
> > > > >
> > > > > This isn't reporting an error code associated with the attempt
> > > > > to
> > > > > find a
> > > > > codec-sync GPIO, it's the result of some other operation.
> > > >
> > > >
> > > > What exactly is then the of_get_named_gpio() above please doing
> > > > if
> > > > not getting the codec sync GPIO? I am not following you, sorry.
> > >
> > >
> > > It's not in any way involved in setting the value of ret, whatever
> > > value
> > > that has it's nothing to do with that operation.
> >
> >
> > The comment to gpio_is_valid() says that it "Returns GPIO number to
> > use with
> > Linux generic GPIO API, or one of the errno value on the error
> > condition".
> > Comment doesn't explicitly states that the returned GPIO number is
> > always
> > valid, but it is kinda implied.
>
>
> Do you mean I should be assigning the return value of gpio_is_valid()
> to ret and use that instead?
No, gpio_is_valid() returns a boolean. I think your patch is fine as it is is.
Probably Mark meant something like this:
ac97->sync_gpio = of_get_named_gpio(pdev->dev.of_node,
"nvidia,codec-sync-gpio", 0);
if (ac97->sync_gpio < 0) {
ret = ac97->sync_gpio;
dev_err(&pdev->dev, "no codec-sync GPIO supplied: %d\n", ret);
goto err_clk_put;
}
if (!gpio_is_valid(ac97->sync_gpio)) {
ret = -EINVAL;
goto err_clk_put;
}
But that is not needed because of_get_named_gpio() returns either a valid GPIO
number or a error code.
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