Re: [PATCH 1/1] gpio: tegra186: Set fwnode of the GPIO chip

Andy Shevchenko
2023-10-10T14:14:03Z

On Tue, Oct 10, 2023 at 04:48:25PM +0300, Andy Shevchenko wrote:
> On Tue, Oct 10, 2023 at 04:13:19PM +0300, Andy Shevchenko wrote:
> > On Mon, Oct 09, 2023 at 10:38:58AM -0700, Dipen Patel wrote:

...

> > > + /*
> > > + * This is needed for driver using gpio device matching where it
> > > + * has to use gpio_chip fwnode to match the gpio controller.
> > > + */
> > > + gpio->gpio.fwnode = of_node_to_fwnode(pdev->dev.of_node);
> >
> > of_node_to_fwnode() is specific to IRQ, in other places we use generic
> > of_fwnode_handle(). That's why better just to use dev_fwnode().
>
> On the second thought is there any parent assigned?
> At least I see that in tegra186_gpio_probe(). Are you saying
> it is not working? Or is it (matching) called _before_ we
> add a GPIO device?

Okay, I think I got it. There is a function called tegra_gpiochip_match()
in drivers/hte/hte-tegra194.c which fails after my patch. Yeah, if provider
doesn't set fwnode, it can't match. But, since the driver sets the parent
properly it means that the matching function should be done against the
device.

Seems to me that in HTE code the matching function is broken.