[PATCH v7] reset: Add driver for gpio-controlled reset pins

[p.zabel@pengutronix.de (Philipp Zabel)]

Hi Stephen,

Am Mittwoch, den 29.05.2013, 17:19 -0600 schrieb Stephen Warren:
> On 05/28/2013 09:06 AM, Philipp Zabel wrote:
> > This driver implements a reset controller device that toggle a gpio
> > connected to a reset pin of a peripheral IC. The delay between assertion
> > and de-assertion of the reset signal can be configured via device tree.
> 
> > diff --git a/drivers/reset/gpio-reset.c b/drivers/reset/gpio-reset.c
> 
> > +static void __gpio_reset_set(struct reset_controller_dev *rcdev, int asserted)
> 
> Nit: Technically I think __ is a reserved name-space, so you shouldn't
> prefix "user-level" (rather than libc/similar) symbols with it, but it's
> not a big deal.

I'll s/__//.

> > +static int gpio_reset_probe(struct platform_device *pdev)
> 
> > +	if (of_gpio_named_count(np, "reset-gpios") != 1)
> > +		return -EINVAL;
> 
> Should that error-path (and the path for of_property_read_u32() failure)
> include a dev_err() like some already do, so it's obvious what the
> failure is?

For reset-gpios, yes. reset-delay-us is marked as optional in the
bindings.

> > +	reset_controller_register(&drvdata->rcdev);
> > +
> > +	platform_set_drvdata(pdev, drvdata);
> 
> It might be better to set the drvdata right after it's been allocated.
> It perhaps doesn't matter much here, but if the reset controller core
> ever starts calling into the registered device inside the call to
> reset_controller_register(), then there might be a problem.

Alright. I'll move ist above the reset_controller_register() call.

> Aside from those minor issues,
> Reviewed-by: Stephen Warren <swarren@nvidia.com>

thanks
Philipp