[PATCH 05/33] gpio: add generic single-register fixed-direction GPIO driver

[Linus Walleij]

On Mon, Aug 29, 2016 at 12:24 PM, Russell King
<rmk+kernel at armlinux.org.uk> wrote:

> Add a simple, generic, single register fixed-direction GPIO driver.
> This is able to support a single register where a fixed number of
> bits are used for input and a fixed number of bits used for output.
>
> Signed-off-by: Russell King <rmk+kernel at armlinux.org.uk>

Clever, I like it!

>  include/linux/gpio-reg.h |  12 ++++

Can we put this in include/linux/gpio/gpio-reg.h?

I try to do some scopeing to <linux/gpio/*> there.

> +#define to_gpio_reg(x) container_of(x, struct gpio_reg, gc)

You don't need that trickery anymore, just:

> +static int gpio_reg_get_direction(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct gpio_reg *r = to_gpio_reg(gc);

struct gpio_reg *r = gpiochip_get_data(gc);

(applied everywhere)

> +       if (dev)
> +               ret = devm_gpiochip_add_data(dev, &r->gc, r);
> +       else
> +               ret = gpiochip_add_data(&r->gc, r);

Aha both device and device-less, I see.

Apart from that it looks nice, any other questionmarks were
fixed in the other replies.

Yours,
Linus Walleij