[Letux-kernel] [PATCH v5 4/7] gpio: pca953x: define masks for addressing common and extended registers

[Andy Shevchenko]

On Sat, Apr 28, 2018 at 7:31 PM, H. Nikolaus Schaller <hns at goldelico.com> wrote:
> These mask bits are to be used to map the extended register
> addreseses (which are defined for an unsupported 8-bit pcal chip)
> to 16 and 24 bit chips (pcal6524).
>
> Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
> ---
>  drivers/gpio/gpio-pca953x.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
> index 2b667166e855..fc863faa3ce4 100644
> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -56,6 +56,9 @@
>  #define PCAL6524_DEBOUNCE      0x2d
>
>  #define PCA_GPIO_MASK          0x00FF

+ empty line (the above is about contents, not addresses)

> +#define PCAL_GPIO_MASK         GENMASK(4, 0)
> +#define PCAL_PINCTRL_MASK      (~PCAL_GPIO_MASK)

I'm not sure which would be better here

1) to follow existing style
0x1F
0xE0

2) to use GENMASK() in both definitions

3) as it in this patch.


Whatever Linus prefers.

> +
>  #define PCA_INT                        0x0100
>  #define PCA_PCAL               0x0200
>  #define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
> --
> 2.12.2
>



-- 
With Best Regards,
Andy Shevchenko