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

From: H. Nikolaus Schaller
Date: Wed May 02 2018 - 08:37:16 EST



> Am 02.05.2018 um 14:29 schrieb Andy Shevchenko <andy.shevchenko@xxxxxxxxx>:
>
> On Sat, Apr 28, 2018 at 7:31 PM, H. Nikolaus Schaller <hns@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
>> ---
>> 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)

ok.

>
>> +#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

I have also thought about this.

>
> 2) to use GENMASK() in both definitions
>
> 3) as it in this patch.
>
>
> Whatever Linus prefers.

Ok, waiting for his suggestion.

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

BR and thanks,
Nikolaus