linux-kernel - Re: [PATCH v6 2/3] gpio: pca953x: define masks for addressing common and extended registers

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Date:   Wed, 16 May 2018 21:57:36 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Kumar Gala <galak@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>, kernel@...a-handheld.com
Subject: Re: [PATCH v6 2/3] gpio: pca953x: define masks for addressing common and extended registers


> Am 16.05.2018 um 21:50 schrieb Andy Shevchenko <andy.shevchenko@...il.com>:
> 
> On Wed, May 16, 2018 at 8:01 PM, H. Nikolaus Schaller <hns@...delico.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).
>> 
>> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
>> ---
>> drivers/gpio/gpio-pca953x.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>> 
>> diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
>> index 2b667166e855..c0eb679e60d4 100644
>> --- a/drivers/gpio/gpio-pca953x.c
>> +++ b/drivers/gpio/gpio-pca953x.c
>> @@ -56,6 +56,10 @@
>> #define PCAL6524_DEBOUNCE      0x2d
>> 
>> #define PCA_GPIO_MASK          0x00FF
>> +
>> +#define PCAL_GPIO_MASK         GENMASK(4, 0)
>> +#define PCAL_PINCTRL_MASK      (~PCAL_GPIO_MASK)
>> +
> 
> I give second thought about it, and think
> either plain values, or second converted to its own explicit GENMASK
> would be better.
> 
> (most confusing part to me is unknowness of the side of PINCTRL part
> in the mask)

I see.

Then, I'd also prefer plain values.

If ok, I can send a v7 tomorrow.

BR,
Nikolaus