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

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Date:   Wed, 2 May 2018 14:36:54 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
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>,
        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 v5 4/7] gpio: pca953x: define masks for addressing common and extended registers


> Am 02.05.2018 um 14:29 schrieb Andy Shevchenko <andy.shevchenko@...il.com>:
> 
> On Sat, Apr 28, 2018 at 7:31 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).
>> 
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.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)

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