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 15:29:29 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "H. Nikolaus Schaller" <hns@...delico.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 v5 4/7] gpio: pca953x: define masks for addressing common
 and extended registers

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)

> +#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