linux-kernel - Re: [PATCH v6 5/9] gpio: gpio-aspeed-sgpio: Add AST2600 sgpio support

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Date:   Fri, 23 Jul 2021 11:57:24 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Steven Lee <steven_lee@...eedtech.com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        Hongwei Zhang <Hongweiz@....com>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v6 5/9] gpio: gpio-aspeed-sgpio: Add AST2600 sgpio support

On Mon, Jul 12, 2021 at 12:04 PM Steven Lee <steven_lee@...eedtech.com> wrote:

> The maximum number of gpio pins of SoC is hardcoded as 80 and the gpio pin
> count mask for GPIO Configuration register is hardcode as GENMASK(9,6).
> However, AST2600 has 2 sgpio master interfaces, one of them supports up
> to 128 gpio pins and pin count mask of GPIO Configuration Register is 5
> bits.
>
> The patch adds ast2600 compatibles, removes MAX_NR_HW_SGPIO and
> corresponding design to make the gpio input/output pin base are determined
> by ngpios.
> The patch also removed hardcoded pin mask and adds ast2400, ast2500,
> ast2600 platform data that include gpio pin count mask for GPIO
> Configuration Register.
>
> The original pin order is as follows:
> (suppose MAX_NR_HW_SGPIO is 80 and ngpios is 10 as well)
> Input:
> 0 1 2 3 ... 9
> Output:
> 80 81 82 ... 89
>
> The new pin order is as follows:
> Input:
> 0 2 4 6 ... 18
> Output:
> 1 3 5 7 ... 19
>
> SGPIO pin id and input/output pin mapping is as follows:
> SGPIO0(0,1), SGPIO1(2,3), ..., SGPIO79(158,159)
>
> For example:
> Access SGPIO5(10,11)
> Get SGPIO pin 5 (suppose sgpio chip id is 2)
> gpioget 2 10
>
> Set SGPIO pin 5 (suppose sgpio chip id is 2)
> gpioset 2 11=1
> gpioset 2 11=0
>
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>

Nice use of match data. This is exactly how it shall be done.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij