linux-kernel - Re: [PATCH v5 10/10] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.

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Message-Id: <311d0c03-06f3-4c68-aa5a-877a592b6975@www.fastmail.com>
Date:   Wed, 09 Jun 2021 10:26:11 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Steven Lee" <steven_lee@...eedtech.com>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Bartosz Golaszewski" <bgolaszewski@...libre.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Joel Stanley" <joel@....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>
Cc:     "Hongwei Zhang" <Hongweiz@....com>,
        "Ryan Chen" <ryan_chen@...eedtech.com>,
        "Billy Tsai" <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v5 10/10] gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.



On Tue, 8 Jun 2021, at 19:55, Steven Lee wrote:
> Add an else-if condition in the probe function to check whether ngpios is
> multiple of 8.
> Per AST datasheet, numbers of available serial GPIO pins in Serial GPIO
> Configuration Register must be n bytes. For instance, if n = 1, it means
> AST SoC supports 8 GPIO pins.
> 
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>

Reviewed-by: Andrew Jeffery <andrew@...id.au>