linux-kernel - Re: [PATCH, v1 1/1] gpio: aspeed: Add gpio base address reading

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Date:   Mon, 18 Jan 2021 15:40:57 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Hongwei Zhang <hongweiz@....com>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH, v1 1/1] gpio: aspeed: Add gpio base address reading

On Wed, Jan 13, 2021 at 11:38 PM Hongwei Zhang <hongweiz@....com> wrote:

> Add gpio base address reading in the driver; in old code, it just
> returns -1 to gpio->chip.base.
>
> Fixes: 7ee2d5b4d4340353 ("ARM: dts: nuvoton: Add Fii Kudo system")
> Signed-off-by: Hongwei Zhang <hongweiz@....com>

NAK, sorry.

We never allow the device tree to specify this.

First, it is a Linux-only base so it would have to be a
"linux,..." property.

Even if it is a Linux-only property, it is a bad idea.

Only people using sysfs should have any need to specify global
GPIO numbers. Don't use sysfs. Use the GPIO character device
instead. See further:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpio/TODO

Yours,
Linus Walleij