linux-kernel - Re: [PATCH 01/32] pwm: sun4i: convert to devm_platform_ioremap

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Date:   Thu, 12 Nov 2020 22:14:29 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     alexandre.belloni@...tlin.com, heiko@...ech.de,
        Yangtao Li <tiny.windzz@...il.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-riscv@...ts.infradead.org, festevam@...il.com,
        f.fainelli@...il.com, shc_work@...l.ru, khilman@...libre.com,
        wens@...e.org, jonathanh@...dia.com,
        linux-rockchip@...ts.infradead.org,
        ludovic.desroches@...rochip.com,
        bcm-kernel-feedback-list@...adcom.com, linux-imx@....com,
        slemieux.tyco@...il.com, linux-pwm@...r.kernel.org,
        rjui@...adcom.com, s.hauer@...gutronix.de, mripard@...nel.org,
        vz@...ia.com, linux-mediatek@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, paul.walmsley@...ive.com,
        matthias.bgg@...il.com, linux-amlogic@...ts.infradead.org,
        Lee Jones <lee.jones@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, sbranden@...adcom.com,
        nicolas.ferre@...rochip.com, palmer@...belt.com,
        kernel@...gutronix.de, shawnguo@...nel.org,
        claudiu.beznea@...rochip.com, nsaenzjulienne@...e.de
Subject: Re: [PATCH 01/32] pwm: sun4i: convert to
 devm_platform_ioremap_resource

Hello Thierry,

On Thu, Nov 12, 2020 at 08:06:49PM +0100, Thierry Reding wrote:
> I also think that it's overly narrow is scope, so you can't actually
> "blindly" use this helper and I've seen quite a few cases where this was
> unknowingly used for cases where it shouldn't have been used and then
> broke things (because some drivers must not do the request_mem_region()
> for example).

You have a link to such an accident?

> And then there are cases where the driver needs the
> resource for some other purpose, so you can't use the helper either, or
> at least it looses all of its advantages in those cases.

There is devm_platform_get_and_ioremap_resource() for (some of) these
cases.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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