From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Schrempf Frieder <frieder.schrempf@kontron.de>
Cc: "linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
Jiri Slaby <jslaby@suse.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-imx@nxp.com" <linux-imx@nxp.com>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"festevam@gmail.com" <festevam@gmail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] serial: mctrl_gpio: Avoid probe failures in case of missing gpiolib
Date: Thu, 1 Aug 2019 16:47:07 +0200 [thread overview]
Message-ID: <20190801144707.vprfi4yy2shxmtyw@pengutronix.de> (raw)
In-Reply-To: <20190801124446.15703-1-frieder.schrempf@kontron.de>
On Thu, Aug 01, 2019 at 12:46:42PM +0000, Schrempf Frieder wrote:
> From: Frieder Schrempf <frieder.schrempf@kontron.de>
>
> If CONFIG_GPIOLIB is not enabled, mctrl_gpio_init() and
> mctrl_gpio_init_noauto() will currently return an error pointer with
> -ENOSYS. As the mctrl GPIOs are usually optional, drivers need to
> check for this condition to allow continue probing.
>
> To avoid the need for this check in each driver, we return NULL
> instead, as all the mctrl_gpio_*() functions are skipped anyway.
> We also adapt mctrl_gpio_to_gpiod() to be in line with this change.
>
> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
> ---
> drivers/tty/serial/serial_mctrl_gpio.c | 3 +++
> drivers/tty/serial/serial_mctrl_gpio.h | 6 +++---
> drivers/tty/serial/sh-sci.c | 2 +-
I'd split the sh-sci change in a separate patch. And there is another
instance in drivers/tty/serial/8250/8250_core.c that should be dropped.
Other than that looks good.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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prev parent reply other threads:[~2019-08-01 14:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-01 12:46 [PATCH] serial: mctrl_gpio: Avoid probe failures in case of missing gpiolib Schrempf Frieder
2019-08-01 13:19 ` Fabio Estevam
2019-08-01 14:47 ` Uwe Kleine-König [this message]
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