linux-kernel - Re: [PATCH 1/4 v3] GPIO: gpio-dwapb: Enable platform driver binding to MFD driver

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Date:	Tue, 09 Sep 2014 10:05:33 -0700
From:	Darren Hart <dvhart@...radead.org>
To:	Weike Chen <alvin.chen@...el.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	atull <atull@...nsource.altera.com>
CC:	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Boon Leong Ong <boon.leong.ong@...el.com>,
	Hock Leong Kweh <hock.leong.kweh@...el.com>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	Mika Westerberg <mika.westerberg@...el.com>,
	Andriy Shevchenko <andriy.shevchenko@...el.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/4 v3] GPIO: gpio-dwapb: Enable platform driver binding
 to MFD driver

On 9/9/14, 11:07, "Weike Chen" <alvin.chen@...el.com> wrote:

>The Synopsys DesignWare APB GPIO driver only supports open firmware
>devices.
>But, like Intel Quark X1000 SOC, which has a single PCI function exporting
>a GPIO and an I2C controller, it is a Multifunction device. This patch is
>to enable the current Synopsys DesignWare APB GPIO driver to support the
>Multifunction device which exports the designware GPIO controller.
>
>Reviewed-by: Hock Leong Kweh <hock.leong.kweh@...el.com>
>Signed-off-by: Weike Chen <alvin.chen@...el.com>
>---
> drivers/gpio/Kconfig                     |    1 -
> drivers/gpio/gpio-dwapb.c                |  226
>++++++++++++++++++++++--------
> include/linux/platform_data/gpio-dwapb.h |   32 +++++
> 3 files changed, 201 insertions(+), 58 deletions(-)
> create mode 100644 include/linux/platform_data/gpio-dwapb.h
>
>diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
>index 9de1515..8250a44 100644
>--- a/drivers/gpio/Kconfig
>+++ b/drivers/gpio/Kconfig
>@@ -136,7 +136,6 @@ config GPIO_DWAPB
> 	tristate "Synopsys DesignWare APB GPIO driver"
> 	select GPIO_GENERIC
> 	select GENERIC_IRQ_CHIP
>-	depends on OF_GPIO

You cover this specific dependencies with inline ifdefs, but you lose the
CONFIG_OF depends by dropping it, and there are no such checks in the
probe routine. Assumptions of OF are not limited to probe in this driver.

While I would like to see this assumption properly abstracted, the most
expedient/immediate fix is probably to add a depends on OF above.

--
Darren
Intel Open Source Technology Center


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