Re: [PATCH] pinctrl: stmfx: Fix compile issue when CONFIG_OF_GPIO is not defined

From: Lee Jones <lee.jones@linaro.org>
To: Amelie DELAUNAY <amelie.delaunay@st.com>
Cc: Alexandre TORGUE <alexandre.torgue@st.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	"kbuild-all@01.org" <kbuild-all@01.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	"linux-stm32@st-md-mailman.stormreply.com"
	<linux-stm32@st-md-mailman.stormreply.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] pinctrl: stmfx: Fix compile issue when CONFIG_OF_GPIO is not defined
Date: Wed, 22 May 2019 09:41:33 +0100	[thread overview]
Message-ID: <20190522084133.GF4574@dell> (raw)
In-Reply-To: <eb8425ec-989a-9701-7fee-61bd1d2b93c1@st.com>

On Wed, 22 May 2019, Amelie DELAUNAY wrote:
> On 5/22/19 7:48 AM, Lee Jones wrote:
> > On Mon, 20 May 2019, Amelie Delaunay wrote:
> > 
> >> When CONFIG_GPIO_OF is not defined, struct gpio_chip 'of_node' member does
> >> not exist:
> >> drivers/pinctrl/pinctrl-stmfx.c: In function 'stmfx_pinctrl_probe':
> >> drivers/pinctrl/pinctrl-stmfx.c:652:17: error: 'struct gpio_chip' has no member named 'of_node'
> >>       pctl->gpio_chip.of_node = np;
> >>
> >> Fixes: 1490d9f841b1 ("pinctrl: Add STMFX GPIO expander Pinctrl/GPIO driver")
> >> Reported-by: kbuild test robot <lkp@intel.com>
> >> Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
> >> ---
> >>   drivers/pinctrl/pinctrl-stmfx.c | 2 ++
> >>   1 file changed, 2 insertions(+)
> >>
> >> diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c
> >> index eba872c..bb64aa0 100644
> >> --- a/drivers/pinctrl/pinctrl-stmfx.c
> >> +++ b/drivers/pinctrl/pinctrl-stmfx.c
> >> @@ -648,7 +648,9 @@ static int stmfx_pinctrl_probe(struct platform_device *pdev)
> >>   	pctl->gpio_chip.base = -1;
> >>   	pctl->gpio_chip.ngpio = pctl->pctl_desc.npins;
> >>   	pctl->gpio_chip.can_sleep = true;
> >> +#ifdef CONFIG_OF_GPIO
> >>   	pctl->gpio_chip.of_node = np;
> >> +#endif
> > 
> > This is pretty ugly.  Will STMFX ever be used without OF support?  If
> > not, it might be better to place this restriction on the driver as a
> > whole.
> > 
> > Incidentally, why is this blanked out in the structure definition?
> > Even 'struct device' doesn't do this.
> > 
> config PINCTRL_STMFX
> 	tristate "STMicroelectronics STMFX GPIO expander pinctrl driver"
> 	depends on I2C
> 	depends on OF || COMPILE_TEST
> 	select GENERIC_PINCONF
> 	select GPIOLIB_IRQCHIP
> 	select MFD_STMFX
> 
> The issue is due to COMPILE_TEST: would "depends on OF || (OF && 
> COMPILE_TEST)" be better ?

Linus would be in a better position to respond, but from what I can
see, maybe:

  depends on OF || (OF_GPIO && COMPILE_TEST)

Although, I'm unsure why other COMPILE_TESTs haven't highlighted this
issue.  Perhaps because they have all been locked down to a particular
arch:

$ grep COMPILE_TEST -- drivers/pinctrl/Kconfig 
	bool "Support pin multiplexing controllers" if COMPILE_TEST
	bool "Support pin configuration controllers" if COMPILE_TEST
	depends on OF && (ARCH_DAVINCI_DA850 || COMPILE_TEST)
	depends on OF && (ARCH_DIGICOLOR || COMPILE_TEST)
	depends on OF && (ARCH_LPC18XX || COMPILE_TEST)
	depends on ARCH_R7S72100 || COMPILE_TEST
	depends on ARCH_R7S9210 || COMPILE_TEST
	depends on ARCH_RZN1 || COMPILE_TEST
	depends on MIPS || COMPILE_TEST

What about adding this to your Kconfig entry:

  select OF_GPIO

> >>   	pctl->gpio_chip.need_valid_mask = true;
> >>   
> >>   	ret = devm_gpiochip_add_data(pctl->dev, &pctl->gpio_chip, pctl);
> > 

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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