linux-kernel - Re: [PATCH] pinctrl: stmfx: Fix compile issue when CONFIG_OF

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Message-ID: <20190522093026.GG4574@dell>
Date:   Wed, 22 May 2019 10:30:26 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Amelie DELAUNAY <amelie.delaunay@...com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "kbuild-all@...org" <kbuild-all@...org>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH] pinctrl: stmfx: Fix compile issue when CONFIG_OF_GPIO is
 not defined

On Wed, 22 May 2019, Amelie DELAUNAY wrote:

> On 5/22/19 10:41 AM, Lee Jones wrote:
> > 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@...el.com>
> >>>> Signed-off-by: Amelie Delaunay <amelie.delaunay@...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
> > 
> 
> Yes COMPILE_TEST is combined with arch when depending on OF. But STMFX 
> isn't arch dependent, it is just OF and I2C dependent.
> 
> Randy also see a build error in pinctrl-stmfx.c when CONFIG_OF is not 
> set/enabled (randconfig):
> 
> ../drivers/pinctrl/pinctrl-stmfx.c:409:20: error: 
> ‘pinconf_generic_dt_node_to_map_pin’ undeclared here (not in a function)
>    .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> 
> OF_GPIO depends on OF.
> 
> So either
>      depends on OF || (OF && COMPILE_TEST)
> or
>      depends on OF || (OF_GPIO && COMPILE_TEST)
> 
> and
> 
>      select OF_GPIO
> 
> What is the prettiest way ?

I'll leave the final call up to Linus.

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