linux-kernel - Re: [PATCH 16/25] arch: arm: mach-at91: pm: Move prototypes to mutually included header

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Date:   Thu, 16 Jul 2020 14:42:31 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>
Subject: Re: [PATCH 16/25] arch: arm: mach-at91: pm: Move prototypes to
 mutually included header

On Mon, 13 Jul 2020, Alexandre Belloni wrote:

> Hi,
> 
> On 13/07/2020 15:49:21+0100, Lee Jones wrote:
> > Both the caller and the supplier's source file should have access to
> > the include file containing the prototypes.
> > 
> > Fixes the following W=1 kernel build warning(s):
> > 
> >  drivers/pinctrl/pinctrl-at91.c:1637:6: warning: no previous prototype for ‘at91_pinctrl_gpio_suspend’ [-Wmissing-prototypes]
> >  1637 | void at91_pinctrl_gpio_suspend(void)
> >  | ^~~~~~~~~~~~~~~~~~~~~~~~~
> >  drivers/pinctrl/pinctrl-at91.c:1661:6: warning: no previous prototype for ‘at91_pinctrl_gpio_resume’ [-Wmissing-prototypes]
> >  1661 | void at91_pinctrl_gpio_resume(void)
> >  | ^~~~~~~~~~~~~~~~~~~~~~~~
> > 
> > Cc: Russell King <linux@...linux.org.uk>
> > Cc: Nicolas Ferre <nicolas.ferre@...rochip.com>
> > Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> > Cc: Ludovic Desroches <ludovic.desroches@...rochip.com>
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  arch/arm/mach-at91/pm.c             | 17 ++++++-----------
> >  drivers/pinctrl/pinctrl-at91.c      |  1 +
> >  include/linux/platform_data/atmel.h |  5 +++++
> >  3 files changed, 12 insertions(+), 11 deletions(-)
> > 
> > diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
> > index 074bde64064e4..59f2a2d6fbbb8 100644
> > --- a/arch/arm/mach-at91/pm.c
> > +++ b/arch/arm/mach-at91/pm.c
> > @@ -25,17 +25,6 @@
> >  #include "generic.h"
> >  #include "pm.h"
> >  
> > -/*
> > - * FIXME: this is needed to communicate between the pinctrl driver and
> > - * the PM implementation in the machine. Possibly part of the PM
> > - * implementation should be moved down into the pinctrl driver and get
> > - * called as part of the generic suspend/resume path.
> > - */
> > -#ifdef CONFIG_PINCTRL_AT91
> > -extern void at91_pinctrl_gpio_suspend(void);
> > -extern void at91_pinctrl_gpio_resume(void);
> > -#endif
> > -
> >  struct at91_soc_pm {
> >  	int (*config_shdwc_ws)(void __iomem *shdwc, u32 *mode, u32 *polarity);
> >  	int (*config_pmc_ws)(void __iomem *pmc, u32 mode, u32 polarity);
> > @@ -325,6 +314,12 @@ static void at91_pm_suspend(suspend_state_t state)
> >  static int at91_pm_enter(suspend_state_t state)
> >  {
> >  #ifdef CONFIG_PINCTRL_AT91
> > +	/*
> > +	 * FIXME: this is needed to communicate between the pinctrl driver and
> > +	 * the PM implementation in the machine. Possibly part of the PM
> > +	 * implementation should be moved down into the pinctrl driver and get
> > +	 * called as part of the generic suspend/resume path.
> > +	 */
> >  	at91_pinctrl_gpio_suspend();
> >  #endif
> >  
> > diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
> > index 9c52130876597..37997e5ab0538 100644
> > --- a/drivers/pinctrl/pinctrl-at91.c
> > +++ b/drivers/pinctrl/pinctrl-at91.c
> > @@ -22,6 +22,7 @@
> >  #include <linux/pinctrl/pinmux.h>
> >  /* Since we request GPIOs from ourself */
> >  #include <linux/pinctrl/consumer.h>
> > +#include <linux/platform_data/atmel.h>
> >  
> >  #include "pinctrl-at91.h"
> >  #include "core.h"
> > diff --git a/include/linux/platform_data/atmel.h b/include/linux/platform_data/atmel.h
> > index 99e6069c5fd89..666ef482ea8c0 100644
> > --- a/include/linux/platform_data/atmel.h
> > +++ b/include/linux/platform_data/atmel.h
> 
> The plan is to get rid of that file so you should probably find a better
> location.

Suggestions welcome.

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