[PATCH 07/21] ARM: shmobile: kzm9g: reference: Register pinctrl mappings for I2C

[horms@verge.net.au (Simon Horman)]

On Wed, Feb 13, 2013 at 05:03:28PM +0100, Laurent Pinchart wrote:
> Hi Simon,
> 
> Thanks you for the patch.
> 
> On Wednesday 13 February 2013 11:44:43 Simon Horman wrote:
> > Replace the GPIO-based I2C pinmux configuration by pinctrl mappings.
> > 
> > This change is for the kzm9g reference DT implementation and
> > is in keeping with a similar change for the default kzm9g implementation
> > made by Laurent Pinchart.
> > 
> > This change also adds a sh73a0_pinmux_init() call to kzm_init()
> > which was previously missing as it was not needed (or at least not
> > needed in practice) for the minimal board configuration supplied
> > by the reference DT implementation. The call to sh73a0_pinmux_init()
> > will be removed by a subsequent patch to initialise pinmus using
> > device tree.
> > 
> > Reported-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> > Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> > Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
> > ---
> >  arch/arm/mach-shmobile/board-kzm9g-reference.c |   12 ++++++++----
> >  1 file changed, 8 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/arm/mach-shmobile/board-kzm9g-reference.c
> > b/arch/arm/mach-shmobile/board-kzm9g-reference.c index 6a1222e..642bb7b
> > 100644
> > --- a/arch/arm/mach-shmobile/board-kzm9g-reference.c
> > +++ b/arch/arm/mach-shmobile/board-kzm9g-reference.c
> > @@ -26,12 +26,18 @@
> >  #include <linux/irq.h>
> >  #include <linux/input.h>
> >  #include <linux/of_platform.h>
> > +#include <linux/pinctrl/machine.h>
> >  #include <mach/sh73a0.h>
> >  #include <mach/common.h>
> >  #include <asm/hardware/cache-l2x0.h>
> >  #include <asm/mach-types.h>
> >  #include <asm/mach/arch.h>
> > 
> > +static const struct pinctrl_map kzm_pinctrl_map[] = {
> > +	PIN_MAP_MUX_GROUP_DEFAULT("i2c-sh_mobile.3", "pfc-sh73a0",
> > +				  "i2c3_1", "i2c3"),
> > +};
> > +
> >  static void __init kzm_init(void)
> >  {
> >  	/* enable SCIFA4 */
> > @@ -52,16 +58,14 @@ static void __init kzm_init(void)
> >  	gpio_request(GPIO_FN_MMCD0_6_PU,	NULL);
> >  	gpio_request(GPIO_FN_MMCD0_7_PU,	NULL);
> > 
> > -	/* I2C 3 */
> > -	gpio_request(GPIO_FN_PORT27_I2C_SCL3, NULL);
> > -	gpio_request(GPIO_FN_PORT28_I2C_SDA3, NULL);
> > -
> >  #ifdef CONFIG_CACHE_L2X0
> >  	/* Early BRESP enable, Shared attribute override enable, 64K*8way */
> >  	l2x0_init(IOMEM(0xf0100000), 0x40460000, 0x82000fff);
> >  #endif
> > 
> > +	sh73a0_pinmux_init();
> 
> You should initialize pinmuxing before using any of the GPIO functions, so 
> this call should be moved near the top of kzm_init().
> 
> >  	sh73a0_add_standard_devices_dt();
> > +	pinctrl_register_mappings(kzm_pinctrl_map, ARRAY_SIZE(kzm_pinctrl_map));
> 
> You should register mappings before initializing pinmuxing, otherwise the 
> default configurations won't be applied as they won't be registered when the 
> PFC device is registered. This call should thus be moved before the 
> sh73a0_pinmux_init() call.

Thanks. I have sorted that out in my tree as Guennadi had supplied
a patch to add sh73a0_pinmux_init() and pinctrl_register_mappings()
calls in the correct locations and I rebased on top of that.

Its a shame we seem to have this co-dependency between kzm9g-reference
and pinmux. At this stage it just looks like we will need to tread
carefully when merging.