linux-kernel - Re: [PATCH 2/4] sh-pfc: Add emev2 pinmux support

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Message-ID: <20150117181159.GA11372@bigcity.berto.se>
Date:	Sat, 17 Jan 2015 19:11:59 +0100
From:	Niklas Söderlund <niso@....se>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	linux-kernel@...r.kernel.org, linus.walleij@...aro.org,
	devicetree@...r.kernel.org, linux-sh@...r.kernel.org,
	magnus.damm@...il.com
Subject: Re: [PATCH 2/4] sh-pfc: Add emev2 pinmux support

Hi Laurent,

Thanks for your review. I will send a updated patch shortly.

Regards
// Niklas

* Laurent Pinchart <laurent.pinchart@...asonboard.com> [2015-01-13 16:27:06 +0200]:

> Hi Niklas,
>
> Thank you for the patch.
>
> On Friday 12 December 2014 21:01:35 Niklas Söderlund wrote:
> > Add PFC support for the EMMA Mobile EV2 SoC including pin groups for
> > on-chip devices.
> >
> > Signed-off-by: Niklas Söderlund <niso@....se>
> > ---
> >  .../bindings/pinctrl/renesas,pfc-pinctrl.txt       |    1 +
> >  drivers/pinctrl/sh-pfc/Kconfig                     |    5 +
> >  drivers/pinctrl/sh-pfc/Makefile                    |    1 +
> >  drivers/pinctrl/sh-pfc/core.c                      |    9 +
> >  drivers/pinctrl/sh-pfc/core.h                      |    1 +
> >  drivers/pinctrl/sh-pfc/pfc-emev2.c                 | 1915 +++++++++++++++++
> >  6 files changed, 1932 insertions(+)
> >  create mode 100644 drivers/pinctrl/sh-pfc/pfc-emev2.c
>
> [snip]
>
> > diff --git a/drivers/pinctrl/sh-pfc/pfc-emev2.c
> > b/drivers/pinctrl/sh-pfc/pfc-emev2.c new file mode 100644
> > index 0000000..22c9e15
> > --- /dev/null
> > +++ b/drivers/pinctrl/sh-pfc/pfc-emev2.c
>
> [snip]
>
> > +#define CPU_ALL_PORT(fn, sfx)						\
> > +	PORT_GP_32(0, fn, sfx),						\
> > +	PORT_GP_32(1, fn, sfx),						\
> > +	PORT_GP_32(2, fn, sfx),						\
> > +	PORT_GP_32(3, fn, sfx),						\
> > +	PORT_GP_32(4, fn, sfx)
>
> GPIOs are numbered linearly in the datasheet, not using a bank number.
> Shouldn't that be reflected here ? Additionally the chip has 159 GPIOs, and
> you define 160 of them.
>
> [snip]
>
> I'm afraid I can't review all the data tables, I'll trust you on that :-)
>
> > +/* Pin numbers for pins without a corresponding GPIO port number are
> > computed
> > + * from the row and column numbers with a 1000 offset to avoid collisions
> > with
> > + * GPIO port numbers. */
> > +#define PIN_NUMBER(row, col)            (1000+((row)-1)*25+(col)-1)
>
> The chip is an 23x23 BGA, shouldn't you multiply by 23 instead of 25 ?
>
> [snip]
>
> > +#define EMEV_MUX_PIN(name, pin, mark) \
> > +	static const unsigned int name##_pins[] = { pin }; \
> > +	static const unsigned int name##_mux[] = { mark##_MARK }
>
> [snip]
>
> > +/* = [ IIC ] ============== */
> > +EMEV_MUX_PIN(iic0_scl, 44, IIC0_SCL);
> > +EMEV_MUX_PIN(iic0_sda, 45, IIC0_SDA);
>
> [snip]
>
> > +static const struct sh_pfc_pin_group pinmux_groups[] = {
>
> [snip]
>
> > +	SH_PFC_PIN_GROUP(iic0_scl),
> > +	SH_PFC_PIN_GROUP(iic0_sda),
>
> [snip]
>
> > +};
>
> [snip]
>
> > +static const char * const iic0_groups[] = {
> > +	"iic0_scl",
> > +	"iic0_sda",
> > +};
>
> (Taking IIC0 as an example)
>
> You're defining one pin group per pin. While this isn't an invalid decision,
> the sh-pfc driver tried so far to group related pins in the same group. For
> instance, with IIC0, SCL and SDA can't be used independently, so you always
> need to request both. They could thus be grouped together. Is there a reason
> not to follow the same design for EMEV2 ?
>
> [snip]
>
> > +static const struct sh_pfc_function pinmux_functions[] = {
> > +	SH_PFC_FUNCTION(jtag),
> > +	SH_PFC_FUNCTION(lcd),
> > +	SH_PFC_FUNCTION(yuv),
> > +	SH_PFC_FUNCTION(tp33),
> > +	SH_PFC_FUNCTION(iic0),
> > +	SH_PFC_FUNCTION(iic1),
> > +	SH_PFC_FUNCTION(uart1),
> > +	SH_PFC_FUNCTION(uart2),
> > +	SH_PFC_FUNCTION(uart3),
> > +	SH_PFC_FUNCTION(sd),
> > +	SH_PFC_FUNCTION(sdi0),
> > +	SH_PFC_FUNCTION(sdi1),
> > +	SH_PFC_FUNCTION(sdi2),
> > +	SH_PFC_FUNCTION(ab),
> > +	SH_PFC_FUNCTION(dtv),
> > +	SH_PFC_FUNCTION(cf),
> > +	SH_PFC_FUNCTION(usi0),
> > +	SH_PFC_FUNCTION(usi1),
> > +	SH_PFC_FUNCTION(usi2),
> > +	SH_PFC_FUNCTION(usi3),
> > +	SH_PFC_FUNCTION(usi4),
> > +	SH_PFC_FUNCTION(usi5),
> > +	SH_PFC_FUNCTION(ntsc),
> > +	SH_PFC_FUNCTION(cam),
> > +	SH_PFC_FUNCTION(hsi),
> > +};
>
> Could you please order the functions alphabetically, here and above ?
>
> [snip]
>
> --
> Regards,
>
> Laurent Pinchart
>
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