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SubjectRE: [RFC PATCH v2 2/4] pinctrl: imx: add pinmux imx driver
Date
> -----Original Message-----
> From: Guo Shawn-R65073
> Sent: Thursday, December 15, 2011 4:18 PM
> To: Dong Aisheng-B29396
> Cc: linux-kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
> linus.walleij@stericsson.com; s.hauer@pengutronix.de;
> kernel@pengutronix.de; grant.likely@secretlab.ca; rob.herring@calxeda.com
> Subject: Re: [RFC PATCH v2 2/4] pinctrl: imx: add pinmux imx driver
> Importance: High
>
> On Thu, Dec 15, 2011 at 12:03:40AM +0800, Dong Aisheng wrote:
> > The driver contains the initial support for imx53 and imx6q.
> >
> > Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
> > Cc: Linus Walleij <linus.walleij@linaro.org>
> > Cc: Sascha Hauer <s.hauer@pengutronix.de>
> > Cc: Shawn Guo <shanw.guo@freescale.com>
> > ---
> > drivers/pinctrl/Kconfig | 20 ++
> > drivers/pinctrl/Makefile | 3 +
> > drivers/pinctrl/pinmux-imx-core.c | 435
> ++++++++++++++++++++++++++++++++++++
> > drivers/pinctrl/pinmux-imx-core.h | 86 +++++++
> > drivers/pinctrl/pinmux-imx53.c | 443
> +++++++++++++++++++++++++++++++++++++
> > drivers/pinctrl/pinmux-imx6q.c | 433
> ++++++++++++++++++++++++++++++++++++
> > 6 files changed, 1420 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig index
> > e17e2f8..268c212 100644
> > --- a/drivers/pinctrl/Kconfig
> > +++ b/drivers/pinctrl/Kconfig
> > @@ -20,6 +20,26 @@ config DEBUG_PINCTRL
> > help
> > Say Y here to add some extra checks and diagnostics to PINCTRL
> calls.
> >
> > +config PINMUX_IMX
> > + bool "Freescale IMX core pinmux driver"
> > + depends on ARCH_MXC
> > +
> > +config PINMUX_IMX53
> > + bool "IMX53 pinmux driver"
> > + depends on ARCH_MX5
> > + select PINMUX
> > + select PINMUX_IMX
> > + help
> > + Say Y here to enable the imx6q pinmux driver
>
> s/imx6q/imx53
>
Acked.

> > +
> > +config PINMUX_IMX6Q
> > + bool "IMX6Q pinmux driver"
> > + depends on SOC_IMX6Q
> > + select PINMUX
> > + select PINMUX_IMX
> > + help
> > + Say Y here to enable the imx6q pinmux driver
> > +
>
> [...]
>
> > +#ifdef CONFIG_OF
> > +static int __devinit imx_pmx_parse_functions(struct device_node *np,
> > + struct imx_pinctrl_info *info, u32 num) {
> > + struct imx_pmx_func *function;
> > + struct imx_pin_group *group;
> > + int ret, len;
> > +
> > + dev_dbg(info->dev, "parse function %d\n", num);
> > +
> > + group = &info->groups[num];
> > + function = &info->functions[num];
> > +
> > + /* Initialise group */
> > + ret = of_property_read_string(np, "grp_name", &group->name);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get grp_name\n");
> > + return ret;
> > + }
> > +
> > + ret = of_property_read_u32(np, "num_pins", &group->num_pins);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get num_pins\n");
> > + return ret;
> > + }
> > +
> > + ret = of_property_read_u32(np, "num_mux", &group->num_mux);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get num_mux\n");
> > + return ret;
> > + }
> > +
> > + if (group->num_pins != group->num_mux)
> > + return -EINVAL;
> > +
> > + group->pins = devm_kzalloc(info->dev, group->num_pins *
> sizeof(unsigned int),
> > + GFP_KERNEL);
> > + group->mux_mode = devm_kzalloc(info->dev, group->num_mux *
> sizeof(unsigned int),
> > + GFP_KERNEL);
> > + if (!group->pins || !group->mux_mode)
> > + return -ENOMEM;
> > +
> > + /* sanity check */
> > + if (of_get_property(np, "grp_pins", &len) &&
> > + len != group->num_pins * sizeof(unsigned int)) {
>
> Since we can figure out the 'num_pins' here, why do we bother to encode
> it in dts?
>
Since the pin group is easily to define wrongly by mistake when pins are many,
I would add num_pins in dts to double check in driver to improve the code
Stability.

> > + dev_err(info->dev, "wrong pins number?\n");
> > + return -EINVAL;
> > + }
> > +
> > + if (of_get_property(np, "grp_mux", &len) &&
> > + len != group->num_mux * sizeof(unsigned int)) {
>
> ditto
>
> > + dev_err(info->dev, "wrong pin mux number?\n");
> > + return -EINVAL;
> > + }
>
> --
> Regards,
> Shawn



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