| Message ID | 1435650327-2542-5-git-send-email-geert+renesas@glider.be |
|---|---|
| State | New |
| Headers | show |
Hi Geert, Thank you for the patch. On Tuesday 30 June 2015 09:45:24 Geert Uytterhoeven wrote: > On platforms where the PFC/GPIO controller is instantiated from DT, the > mapping between GPIOs and pins is set up using the "gpio-ranges" > property in DT. > > Hence stop setting up the mapping from C code on DT platforms. > This code is still used for SH or ARM-legacy platforms. > > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > --- > drivers/pinctrl/sh-pfc/gpio.c | 36 ++++++++++++++++++++---------------- > 1 file changed, 20 insertions(+), 16 deletions(-) > > diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c > index ba353735ecf2be9a..1be118e4865fd3f8 100644 > --- a/drivers/pinctrl/sh-pfc/gpio.c > +++ b/drivers/pinctrl/sh-pfc/gpio.c > @@ -379,22 +379,26 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc) > > pfc->gpio = chip; > > - /* Register the GPIO to pin mappings. As pins with GPIO ports must come > - * first in the ranges, skip the pins without GPIO ports by stopping at > - * the first range that contains such a pin. > - */ > - for (i = 0; i < pfc->nr_ranges; ++i) { > - const struct sh_pfc_pin_range *range = &pfc->ranges[i]; > - > - if (range->start >= pfc->nr_gpio_pins) > - break; > - > - ret = gpiochip_add_pin_range(&chip->gpio_chip, > - dev_name(pfc->dev), > - range->start, range->start, > - range->end - range->start + 1); > - if (ret < 0) > - return ret; > + if (IS_ENABLED(CONFIG_SUPERH) || > + IS_ENABLED(CONFIG_ARCH_SHMOBILE_LEGACY)) { I'd prefer checking IS_ENABLED(CONFIG_OF) && pfc->dev->of_node as that doesn't explicitly depend on the platform type. As the code after this if block also don't need to run on non-DT platforms, how about just using if (IS_ENABLED(CONFIG_OF) && pfc->dev->of_node) return 0; ? > + /* > + * Register the GPIO to pin mappings. As pins with GPIO ports > + * must come first in the ranges, skip the pins without GPIO > + * ports by stopping at the first range that contains such a > + * pin. > + */ > + for (i = 0; i < pfc->nr_ranges; ++i) { > + const struct sh_pfc_pin_range *range = &pfc->ranges[i]; > + > + if (range->start >= pfc->nr_gpio_pins) > + break; > + > + ret = gpiochip_add_pin_range(&chip->gpio_chip, > + dev_name(pfc->dev), range->start, range->start, > + range->end - range->start + 1); > + if (ret < 0) > + return ret; > + } > } > > /* Register the function GPIOs chip. */
Hi Laurent, On Tue, Jun 30, 2015 at 11:30 AM, Laurent Pinchart <laurent.pinchart@ideasonboard.com> wrote: > On Tuesday 30 June 2015 09:45:24 Geert Uytterhoeven wrote: >> On platforms where the PFC/GPIO controller is instantiated from DT, the >> mapping between GPIOs and pins is set up using the "gpio-ranges" >> property in DT. >> >> Hence stop setting up the mapping from C code on DT platforms. >> This code is still used for SH or ARM-legacy platforms. >> >> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> >> --- >> drivers/pinctrl/sh-pfc/gpio.c | 36 ++++++++++++++++++++---------------- >> 1 file changed, 20 insertions(+), 16 deletions(-) >> >> diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c >> index ba353735ecf2be9a..1be118e4865fd3f8 100644 >> --- a/drivers/pinctrl/sh-pfc/gpio.c >> +++ b/drivers/pinctrl/sh-pfc/gpio.c >> @@ -379,22 +379,26 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc) >> >> pfc->gpio = chip; >> >> - /* Register the GPIO to pin mappings. As pins with GPIO ports must come >> - * first in the ranges, skip the pins without GPIO ports by stopping at >> - * the first range that contains such a pin. >> - */ >> - for (i = 0; i < pfc->nr_ranges; ++i) { >> - const struct sh_pfc_pin_range *range = &pfc->ranges[i]; >> - >> - if (range->start >= pfc->nr_gpio_pins) >> - break; >> - >> - ret = gpiochip_add_pin_range(&chip->gpio_chip, >> - dev_name(pfc->dev), >> - range->start, range->start, >> - range->end - range->start + 1); >> - if (ret < 0) >> - return ret; >> + if (IS_ENABLED(CONFIG_SUPERH) || >> + IS_ENABLED(CONFIG_ARCH_SHMOBILE_LEGACY)) { > > I'd prefer checking IS_ENABLED(CONFIG_OF) && pfc->dev->of_node as that doesn't > explicitly depend on the platform type. Note that CONFIG_OF is also set for ARM-legacy (and soon for SH). But that's a minor problem. But due to the runtime check on pfc->dev->of_node, the unused code below won't be left out by the compiler, and I want to get rid of that code. The platform check make it clear when the code can be removed. > As the code after this if block also don't need to run on non-DT platforms, > how about just using > > if (IS_ENABLED(CONFIG_OF) && pfc->dev->of_node) > return 0; > > ? Early return is indeed an option, as we don't need the function GPIOs on DT platforms. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Geert, On Tuesday 30 June 2015 11:44:24 Geert Uytterhoeven wrote: > On Tue, Jun 30, 2015 at 11:30 AM, Laurent Pinchart wrote: > > On Tuesday 30 June 2015 09:45:24 Geert Uytterhoeven wrote: > >> On platforms where the PFC/GPIO controller is instantiated from DT, the > >> mapping between GPIOs and pins is set up using the "gpio-ranges" > >> property in DT. > >> > >> Hence stop setting up the mapping from C code on DT platforms. > >> This code is still used for SH or ARM-legacy platforms. > >> > >> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > >> --- > >> > >> drivers/pinctrl/sh-pfc/gpio.c | 36 ++++++++++++++++++++---------------- > >> 1 file changed, 20 insertions(+), 16 deletions(-) > >> > >> diff --git a/drivers/pinctrl/sh-pfc/gpio.c > >> b/drivers/pinctrl/sh-pfc/gpio.c > >> index ba353735ecf2be9a..1be118e4865fd3f8 100644 > >> --- a/drivers/pinctrl/sh-pfc/gpio.c > >> +++ b/drivers/pinctrl/sh-pfc/gpio.c > >> @@ -379,22 +379,26 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc) > >> > >> pfc->gpio = chip; > >> > >> - /* Register the GPIO to pin mappings. As pins with GPIO ports must > >> come > >> - * first in the ranges, skip the pins without GPIO ports by > >> stopping at > >> - * the first range that contains such a pin. > >> - */ > >> - for (i = 0; i < pfc->nr_ranges; ++i) { > >> - const struct sh_pfc_pin_range *range = &pfc->ranges[i]; > >> - > >> - if (range->start >= pfc->nr_gpio_pins) > >> - break; > >> - > >> - ret = gpiochip_add_pin_range(&chip->gpio_chip, > >> - dev_name(pfc->dev), > >> - range->start, range->start, > >> - range->end - range->start + > >> 1); > >> - if (ret < 0) > >> - return ret; > >> + if (IS_ENABLED(CONFIG_SUPERH) || > >> + IS_ENABLED(CONFIG_ARCH_SHMOBILE_LEGACY)) { > > > > I'd prefer checking IS_ENABLED(CONFIG_OF) && pfc->dev->of_node as that > > doesn't explicitly depend on the platform type. > > Note that CONFIG_OF is also set for ARM-legacy (and soon for SH). But that's > a minor problem. But due to the runtime check on pfc->dev->of_node, the > unused code below won't be left out by the compiler, and I want to get rid > of that code. > > The platform check make it clear when the code can be removed. Not any time soon I'm afraid as arch/sh won't fully move to DT in the near future, but ARCH_SHMOBILE_LEGACY should go away soon, so I'm fine with compile-time optimization. > > As the code after this if block also don't need to run on non-DT > > platforms, > > how about just using > > > > if (IS_ENABLED(CONFIG_OF) && pfc->dev->of_node) > > > > return 0; > > > > ? > > Early return is indeed an option, as we don't need the function GPIOs on > DT platforms.
diff --git a/drivers/pinctrl/sh-pfc/gpio.c b/drivers/pinctrl/sh-pfc/gpio.c index ba353735ecf2be9a..1be118e4865fd3f8 100644 --- a/drivers/pinctrl/sh-pfc/gpio.c +++ b/drivers/pinctrl/sh-pfc/gpio.c @@ -379,22 +379,26 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc) pfc->gpio = chip; - /* Register the GPIO to pin mappings. As pins with GPIO ports must come - * first in the ranges, skip the pins without GPIO ports by stopping at - * the first range that contains such a pin. - */ - for (i = 0; i < pfc->nr_ranges; ++i) { - const struct sh_pfc_pin_range *range = &pfc->ranges[i]; - - if (range->start >= pfc->nr_gpio_pins) - break; - - ret = gpiochip_add_pin_range(&chip->gpio_chip, - dev_name(pfc->dev), - range->start, range->start, - range->end - range->start + 1); - if (ret < 0) - return ret; + if (IS_ENABLED(CONFIG_SUPERH) || + IS_ENABLED(CONFIG_ARCH_SHMOBILE_LEGACY)) { + /* + * Register the GPIO to pin mappings. As pins with GPIO ports + * must come first in the ranges, skip the pins without GPIO + * ports by stopping at the first range that contains such a + * pin. + */ + for (i = 0; i < pfc->nr_ranges; ++i) { + const struct sh_pfc_pin_range *range = &pfc->ranges[i]; + + if (range->start >= pfc->nr_gpio_pins) + break; + + ret = gpiochip_add_pin_range(&chip->gpio_chip, + dev_name(pfc->dev), range->start, range->start, + range->end - range->start + 1); + if (ret < 0) + return ret; + } } /* Register the function GPIOs chip. */
On platforms where the PFC/GPIO controller is instantiated from DT, the mapping between GPIOs and pins is set up using the "gpio-ranges" property in DT. Hence stop setting up the mapping from C code on DT platforms. This code is still used for SH or ARM-legacy platforms. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/pinctrl/sh-pfc/gpio.c | 36 ++++++++++++++++++++---------------- 1 file changed, 20 insertions(+), 16 deletions(-)