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Message-ID: <50F127A4.907@free-electrons.com> Date: Sat, 12 Jan 2013 10:06:44 +0100 From: Maxime Ripard <maxime.ripard@...e-electrons.com> To: Linus Walleij <linus.walleij@...aro.org> CC: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>, Grant Likely <grant.likely@...retlab.ca>, Rob Herring <rob.herring@...xeda.com>, Rob Landley <rob@...dley.net>, devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org Subject: Re: [PATCH 1/2] ARM: sunxi: gpio: Add Allwinner SoCs GPIO drivers Hi Linus, On 10/01/2013 12:06, Linus Walleij wrote: > On Fri, Jan 4, 2013 at 5:45 PM, Maxime Ripard > <maxime.ripard@...e-electrons.com> wrote: >> +static int __devinit >> +sunxi_pinctrl_register_gpio_ranges(struct sunxi_pinctrl *pctl) >> +{ >> + int id = 0, base = 0, npins = 1, i, prev_pin = -1; >> + struct pinctrl_gpio_range *range; >> + >> + for (i = 0; i < pctl->desc->npins; i++) { >> + const struct sunxi_desc_pin *pin = pctl->desc->pins + i; >> + unsigned pin_num = pin->pin.number; >> + >> + if (prev_pin < 0) { >> + prev_pin = pin_num; >> + base = pin_num; >> + } else if (prev_pin + 1 != pin_num) { >> + range = devm_kzalloc(pctl->dev, >> + sizeof(*range), >> + GFP_KERNEL); >> + if (!range) >> + return -ENOMEM; >> + >> + range->name = "sunxi"; >> + range->id = id; >> + range->base = base; >> + range->pin_base = base; >> + range->npins = npins; >> + >> + pinctrl_add_gpio_range(pctl->pctl_dev, range); >> + >> + id++; >> + npins = 1; >> + prev_pin = pin_num; >> + base = prev_pin; >> + } else { >> + prev_pin++; >> + npins++; >> + } >> + } >> + >> + range = devm_kzalloc(pctl->dev, sizeof(*range), >> + GFP_KERNEL); >> + if (!range) >> + return -ENOMEM; >> + >> + range->name = "sunxi"; >> + range->id = id; >> + range->base = base; >> + range->pin_base = base; >> + range->npins = npins; >> + >> + pinctrl_add_gpio_range(pctl->pctl_dev, range); >> + >> + return 0; >> +} > > Really hairy way to add ranges right? Yes... I didn't find any best way to do so. It was either that or duplicate the already existing informations we had about the pins ranges into a ranges array, which is pretty error-prone. I guess I could add some comments though. > Registering ranges from the pinctrl side is deprecated and discouraged. > > Instead register the ranges from the GPIO driver. > > Use gpiochip_add_pin_range() from the GPIO driver. > > An example is provided in > drivers/pinctrl/pinctrl-coh901.c Ok, will do. But we need to find a way to share the pins arrays between the pinctrl and gpio drivers then. Maybe add a pinctrl-sunxi-pins.h file? or merge the pinctrl and gpio drivers? I'm kind of reluctant to merging the drivers into one single messy file, but if that's the way to go, fine. > > After you have done this, you can probably get rid of this as well: > > +static int __init sunxi_gpio_init(void) > +{ > + return platform_driver_register(&sunxi_gpio_driver); > +} > +postcore_initcall(sunxi_gpio_init); > > This will become a simple module_init() if you are handling > deferred probe correctly. Ok. Thanks for your review! Maxime -- Maxime Ripard, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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