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Date: Wed, 6 May 2015 09:14:58 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Andrew Bresticker <abrestic@...omium.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
Linux MIPS <linux-mips@...ux-mips.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Ezequiel Garcia <ezequiel.garcia@...tec.com>,
James Hartley <james.hartley@...tec.com>,
James Hogan <james.hogan@...tec.com>,
Damien Horsley <Damien.Horsley@...tec.com>,
Govindraj Raja <govindraj.raja@...tec.com>,
Kevin Cernekee <cernekee@...omium.org>
Subject: Re: [PATCH V4 2/2] pinctrl: Add Pistachio SoC pin control driver
Hi Andrew and sorry for a slow review process, I've been
overloaded :(
On Wed, Apr 29, 2015 at 3:13 AM, Andrew Bresticker
<abrestic@...omium.org> wrote:
> Add a driver for the pin controller present on the IMG Pistachio SoC.
> This driver provides pinmux and pinconfig operations as well as GPIO
> and IRQ chips for the GPIO banks.
>
> Signed-off-by: Damien Horsley <Damien.Horsley@...tec.com>
> Signed-off-by: Govindraj Raja <govindraj.raja@...tec.com>
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...tec.com>
> Signed-off-by: Kevin Cernekee <cernekee@...omium.org>
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> ---
> Changes from v3:
> - Addressed review comments from Ezequiel.
Overall this is a very very nice looking driver so expect it to
be merged after addressing or answering my last few
concerns.
> +config PINCTRL_PISTACHIO
> + def_bool y if MACH_PISTACHIO
> + select PINMUX
> + select GENERIC_PINCONF
> + select GPIOLIB_IRQCHIP
I think you also need
depends on / select GPIOLIB
select OF_GPIO
x86_64 allmodconfig is usually the best way to test
if your GPIOs and pin control fragments are correctly Kconfig:ed.
> +#define PADS_DRIVE_STRENGTH_2MA 0x0
> +#define PADS_DRIVE_STRENGTH_4MA 0x1
> +#define PADS_DRIVE_STRENGTH_8MA 0x2
> +#define PADS_DRIVE_STRENGTH_12MA 0x3
Thanks for being clear on the defines and not using magic
values. This makes things so much easier for people
using and maintaining the driver!
> +#define GPIO_BANK(_bank, _pin_base, _npins) \
> + { \
> + .gpio_chip = { \
> + .label = "GPIO" #_bank, \
> + .request = pistachio_gpio_request, \
> + .free = pistachio_gpio_free, \
> + .get_direction = pistachio_gpio_get_direction, \
> + .direction_input = pistachio_gpio_direction_input, \
> + .direction_output = pistachio_gpio_direction_output, \
> + .get = pistachio_gpio_get, \
> + .set = pistachio_gpio_set, \
> + .base = _pin_base, \
> + .ngpio = _npins, \
> + }, \
> + .irq_chip = { \
> + .name = "GPIO" #_bank, \
> + .irq_startup = pistachio_gpio_irq_startup, \
> + .irq_ack = pistachio_gpio_irq_ack, \
> + .irq_mask = pistachio_gpio_irq_mask, \
> + .irq_unmask = pistachio_gpio_irq_unmask, \
> + .irq_set_type = pistachio_gpio_irq_set_type, \
> + }, \
> + .gpio_range = { \
> + .name = "GPIO" #_bank, \
> + .id = _bank, \
> + .base = _pin_base, \
> + .pin_base = _pin_base, \
> + .npins = _npins, \
> + }, \
> + }
This -gpio_range is the only thing that bothers me a little, combined with
this:
> + bank->gpio_range.gc = &bank->gpio_chip;
> + pinctrl_add_gpio_range(pctl->pctldev, &bank->gpio_range);
Because it adds the ranges from the pinctrl side instead of
doing it from the gpiochip side using
gpiochip_add_pin_range() or gpiochip_add_pingroup_range().
Have you tried using those (from <linux/gpio/driver.h> instead?
They have the upside that .base is taken from the gpio_chip
meaning it is unnecessary to define .base for the gpiochip
too and you can just go for what gpiolib dynamically assigns
for you.
> + pinctrl_remove_gpio_range(pctl->pctldev, &bank->gpio_range);
And this will then be done automatically by gpiochio_remove().
> +static int __init pistachio_pinctrl_register(void)
> +{
> + return platform_driver_register(&pistachio_pinctrl_driver);
> +}
> +arch_initcall(pistachio_pinctrl_register);
Is it necessary to have it registered so early?
Apart from these, as noted it looks very nice.
Yours,
Linus Walleij
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