linux-kernel - Re: [PATCH V2 3/3] pinctrl: Add Pistachio SoC pin control driver

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Date:	Tue, 31 Mar 2015 10:10:15 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Andrew Bresticker <abrestic@...omium.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>, devicetree@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-mips@...ux-mips.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 V2 3/3] pinctrl: Add Pistachio SoC pin control driver

The patch adds a mismatch between the Kconfig symbol (a bool) and the
code (which suggests that a modular build is also possible).

On Mon, 2015-03-30 at 16:16 -0700, Andrew Bresticker wrote:
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig

> +config PINCTRL_PISTACHIO
> +	def_bool y if MACH_PISTACHIO

This adds a bool symbol.

> +	select PINMUX
> +	select GENERIC_PINCONF
> +	select GPIOLIB_IRQCHIP

> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile

> +obj-$(CONFIG_PINCTRL_PISTACHIO)	+= pinctrl-pistachio.o

So pinctrl-pistachio.o will never be part of a module.

> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-pistachio.c

> +#include <linux/module.h>

Chances are this include is not needed.

> +static struct pinctrl_desc pistachio_pinctrl_desc = {
> +	.name = "pistachio-pinctrl",
> +	.pctlops = &pistachio_pinctrl_ops,
> +	.pmxops = &pistachio_pinmux_ops,
> +	.confops = &pistachio_pinconf_ops,
> +	.owner = THIS_MODULE,

According to include/linux/export.h THIS_MODULE is equivalent to NULL,
so this can probably be dropped.

> +};

> +#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,				\
> +			.owner = THIS_MODULE,				\

Ditto.

> +		},							\
> +		.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,				\
> +		},							\
> +	}

> +MODULE_DEVICE_TABLE(of, pistachio_pinctrl_of_match);

According to include/linux/module.h this will be preprocessed away.

> +module_platform_driver(pistachio_pinctrl_driver);

This seems to be equivalent to adding a wrapper that does
    platform_driver_register(&pistachio_pinctrl_driver);

and marking that wrapper with device_initcall(). I don't think there's
one line macro to do that.

> +MODULE_AUTHOR("Andrew Bresticker <abrestic@...omium.org>");
> +MODULE_AUTHOR("Damien Horsley <Damien.Horsley@...tec.com>");
> +MODULE_DESCRIPTION("Pistachio pinctrl driver");
> +MODULE_LICENSE("GPL v2");

These macros will (basically) be preprocessed away.


Paul Bolle

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