linux-kernel - Re: [PATCH v4 4/9] power: reset: Add AT91RM9200 reset driver

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Date:	Thu, 05 Mar 2015 20:49:14 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Lee Jones <lee.jones@...aro.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 4/9] power: reset: Add AT91RM9200 reset driver

On Thu, 2015-03-05 at 16:49 +0100, Alexandre Belloni wrote:
> --- a/drivers/power/reset/Kconfig
> +++ b/drivers/power/reset/Kconfig
> @@ -30,6 +30,13 @@ config POWER_RESET_AT91_RESET
>  	  This driver supports restart for Atmel AT91SAM9 and SAMA5
>  	  SoCs
>  
> +config POWER_RESET_AT91RM9200_RESET
> +	bool "Atmel AT91RM9200 reset driver"

This adds a bool symbol.

> +	depends on ARCH_AT91 && MFD_SYSCON
> +	default SOC_AT91RM9200
> +	help
> +	  This driver supports restart for Atmel AT91RM9200.
> +
>  config POWER_RESET_AXXIA
>  	bool "LSI Axxia reset driver"
>  	depends on ARCH_AXXIA
> diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
> index 11de15bae52e..96e972bbb922 100644
> --- a/drivers/power/reset/Makefile
> +++ b/drivers/power/reset/Makefile
> @@ -1,6 +1,7 @@
>  obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o
>  obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o
>  obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o
> +obj-$(CONFIG_POWER_RESET_AT91RM9200_RESET) += at91rm9200-reset.o

This objectfile will never be modular.

>  obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o
>  obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o
>  obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
> diff --git a/drivers/power/reset/at91rm9200-reset.c b/drivers/power/reset/at91rm9200-reset.c
> new file mode 100644
> index 000000000000..b739ac82b9c9
> --- /dev/null
> +++ b/drivers/power/reset/at91rm9200-reset.c
> @@ -0,0 +1,72 @@

> +#include <linux/module.h>

Is this needed?

> +static struct platform_driver at91rm9200_reset_driver = {
> +	.probe = at91rm9200_reset_probe,
> +	.driver = {
> +		.name = "at91rm9200-reset",
> +		.of_match_table = at91rm9200_reset_of_match,
> +	},
> +};
> +module_platform_driver(at91rm9200_reset_driver);

This should, perhaps, be replaced by a wrapper that calls
    platform_driver_register(at91rm9200_reset_driver)

while that wrapper is, well, called through
    device_initcall()

or something similar. I didn't test this suggestion.

> +MODULE_ALIAS("platform:at91rm9200-reset");
> +MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@...e-electrons.com>");
> +MODULE_DESCRIPTION("Atmel at91rm9200 System Timer Reset driver");
> +MODULE_LICENSE("GPL v2");

All these macros will be, basically, preprocessed away.


Paul Bolle

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