Re: [PATCH 1/4] PM / MIPS: Use struct syscore_ops instead of sysdevsfor PM (v2)

[Ralf Baechle]

Thanks, applied.  This should also got into 3.0-stable.

  Ralf
On Fri, Jun 03, 2011 at 03:06:48AM +0200, Lars-Peter Clausen wrote:

> From: Rafael J. Wysocki <rjw@xxxxxxx>
> 
> Convert some MIPS architecture's code to using struct syscore_ops
> objects for power management instead of sysdev classes and sysdevs.
> 
> This simplifies the code and reduces the kernel's memory footprint.
> It also is necessary for removing sysdevs from the kernel entirely in
> the future.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
> Acked-and-tested-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
> Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
> ---
>  arch/mips/jz4740/gpio.c |   52 +++++++++++++++++++---------------------------
>  1 files changed, 22 insertions(+), 30 deletions(-)
> 
> diff --git a/arch/mips/jz4740/gpio.c b/arch/mips/jz4740/gpio.c
> index 73031f7..4397972 100644
> --- a/arch/mips/jz4740/gpio.c
> +++ b/arch/mips/jz4740/gpio.c
> @@ -18,7 +18,7 @@
>  #include <linux/init.h>
>  
>  #include <linux/spinlock.h>
> -#include <linux/sysdev.h>
> +#include <linux/syscore_ops.h>
>  #include <linux/io.h>
>  #include <linux/gpio.h>
>  #include <linux/delay.h>
> @@ -86,7 +86,6 @@ struct jz_gpio_chip {
>  	spinlock_t lock;
>  
>  	struct gpio_chip gpio_chip;
> -	struct sys_device sysdev;
>  };
>  
>  static struct jz_gpio_chip jz4740_gpio_chips[];
> @@ -459,49 +458,47 @@ static struct jz_gpio_chip jz4740_gpio_chips[] = {
>  	JZ4740_GPIO_CHIP(D),
>  };
>  
> -static inline struct jz_gpio_chip *sysdev_to_chip(struct sys_device *dev)
> +static void jz4740_gpio_suspend_chip(struct jz_gpio_chip *chip)
>  {
> -	return container_of(dev, struct jz_gpio_chip, sysdev);
> +	chip->suspend_mask = readl(chip->base + JZ_REG_GPIO_MASK);
> +	writel(~(chip->wakeup), chip->base + JZ_REG_GPIO_MASK_SET);
> +	writel(chip->wakeup, chip->base + JZ_REG_GPIO_MASK_CLEAR);
>  }
>  
> -static int jz4740_gpio_suspend(struct sys_device *dev, pm_message_t state)
> +static int jz4740_gpio_suspend(void)
>  {
> -	struct jz_gpio_chip *chip = sysdev_to_chip(dev);
> +	int i;
>  
> -	chip->suspend_mask = readl(chip->base + JZ_REG_GPIO_MASK);
> -	writel(~(chip->wakeup), chip->base + JZ_REG_GPIO_MASK_SET);
> -	writel(chip->wakeup, chip->base + JZ_REG_GPIO_MASK_CLEAR);
> +	for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); i++)
> +		jz4740_gpio_suspend_chip(&jz4740_gpio_chips[i]);
>  
>  	return 0;
>  }
>  
> -static int jz4740_gpio_resume(struct sys_device *dev)
> +static void jz4740_gpio_resume_chip(struct jz_gpio_chip *chip)
>  {
> -	struct jz_gpio_chip *chip = sysdev_to_chip(dev);
>  	uint32_t mask = chip->suspend_mask;
>  
>  	writel(~mask, chip->base + JZ_REG_GPIO_MASK_CLEAR);
>  	writel(mask, chip->base + JZ_REG_GPIO_MASK_SET);
> +}
>  
> -	return 0;
> +static void jz4740_gpio_resume(void)
> +{
> +	int i;
> +
> +	for (i = ARRAY_SIZE(jz4740_gpio_chips) - 1; i >= 0 ; i--)
> +		jz4740_gpio_resume_chip(&jz4740_gpio_chips[i]);
>  }
>  
> -static struct sysdev_class jz4740_gpio_sysdev_class = {
> -	.name = "gpio",
> +static struct syscore_ops jz4740_gpio_syscore_ops = {
>  	.suspend = jz4740_gpio_suspend,
>  	.resume = jz4740_gpio_resume,
>  };
>  
> -static int jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
> +static void jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
>  {
> -	int ret, irq;
> -
> -	chip->sysdev.id = id;
> -	chip->sysdev.cls = &jz4740_gpio_sysdev_class;
> -	ret = sysdev_register(&chip->sysdev);
> -
> -	if (ret)
> -		return ret;
> +	int irq;
>  
>  	spin_lock_init(&chip->lock);
>  
> @@ -519,22 +516,17 @@ static int jz4740_gpio_chip_init(struct jz_gpio_chip *chip, unsigned int id)
>  		irq_set_chip_and_handler(irq, &jz_gpio_irq_chip,
>  					 handle_level_irq);
>  	}
> -
> -	return 0;
>  }
>  
>  static int __init jz4740_gpio_init(void)
>  {
>  	unsigned int i;
> -	int ret;
> -
> -	ret = sysdev_class_register(&jz4740_gpio_sysdev_class);
> -	if (ret)
> -		return ret;
>  
>  	for (i = 0; i < ARRAY_SIZE(jz4740_gpio_chips); ++i)
>  		jz4740_gpio_chip_init(&jz4740_gpio_chips[i], i);
>  
> +	register_syscore_ops(&jz4740_gpio_syscore_ops);
> +
>  	printk(KERN_INFO "JZ4740 GPIO initialized\n");
>  
>  	return 0;
> -- 
> 1.7.2.5
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