Date:	Fri, 6 Nov 2015 12:37:36 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] h8300: cleanup startup and remove module code.

On 11/06/2015 08:03 AM, Yoshinori Sato wrote:
> h8300's clocksource driver update.
> Changes for v1
> - Drop non-initialize changes.
> - Private data static allocation.
> - Avoid magic number.
> - Use request_irq.

Hi Yoshinori,

thanks for the changes.

Unfortunately, they don't apply.

You should base your changes on top of:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tip/timers/core

In order to have the latest changes with the h8300. One of them in the 
removal of the memset.

Regards

   -- Daniel

> Signed-off-by: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> ---
>   drivers/clocksource/h8300_timer16.c | 142 +++++++++++++--------------------
>   drivers/clocksource/h8300_timer8.c  | 151 ++++++++++++------------------------
>   drivers/clocksource/h8300_tpu.c     | 118 ++++++++++------------------
>   3 files changed, 144 insertions(+), 267 deletions(-)
>
> diff --git a/drivers/clocksource/h8300_timer16.c b/drivers/clocksource/h8300_timer16.c
> index 82941c1..cdf0d83 100644
> --- a/drivers/clocksource/h8300_timer16.c
> +++ b/drivers/clocksource/h8300_timer16.c
> @@ -17,6 +17,8 @@
>   #include <linux/clk.h>
>   #include <linux/io.h>
>   #include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
>
>   #include <asm/segment.h>
>   #include <asm/irq.h>
> @@ -47,9 +49,7 @@
>   #define ABSOLUTE 1
>
>   struct timer16_priv {
> -	struct platform_device *pdev;
>   	struct clocksource cs;
> -	struct irqaction irqaction;
>   	unsigned long total_cycles;
>   	unsigned long mapbase;
>   	unsigned long mapcommon;
> @@ -144,111 +144,77 @@ static void timer16_disable(struct clocksource *cs)
>   	p->cs_enabled = false;
>   }
>
> +static struct timer16_priv timer16_priv = {
> +	.cs = {
> +		.name = "h8300_16timer",
> +		.rating = 200,
> +		.read = timer16_clocksource_read,
> +		.enable = timer16_enable,
> +		.disable = timer16_disable,
> +		.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8),
> +		.flags = CLOCK_SOURCE_IS_CONTINUOUS,
> +	},
> +};
> +
>   #define REG_CH   0
>   #define REG_COMM 1
>
> -static int timer16_setup(struct timer16_priv *p, struct platform_device *pdev)
> +static void __init h8300_16timer_init(struct device_node *node)
>   {
> -	struct resource *res[2];
> +	void __iomem *base[2];
>   	int ret, irq;
>   	unsigned int ch;
> +	struct clk *clk;
>
> -	memset(p, 0, sizeof(*p));
> -	p->pdev = pdev;
> -
> -	res[REG_CH] = platform_get_resource(p->pdev,
> -					    IORESOURCE_MEM, REG_CH);
> -	res[REG_COMM] = platform_get_resource(p->pdev,
> -					      IORESOURCE_MEM, REG_COMM);
> -	if (!res[REG_CH] || !res[REG_COMM]) {
> -		dev_err(&p->pdev->dev, "failed to get I/O memory\n");
> -		return -ENXIO;
> -	}
> -	irq = platform_get_irq(p->pdev, 0);
> -	if (irq < 0) {
> -		dev_err(&p->pdev->dev, "failed to get irq\n");
> -		return irq;
> +	clk = of_clk_get(node, 0);
> +	if (IS_ERR(clk)) {
> +		pr_err("failed to get clock for clocksource\n");
> +		return;
>   	}
>
> -	p->clk = clk_get(&p->pdev->dev, "fck");
> -	if (IS_ERR(p->clk)) {
> -		dev_err(&p->pdev->dev, "can't get clk\n");
> -		return PTR_ERR(p->clk);
> +	base[REG_CH] = of_iomap(node, 0);
> +	if (!base[REG_CH]) {
> +		pr_err("failed to map registers for clocksource\n");
> +		goto free_clk;
>   	}
> -	of_property_read_u32(p->pdev->dev.of_node, "renesas,channel", &ch);
> -
> -	p->pdev = pdev;
> -	p->mapbase = res[REG_CH]->start;
> -	p->mapcommon = res[REG_COMM]->start;
> -	p->enb = 1 << ch;
> -	p->imfa = 1 << ch;
> -	p->imiea = 1 << (4 + ch);
> -	p->cs.name = pdev->name;
> -	p->cs.rating = 200;
> -	p->cs.read = timer16_clocksource_read;
> -	p->cs.enable = timer16_enable;
> -	p->cs.disable = timer16_disable;
> -	p->cs.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
> -	p->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
>
> -	ret = request_irq(irq, timer16_interrupt,
> -			  IRQF_TIMER, pdev->name, p);
> -	if (ret < 0) {
> -		dev_err(&p->pdev->dev, "failed to request irq %d\n", irq);
> -		return ret;
> +	base[REG_COMM] = of_iomap(node, 1);
> +	if (!base[REG_COMM]) {
> +		pr_err("failed to map registers for clocksource\n");
> +		goto unmap_ch;
>   	}
>
> -	clocksource_register_hz(&p->cs, clk_get_rate(p->clk) / 8);
> -
> -	return 0;
> -}
> -
> -static int timer16_probe(struct platform_device *pdev)
> -{
> -	struct timer16_priv *p = platform_get_drvdata(pdev);
> -
> -	if (p) {
> -		dev_info(&pdev->dev, "kept as earlytimer\n");
> -		return 0;
> +	irq = irq_of_parse_and_map(node, 0);
> +	if (irq < 0) {
> +		pr_err("failed to get irq for clockevent\n");
> +		goto unmap_comm;
>   	}
>
> -	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
> -	if (!p)
> -		return -ENOMEM;
> +	of_property_read_u32(node, "renesas,channel", &ch);
>
> -	return timer16_setup(p, pdev);
> -}
> +	timer16_priv.mapbase = (unsigned long)base[REG_CH];
> +	timer16_priv.mapcommon = (unsigned long)base[REG_COMM];
> +	timer16_priv.enb = 1 << ch;
> +	timer16_priv.imfa = 1 << ch;
> +	timer16_priv.imiea = 1 << (4 + ch);
>
> -static int timer16_remove(struct platform_device *pdev)
> -{
> -	return -EBUSY;
> -}
> -
> -static const struct of_device_id timer16_of_table[] = {
> -	{ .compatible = "renesas,16bit-timer" },
> -	{ }
> -};
> -static struct platform_driver timer16_driver = {
> -	.probe		= timer16_probe,
> -	.remove		= timer16_remove,
> -	.driver		= {
> -		.name	= "h8300h-16timer",
> -		.of_match_table = of_match_ptr(timer16_of_table),
> +	ret = request_irq(irq, timer16_interrupt,
> +			  IRQF_TIMER, timer16_priv.cs.name, &timer16_priv);
> +	if (ret < 0) {
> +		pr_err("failed to request irq %d of clocksource\n", irq);
> +		goto unmap_comm;
>   	}
> -};
>
> -static int __init timer16_init(void)
> -{
> -	return platform_driver_register(&timer16_driver);
> -}
> +	clocksource_register_hz(&timer16_priv.cs,
> +				clk_get_rate(timer16_priv.clk) / 8);
> +	return;
>
> -static void __exit timer16_exit(void)
> -{
> -	platform_driver_unregister(&timer16_driver);
> +unmap_comm:
> +	iounmap(base[REG_COMM]);
> +unmap_ch:
> +	iounmap(base[REG_CH]);
> +free_clk:
> +	clk_put(clk);
>   }
>
> -subsys_initcall(timer16_init);
> -module_exit(timer16_exit);
> -MODULE_AUTHOR("Yoshinori Sato");
> -MODULE_DESCRIPTION("H8/300H 16bit Timer Driver");
> -MODULE_LICENSE("GPL v2");
> +CLOCKSOURCE_OF_DECLARE(h8300_16bit, "renesas,16bit-timer", h8300_16timer_init);
> diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
> index e83db7b..5bb4e09 100644
> --- a/drivers/clocksource/h8300_timer8.c
> +++ b/drivers/clocksource/h8300_timer8.c
> @@ -12,13 +12,14 @@
>   #include <linux/kernel.h>
>   #include <linux/interrupt.h>
>   #include <linux/init.h>
> -#include <linux/platform_device.h>
>   #include <linux/slab.h>
>   #include <linux/clockchips.h>
>   #include <linux/module.h>
>   #include <linux/clk.h>
>   #include <linux/io.h>
>   #include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
>
>   #include <asm/irq.h>
>
> @@ -39,10 +40,10 @@
>   #define RELATIVE 0
>   #define ABSOLUTE 1
>
> +#define SCALE 64
> +
>   struct timer8_priv {
> -	struct platform_device *pdev;
>   	struct clock_event_device ced;
> -	struct irqaction irqaction;
>   	unsigned long mapbase;
>   	raw_spinlock_t lock;
>   	unsigned long flags;
> @@ -112,7 +113,7 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
>
>   static int timer8_enable(struct timer8_priv *p)
>   {
> -	p->rate = clk_get_rate(p->pclk) / 64;
> +	p->rate = clk_get_rate(p->pclk) / SCALE;
>   	ctrl_outw(0xffff, p->mapbase + TCORA);
>   	ctrl_outw(0x0000, p->mapbase + _8TCNT);
>   	ctrl_outw(0x0c02, p->mapbase + _8TCR);
> @@ -180,7 +181,7 @@ static int timer8_clock_event_periodic(struct clock_event_device *ced)
>   {
>   	struct timer8_priv *p = ced_to_priv(ced);
>
> -	dev_info(&p->pdev->dev, "used for periodic clock events\n");
> +	pr_info("%s: used for periodic clock events\n", ced->name);
>   	timer8_stop(p);
>   	timer8_clock_event_start(p, PERIODIC);
>
> @@ -191,7 +192,7 @@ static int timer8_clock_event_oneshot(struct clock_event_device *ced)
>   {
>   	struct timer8_priv *p = ced_to_priv(ced);
>
> -	dev_info(&p->pdev->dev, "used for oneshot clock events\n");
> +	pr_info("%s: used for oneshot clock events\n", ced->name);
>   	timer8_stop(p);
>   	timer8_clock_event_start(p, ONESHOT);
>
> @@ -209,111 +210,61 @@ static int timer8_clock_event_next(unsigned long delta,
>   	return 0;
>   }
>
> -static int timer8_setup(struct timer8_priv *p,
> -			struct platform_device *pdev)
> +static struct timer8_priv timer8_priv = {
> +	.ced = {
> +		.name = "h8300_8timer",
> +		.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
> +		.rating = 200,
> +		.set_next_event = timer8_clock_event_next,
> +		.set_state_shutdown = timer8_clock_event_shutdown,
> +		.set_state_periodic = timer8_clock_event_periodic,
> +		.set_state_oneshot = timer8_clock_event_oneshot,
> +	},
> +};
> +
> +static void __init h8300_8timer_init(struct device_node *node)
>   {
> -	struct resource *res;
> +	void __iomem *base;
>   	int irq;
> -	int ret;
> +	int ret = 0;
> +	int rate;
> +	struct clk *clk;
>
> -	memset(p, 0, sizeof(*p));
> -	p->pdev = pdev;
> +	clk = of_clk_get(node, 0);
> +	if (IS_ERR(clk)) {
> +		pr_err("failed to get clock for clockevent\n");
> +		return;
> +	}
>
> -	res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
> -	if (!res) {
> -		dev_err(&p->pdev->dev, "failed to get I/O memory\n");
> -		return -ENXIO;
> +	base = of_iomap(node, 0);
> +	if (!base) {
> +		pr_err("failed to map registers for clockevent\n");
> +		goto free_clk;
>   	}
>
> -	irq = platform_get_irq(p->pdev, 0);
> +	irq = irq_of_parse_and_map(node, 0);
>   	if (irq < 0) {
> -		dev_err(&p->pdev->dev, "failed to get irq\n");
> -		return -ENXIO;
> +		pr_err("failed to get irq for clockevent\n");
> +		goto unmap_reg;
>   	}
>
> -	p->mapbase = res->start;
> -
> -	p->irqaction.name = dev_name(&p->pdev->dev);
> -	p->irqaction.handler = timer8_interrupt;
> -	p->irqaction.dev_id = p;
> -	p->irqaction.flags = IRQF_TIMER;
> -
> -	p->pclk = clk_get(&p->pdev->dev, "fck");
> -	if (IS_ERR(p->pclk)) {
> -		dev_err(&p->pdev->dev, "can't get clk\n");
> -		return PTR_ERR(p->pclk);
> -	}
> +	timer8_priv.mapbase = (unsigned long)base;
> +	timer8_priv.pclk = clk;
>
> -	p->ced.name = pdev->name;
> -	p->ced.features = CLOCK_EVT_FEAT_PERIODIC |
> -		CLOCK_EVT_FEAT_ONESHOT;
> -	p->ced.rating = 200;
> -	p->ced.cpumask = cpumask_of(0);
> -	p->ced.set_next_event = timer8_clock_event_next;
> -	p->ced.set_state_shutdown = timer8_clock_event_shutdown;
> -	p->ced.set_state_periodic = timer8_clock_event_periodic;
> -	p->ced.set_state_oneshot = timer8_clock_event_oneshot;
> -
> -	ret = setup_irq(irq, &p->irqaction);
> +	ret = request_irq(irq, timer8_interrupt,
> +			  IRQF_TIMER, timer8_priv.ced.name, &timer8_priv);
>   	if (ret < 0) {
> -		dev_err(&p->pdev->dev,
> -			"failed to request irq %d\n", irq);
> -		return ret;
> +		pr_err("failed to request irq %d for clockevent\n", irq);
> +		goto unmap_reg;
>   	}
> -	clockevents_register_device(&p->ced);
> -	platform_set_drvdata(pdev, p);
> -
> -	return 0;
> -}
> -
> -static int timer8_probe(struct platform_device *pdev)
> -{
> -	struct timer8_priv *p = platform_get_drvdata(pdev);
> -
> -	if (p) {
> -		dev_info(&pdev->dev, "kept as earlytimer\n");
> -		return 0;
> -	}
> -
> -	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
> -	if (!p)
> -		return -ENOMEM;
> -
> -	return timer8_setup(p, pdev);
> -}
> -
> -static int timer8_remove(struct platform_device *pdev)
> -{
> -	return -EBUSY;
> -}
> -
> -static const struct of_device_id timer8_of_table[] __maybe_unused = {
> -	{ .compatible = "renesas,8bit-timer" },
> -	{ }
> -};
> -
> -MODULE_DEVICE_TABLE(of, timer8_of_table);
> -static struct platform_driver timer8_driver = {
> -	.probe		= timer8_probe,
> -	.remove		= timer8_remove,
> -	.driver		= {
> -		.name	= "h8300-8timer",
> -		.of_match_table = of_match_ptr(timer8_of_table),
> -	}
> -};
> -
> -static int __init timer8_init(void)
> -{
> -	return platform_driver_register(&timer8_driver);
> -}
> -
> -static void __exit timer8_exit(void)
> -{
> -	platform_driver_unregister(&timer8_driver);
> +	rate = clk_get_rate(clk) / SCALE;
> +	clockevents_config_and_register(&timer8_priv.ced, rate, 1, 0x0000ffff);
> +	return;
> +
> +unmap_reg:
> +	iounmap(base);
> +free_clk:
> +	clk_put(clk);
>   }
>
> -subsys_initcall(timer8_init);
> -module_exit(timer8_exit);
> -MODULE_AUTHOR("Yoshinori Sato");
> -MODULE_DESCRIPTION("H8/300 8bit Timer Driver");
> -MODULE_LICENSE("GPL v2");
> +CLOCKSOURCE_OF_DECLARE(h8300_8bit, "renesas,8bit-timer", h8300_8timer_init);
> diff --git a/drivers/clocksource/h8300_tpu.c b/drivers/clocksource/h8300_tpu.c
> index 64195fd..ed0b493 100644
> --- a/drivers/clocksource/h8300_tpu.c
> +++ b/drivers/clocksource/h8300_tpu.c
> @@ -1,5 +1,5 @@
>   /*
> - *  H8/300 TPU Driver
> + *  H8S TPU Driver
>    *
>    *  Copyright 2015 Yoshinori Sato <ysato@...rs.sourcefoge.jp>
>    *
> @@ -17,8 +17,8 @@
>   #include <linux/clk.h>
>   #include <linux/io.h>
>   #include <linux/of.h>
> -
> -#include <asm/irq.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
>
>   #define TCR	0
>   #define TMDR	1
> @@ -32,9 +32,7 @@
>   #define TGRD	14
>
>   struct tpu_priv {
> -	struct platform_device *pdev;
>   	struct clocksource cs;
> -	struct clk *clk;
>   	unsigned long mapbase1;
>   	unsigned long mapbase2;
>   	raw_spinlock_t lock;
> @@ -116,92 +114,54 @@ static void tpu_clocksource_disable(struct clocksource *cs)
>   	p->cs_enabled = false;
>   }
>
> +static struct tpu_priv tpu_priv = {
> +	.cs = {
> +		.name = "H8S_TPU",
> +		.rating = 200,
> +		.read = tpu_clocksource_read,
> +		.enable = tpu_clocksource_enable,
> +		.disable = tpu_clocksource_disable,
> +		.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8),
> +		.flags = CLOCK_SOURCE_IS_CONTINUOUS,
> +	},
> +};
> +
>   #define CH_L 0
>   #define CH_H 1
>
> -static int __init tpu_setup(struct tpu_priv *p, struct platform_device *pdev)
> +static void __init h8300_tpu_init(struct device_node *node)
>   {
> -	struct resource *res[2];
> -
> -	memset(p, 0, sizeof(*p));
> -	p->pdev = pdev;
> +	void __iomem *base[2];
> +	struct clk *clk;
>
> -	res[CH_L] = platform_get_resource(p->pdev, IORESOURCE_MEM, CH_L);
> -	res[CH_H] = platform_get_resource(p->pdev, IORESOURCE_MEM, CH_H);
> -	if (!res[CH_L] || !res[CH_H]) {
> -		dev_err(&p->pdev->dev, "failed to get I/O memory\n");
> -		return -ENXIO;
> +	clk = of_clk_get(node, 0);
> +	if (IS_ERR(clk)) {
> +		pr_err("failed to get clock for clocksource\n");
> +		return;
>   	}
>
> -	p->clk = clk_get(&p->pdev->dev, "fck");
> -	if (IS_ERR(p->clk)) {
> -		dev_err(&p->pdev->dev, "can't get clk\n");
> -		return PTR_ERR(p->clk);
> +	base[CH_L] = of_iomap(node, CH_L);
> +	if (!base[CH_L]) {
> +		pr_err("failed to map registers for clocksource\n");
> +		goto free_clk;
>   	}
> -
> -	p->mapbase1 = res[CH_L]->start;
> -	p->mapbase2 = res[CH_H]->start;
> -
> -	p->cs.name = pdev->name;
> -	p->cs.rating = 200;
> -	p->cs.read = tpu_clocksource_read;
> -	p->cs.enable = tpu_clocksource_enable;
> -	p->cs.disable = tpu_clocksource_disable;
> -	p->cs.mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
> -	p->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
> -	clocksource_register_hz(&p->cs, clk_get_rate(p->clk) / 64);
> -	platform_set_drvdata(pdev, p);
> -
> -	return 0;
> -}
> -
> -static int tpu_probe(struct platform_device *pdev)
> -{
> -	struct tpu_priv *p = platform_get_drvdata(pdev);
> -
> -	if (p) {
> -		dev_info(&pdev->dev, "kept as earlytimer\n");
> -		return 0;
> +	base[CH_H] = of_iomap(node, CH_H);
> +	if (!base[CH_H]) {
> +		pr_err("failed to map registers for clocksource\n");
> +		goto unmap_L;
>   	}
>
> -	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
> -	if (!p)
> -		return -ENOMEM;
> +	tpu_priv.mapbase1 = (unsigned long)base[CH_L];
> +	tpu_priv.mapbase2 = (unsigned long)base[CH_H];
>
> -	return tpu_setup(p, pdev);
> -}
> +	clocksource_register_hz(&tpu_priv.cs, clk_get_rate(clk) / 64);
>
> -static int tpu_remove(struct platform_device *pdev)
> -{
> -	return -EBUSY;
> -}
> +	return;
>
> -static const struct of_device_id tpu_of_table[] = {
> -	{ .compatible = "renesas,tpu" },
> -	{ }
> -};
> -
> -static struct platform_driver tpu_driver = {
> -	.probe		= tpu_probe,
> -	.remove		= tpu_remove,
> -	.driver		= {
> -		.name	= "h8s-tpu",
> -		.of_match_table = of_match_ptr(tpu_of_table),
> -	}
> -};
> -
> -static int __init tpu_init(void)
> -{
> -	return platform_driver_register(&tpu_driver);
> -}
> -
> -static void __exit tpu_exit(void)
> -{
> -	platform_driver_unregister(&tpu_driver);
> +unmap_L:
> +	iounmap(base[CH_H]);
> +free_clk:
> +	clk_put(clk);
>   }
>
> -subsys_initcall(tpu_init);
> -module_exit(tpu_exit);
> -MODULE_AUTHOR("Yoshinori Sato");
> -MODULE_DESCRIPTION("H8S Timer Pulse Unit Driver");
> -MODULE_LICENSE("GPL v2");
> +CLOCKSOURCE_OF_DECLARE(h8300_tpu, "renesas,tpu", h8300_tpu_init);
>


-- 
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