diff mbox

[1/9] clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and rk_clock_event_device

Message ID 1479922177-20136-1-git-send-email-al.kochet@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alexander Kochetkov Nov. 23, 2016, 5:29 p.m. UTC
Move ce field out of struct bc_timer into struct rk_clock_event_device,
rename struct bc_timer to struct rk_timer.

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
---
 drivers/clocksource/rockchip_timer.c |   33 ++++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

Comments

Heiko Stübner Nov. 24, 2016, 12:01 p.m. UTC | #1
Hi Alexander,

I haven't looked to deep into your patches yet, but what is missing is the 
general goal of your whole series.

git format-patch has this nice "--cover-letter" option that creates obviously 
a cover-letter where you can describe what your series wants to achieve.

For those reading along, I guess what you want to achieve should be what I 
describe below, so of course no need to resend just for this :-)

-----
The clock supplying the arm-global-timer on the rk3188 is coming from the
the cpu clock itself and thus changes its rate everytime cpufreq adjusts the 
cpu frequency making this timer unsuitable as a stable clocksource.

The rk3188, rk3288 and following socs share a separate timer block already 
handled by the rockchip-timer driver. Therefore adapt this driver to also be 
able to act as clocksource on rk3188.
-----

Right?


Heiko


Am Mittwoch, 23. November 2016, 20:29:29 schrieb Alexander Kochetkov:
> Move ce field out of struct bc_timer into struct rk_clock_event_device,
> rename struct bc_timer to struct rk_timer.
>
> Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Alexander Kochetkov Nov. 24, 2016, 12:12 p.m. UTC | #2
Hello Heiko,

> I haven't looked to deep into your patches yet, but what is missing is the 
> general goal of your whole series.


I will be very grateful to receive feedback

> 24 нояб. 2016 г., в 15:01, Heiko Stübner <heiko@sntech.de> написал(а):
> 
> git format-patch has this nice "--cover-letter" option that creates obviously 
> a cover-letter where you can describe what your series wants to achieve.
> 
I’ve used --cover-letter option but forget to add message text. Just subject.
So all patches was sent without cover letter. I’ll be careful next time.

> For those reading along, I guess what you want to achieve should be what I 
> describe below, so of course no need to resend just for this :-)
> 
> -----
> The clock supplying the arm-global-timer on the rk3188 is coming from the
> the cpu clock itself and thus changes its rate everytime cpufreq adjusts the 
> cpu frequency making this timer unsuitable as a stable clocksource.
> 
> The rk3188, rk3288 and following socs share a separate timer block already 
> handled by the rockchip-timer driver. Therefore adapt this driver to also be 
> able to act as clocksource on rk3188.
> -----
> 
> Right?

Yes, exactly as you wrote.

Regards,
Alexander.
diff mbox

Patch

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index 23e267a..6d68d4c 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -29,18 +29,28 @@ 
 #define TIMER_MODE_USER_DEFINED_COUNT		(1 << 1)
 #define TIMER_INT_UNMASK			(1 << 2)
 
-struct bc_timer {
-	struct clock_event_device ce;
+struct rk_timer {
 	void __iomem *base;
 	void __iomem *ctrl;
 	u32 freq;
 };
 
-static struct bc_timer bc_timer;
+struct rk_clock_event_device {
+	struct clock_event_device ce;
+	struct rk_timer timer;
+};
+
+static struct rk_clock_event_device bc_timer;
+
+static inline struct rk_clock_event_device*
+rk_clock_event_device(struct clock_event_device *ce)
+{
+	return container_of(ce, struct rk_clock_event_device, ce);
+}
 
-static inline struct bc_timer *rk_timer(struct clock_event_device *ce)
+static inline struct rk_timer *rk_timer(struct clock_event_device *ce)
 {
-	return container_of(ce, struct bc_timer, ce);
+	return &rk_clock_event_device(ce)->timer;
 }
 
 static inline void __iomem *rk_base(struct clock_event_device *ce)
@@ -116,16 +126,17 @@  static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
 static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
 {
 	struct clock_event_device *ce = &bc_timer.ce;
+	struct rk_timer *timer = &bc_timer.timer;
 	struct clk *timer_clk;
 	struct clk *pclk;
 	int ret = -EINVAL, irq;
 
-	bc_timer.base = of_iomap(np, 0);
-	if (!bc_timer.base) {
+	timer->base = of_iomap(np, 0);
+	if (!timer->base) {
 		pr_err("Failed to get base address for '%s'\n", TIMER_NAME);
 		return -ENXIO;
 	}
-	bc_timer.ctrl = bc_timer.base + ctrl_reg;
+	timer->ctrl = timer->base + ctrl_reg;
 
 	pclk = of_clk_get_by_name(np, "pclk");
 	if (IS_ERR(pclk)) {
@@ -153,7 +164,7 @@  static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
 		goto out_timer_clk;
 	}
 
-	bc_timer.freq = clk_get_rate(timer_clk);
+	timer->freq = clk_get_rate(timer_clk);
 
 	irq = irq_of_parse_and_map(np, 0);
 	if (!irq) {
@@ -181,7 +192,7 @@  static int __init rk_timer_init(struct device_node *np, u32 ctrl_reg)
 		goto out_irq;
 	}
 
-	clockevents_config_and_register(ce, bc_timer.freq, 1, UINT_MAX);
+	clockevents_config_and_register(ce, timer->freq, 1, UINT_MAX);
 
 	return 0;
 
@@ -190,7 +201,7 @@  out_irq:
 out_timer_clk:
 	clk_disable_unprepare(pclk);
 out_unmap:
-	iounmap(bc_timer.base);
+	iounmap(timer->base);
 
 	return ret;
 }