[PATCH v5 1/4] clocksource: stm32: convert driver to timer_of
From: Julien Thierry <hidden>
Date: 2017-10-18 08:10:31
Also in:
linux-devicetree, lkml
Hi Benjamin, On 18/10/17 08:43, Benjamin Gaignard wrote:
quoted hunk ↗ jump to hunk
Convert driver to use timer_of helpers. This allow to remove custom proprietary structure. Increase min delta value because if it is too small it could generate too much interrupts and the system will not be able to catch them all. Signed-off-by: Benjamin Gaignard <redacted> --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/timer-stm32.c | 162 +++++++++++++------------------------- 2 files changed, 57 insertions(+), 106 deletions(-)diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index cc60620..755c0cc 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig@@ -289,6 +289,7 @@ config CLKSRC_STM32 bool "Clocksource for STM32 SoCs" if !ARCH_STM32 depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST) select CLKSRC_MMIO + select TIMER_OF config CLKSRC_MPS2 bool "Clocksource for MPS2 SoCs" if COMPILE_TESTdiff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c index 8f24237..abff21c 100644 --- a/drivers/clocksource/timer-stm32.c +++ b/drivers/clocksource/timer-stm32.c
[...]
-
-static int __init stm32_clockevent_init(struct device_node *np)
+static int __init stm32_clockevent_init(struct device_node *node)
{
- struct stm32_clock_event_ddata *data = &clock_event_ddata;
- struct clk *clk;
struct reset_control *rstc;
- unsigned long rate, max_delta;
- int irq, ret, bits, prescaler = 1;
-
- clk = of_clk_get(np, 0);
- if (IS_ERR(clk)) {
- ret = PTR_ERR(clk);
- pr_err("failed to get clock for clockevent (%d)\n", ret);
- goto err_clk_get;
- }
-
- ret = clk_prepare_enable(clk);
- if (ret) {
- pr_err("failed to enable timer clock for clockevent (%d)\n",
- ret);
- goto err_clk_enable;
- }
-
- rate = clk_get_rate(clk);
-
- rstc = of_reset_control_get(np, NULL);
+ unsigned long max_delta;
+ int ret, bits, prescaler = 1;
+ struct timer_of *to;
+
+ to = kzalloc(sizeof(*to), GFP_KERNEL);
+ if (!to)
+ return -ENOMEM;
+
+ to->flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE;
+ to->clkevt.name = "stm32_clockevent";
+ to->clkevt.rating = 200;
+ to->clkevt.features = CLOCK_EVT_FEAT_PERIODIC;
+ to->clkevt.set_state_shutdown = stm32_clock_event_shutdown;
+ to->clkevt.set_state_periodic = stm32_clock_event_set_periodic;
+ to->clkevt.set_state_oneshot = stm32_clock_event_shutdown;
+ to->clkevt.tick_resume = stm32_clock_event_shutdown;
+ to->clkevt.set_next_event = stm32_clock_event_set_next_event;
+
+ to->of_irq.handler = stm32_clock_event_handler;
+
+ ret = timer_of_init(node, to);
+ if (ret)
+ return ret;I don't know if we should keep some "err_*" labels at the end of the function, but here there probably should a "kfree(to)" before returning. Otherwise the patch looks fine to me. Cheers, -- Julien Thierry