[tip: timers/core] clocksource/drivers/timer-atmel-tcb: Rework 32khz clock selection

["tip-bot2 for Alexandre Belloni" <tip-bot2@linutronix.de>]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     228e21848623e0ce54a1a3d7857b444813e49b2e
Gitweb:        https://git.kernel.org/tip/228e21848623e0ce54a1a3d7857b444813e49b2e
Author:        Alexandre Belloni <alexandre.belloni@bootlin.com>
AuthorDate:    Sat, 11 Jul 2020 01:08:09 +02:00
Committer:     Daniel Lezcano <daniel.lezcano@linaro.org>
CommitterDate: Sat, 11 Jul 2020 18:57:58 +02:00

clocksource/drivers/timer-atmel-tcb: Rework 32khz clock selection

On all the supported SoCs, the slow clock is always ATMEL_TC_TIMER_CLOCK5,
avoid looking it up and pass it directly to setup_clkevents.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200710230813.1005150-6-alexandre.belloni@bootlin.com
---
 drivers/clocksource/timer-atmel-tcb.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/clocksource/timer-atmel-tcb.c b/drivers/clocksource/timer-atmel-tcb.c
index 7427b07..b255a4a 100644
--- a/drivers/clocksource/timer-atmel-tcb.c
+++ b/drivers/clocksource/timer-atmel-tcb.c
@@ -346,7 +346,7 @@ static void __init tcb_setup_single_chan(struct atmel_tc *tc, int mck_divisor_id
 	writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
 }
 
-static const u8 atmel_tcb_divisors[5] = { 2, 8, 32, 128, 0, };
+static const u8 atmel_tcb_divisors[] = { 2, 8, 32, 128 };
 
 static const struct of_device_id atmel_tcb_of_match[] = {
 	{ .compatible = "atmel,at91rm9200-tcb", .data = (void *)16, },
@@ -362,7 +362,6 @@ static int __init tcb_clksrc_init(struct device_node *node)
 	u64 (*tc_sched_clock)(void);
 	u32 rate, divided_rate = 0;
 	int best_divisor_idx = -1;
-	int clk32k_divisor_idx = -1;
 	int bits;
 	int i;
 	int ret;
@@ -416,12 +415,6 @@ static int __init tcb_clksrc_init(struct device_node *node)
 		unsigned divisor = atmel_tcb_divisors[i];
 		unsigned tmp;
 
-		/* remember 32 KiHz clock for later */
-		if (!divisor) {
-			clk32k_divisor_idx = i;
-			continue;
-		}
-
 		tmp = rate / divisor;
 		pr_debug("TC: %u / %-3u [%d] --> %u\n", rate, divisor, i, tmp);
 		if (best_divisor_idx > 0) {
@@ -467,7 +460,7 @@ static int __init tcb_clksrc_init(struct device_node *node)
 		goto err_disable_t1;
 
 	/* channel 2:  periodic and oneshot timer support */
-	ret = setup_clkevents(&tc, clk32k_divisor_idx);
+	ret = setup_clkevents(&tc, ATMEL_TC_TIMER_CLOCK5);
 	if (ret)
 		goto err_unregister_clksrc;