linux-kernel - [PATCH 09/16] clocksource/drivers/timer-atmel-tcb: Add sama5d2 support

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Message-Id: <20200723152639.639771-9-daniel.lezcano@linaro.org>
Date:   Thu, 23 Jul 2020 17:26:29 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     tglx@...utronix.de
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-kernel@...r.kernel.org (open list:CLOCKSOURCE, CLOCKEVENT DRIVERS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Microchip
        (AT91) SoC support)
Subject: [PATCH 09/16] clocksource/drivers/timer-atmel-tcb: Add sama5d2 support

From: Alexandre Belloni <alexandre.belloni@...tlin.com>

The first divisor for the sama5d2 is actually the gclk selector. Because
the currently remaining divisors are fitting the use case, currently ensure
it is skipped.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20200710230813.1005150-10-alexandre.belloni@bootlin.com
---
 drivers/clocksource/timer-atmel-tcb.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-atmel-tcb.c b/drivers/clocksource/timer-atmel-tcb.c
index 7fea134650fc..787dbebbb432 100644
--- a/drivers/clocksource/timer-atmel-tcb.c
+++ b/drivers/clocksource/timer-atmel-tcb.c
@@ -359,9 +359,15 @@ static struct atmel_tcb_config tcb_sam9x5_config = {
 	.counter_width = 32,
 };
 
+static struct atmel_tcb_config tcb_sama5d2_config = {
+	.counter_width = 32,
+	.has_gclk = 1,
+};
+
 static const struct of_device_id atmel_tcb_of_match[] = {
 	{ .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },
 	{ .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },
+	{ .compatible = "atmel,sama5d2-tcb", .data = &tcb_sama5d2_config, },
 	{ /* sentinel */ }
 };
 
@@ -426,7 +432,10 @@ static int __init tcb_clksrc_init(struct device_node *node)
 
 	/* How fast will we be counting?  Pick something over 5 MHz.  */
 	rate = (u32) clk_get_rate(t0_clk);
-	for (i = 0; i < ARRAY_SIZE(atmel_tcb_divisors); i++) {
+	i = 0;
+	if (tc.tcb_config->has_gclk)
+		i = 1;
+	for (; i < ARRAY_SIZE(atmel_tcb_divisors); i++) {
 		unsigned divisor = atmel_tcb_divisors[i];
 		unsigned tmp;
 
-- 
2.25.1