linux-kernel - [PATCH] rtc: brcmstb-waketimer: Set wktmr prescaler

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Message-Id: <1519262155-15580-1-git-send-email-justin.chen@broadcom.com>
Date:   Wed, 21 Feb 2018 17:15:55 -0800
From:   Justin Chen <justin.chen@...adcom.com>
To:     linux-rtc@...r.kernel.org
Cc:     a.zummo@...ertech.it, alexandre.belloni@...e-electrons.com,
        computersforpeace@...il.com, gregory.0xf0@...il.com,
        f.fainelli@...il.com, bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Justin Chen <justin.chen@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>
Subject: [PATCH] rtc: brcmstb-waketimer: Set wktmr prescaler

The HW default is one tick per second, however instead of assuming this,
lets make sure the waketimer is actually one tick per second before
arming the alarm.

Signed-off-by: Justin Chen <justinpopo6@...il.com>
---
 drivers/rtc/rtc-brcmstb-waketimer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-brcmstb-waketimer.c b/drivers/rtc/rtc-brcmstb-waketimer.c
index 796ac79..46116b7 100644
--- a/drivers/rtc/rtc-brcmstb-waketimer.c
+++ b/drivers/rtc/rtc-brcmstb-waketimer.c
@@ -60,6 +60,10 @@ static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
 {
 	brcmstb_waketmr_clear_alarm(timer);
 
+	/* Make sure we are actually counting in seconds */
+	writel_relaxed(BRCMSTB_WKTMR_DEFAULT_FREQ,
+			timer->base + BRCMSTB_WKTMR_PRESCALER);
+
 	writel_relaxed(secs + 1, timer->base + BRCMSTB_WKTMR_ALARM);
 }
 
-- 
2.7.4