[tip:timers/core] clocksource/drivers/dw_apb: Add reset control

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Commit-ID:  0e33ed9fccc919aafa5746b706a5067029bb83f4
Gitweb:     https://git.kernel.org/tip/0e33ed9fccc919aafa5746b706a5067029bb83f4
Author:     Dinh Nguyen <dinguyen@xxxxxxxxxx>
AuthorDate: Mon, 17 Sep 2018 09:52:14 -0500
Committer:  Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Wed, 3 Oct 2018 14:37:03 +0200

clocksource/drivers/dw_apb: Add reset control

Add code to retrieve the reset property from the dw-apb timers and if
the property is available, the safe operation is to assert the timer
into reset, and followed by a deassert of the timer reset (brings the
timer out of reset).

This patch is needed for systems where the bootloader has left the timer
not used in reset.

 - Trivial conflict with commit a74bd1ad7a:
    "Convert to using %pOFn instead of device_node.name"

Signed-off-by: Marek Vasut <marex@xxxxxxx>
Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
 drivers/clocksource/dw_apb_timer_of.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/clocksource/dw_apb_timer_of.c b/drivers/clocksource/dw_apb_timer_of.c
index fabaa29cc3a4..db410acd8964 100644
--- a/drivers/clocksource/dw_apb_timer_of.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -22,6 +22,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/clk.h>
+#include <linux/reset.h>
 #include <linux/sched_clock.h>
 
 static void __init timer_get_base_and_rate(struct device_node *np,
@@ -29,12 +30,23 @@ static void __init timer_get_base_and_rate(struct device_node *np,
 {
 	struct clk *timer_clk;
 	struct clk *pclk;
+	struct reset_control *rstc;
 
 	*base = of_iomap(np, 0);
 
 	if (!*base)
 		panic("Unable to map regs for %pOFn", np);
 
+	/*
+	 * Reset the timer if the reset control is available, wiping
+	 * out the state the firmware may have left it
+	 */
+	rstc = of_reset_control_get(np, NULL);
+	if (!IS_ERR(rstc)) {
+		reset_control_assert(rstc);
+		reset_control_deassert(rstc);
+	}
+
 	/*
 	 * Not all implementations use a periphal clock, so don't panic
 	 * if it's not present



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