linux-kernel - [PATCH 2/2] clocksource: mediatek: add clk13m and bus clock support

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Message-Id: <20201017153857.2494845-2-fparent@baylibre.com>
Date:   Sat, 17 Oct 2020 17:38:57 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     matthias.bgg@...il.com, robh+dt@...nel.org, tglx@...utronix.de,
        daniel.lezcano@...aro.org, Fabien Parent <fparent@...libre.com>
Subject: [PATCH 2/2] clocksource: mediatek: add clk13m and bus clock support

Some MediaTek SoC like MT8516 need to enable additional clocks
for the GPT timer. Enable them if present.

Signed-off-by: Fabien Parent <fparent@...libre.com>
---
 drivers/clocksource/timer-mediatek.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index 9318edcd8963..42e2d2090484 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c
@@ -9,6 +9,7 @@
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
 
+#include <linux/clk.h>
 #include <linux/clockchips.h>
 #include <linux/clocksource.h>
 #include <linux/interrupt.h>
@@ -278,8 +279,19 @@ static int __init mtk_syst_init(struct device_node *node)
 
 static int __init mtk_gpt_init(struct device_node *node)
 {
+	struct clk *clk_13m, *clk_bus;
 	int ret;
 
+	/* Optional clock*/
+	clk_13m = of_clk_get_by_name(node, "clk13m");
+	if (!IS_ERR(clk_13m))
+		clk_prepare_enable(clk_13m);
+
+	/* Optional clock*/
+	clk_bus = of_clk_get_by_name(node, "bus");
+	if (!IS_ERR(clk_bus))
+		clk_prepare_enable(clk_bus);
+
 	to.clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
 	to.clkevt.set_state_shutdown = mtk_gpt_clkevt_shutdown;
 	to.clkevt.set_state_periodic = mtk_gpt_clkevt_set_periodic;
-- 
2.28.0