MIPS: GCW0: Reduce system timer and clocksource to 750 kHz

The default clock (12 MHz) is too fast for the system timer.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Cc: od@zcrc.me

diff --git a/arch/mips/boot/dts/ingenic/gcw0.dts b/arch/mips/boot/dts/ingenic/gcw0.dts
index 35f0291e8d38165252d73d462a75ca10dd78c1fd..f58d239c20586cba391327d0d5a3a77629a8e438 100644 (file)
--- a/arch/mips/boot/dts/ingenic/gcw0.dts
+++ b/arch/mips/boot/dts/ingenic/gcw0.dts
@@ -2,6 +2,7 @@
 /dts-v1/;
 
 #include "jz4770.dtsi"
+#include <dt-bindings/clock/ingenic,tcu.h>
 
 / {
        compatible = "gcw,zero", "ingenic,jz4770";
@@ -60,3 +61,12 @@
        /* The WiFi module is connected to the UHC. */
        status = "okay";
 };
+
+&tcu {
+       /* 750 kHz for the system timer and clocksource */
+       assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER2>;
+       assigned-clock-rates = <750000>, <750000>;
+
+       /* PWM1 is in use, so reserve channel #2 for the clocksource */
+       ingenic,pwm-channels-mask = <0xfa>;
+};