ARM: dts: am4372: fix clock source for arm twd and global timers

ARM TWD and Global timer are clocked by PERIPHCLK which is MPU_CLK/2.
But now they are clocked by dpll_mpu_m2_ck == MPU_CLK and, as result.
Timekeeping core misbehaves. For example, execution of command
"sleep 5" will take 10 sec instead of 5.

Hence, fix it by adding mpu_periphclk ("fixed-factor-clock") and use
it for clocking ARM TWD and Global timer (same way as on OMAP4).

Cc: Tony Lindgren <tony@atomide.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Tero Kristo <t-kristo@ti.com>
Fixes:commit 8cbd4c2f6a99 ("arm: boot: dts: am4372: add ARM timers and SCU nodes")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 10 insertions, 2 deletions

diff --git a/arch/arm/boot/dts/am4372.dtsi b/arch/arm/boot/dts/am4372.dtsi
index d83ff9c9701e..de8791a4d131 100644
--- a/arch/arm/boot/dts/am4372.dtsi
+++ b/arch/arm/boot/dts/am4372.dtsi
@@ -74,7 +74,7 @@
                 reg = <0x48240200 0x100>;
                 interrupts = <GIC_PPI 11 IRQ_TYPE_LEVEL_HIGH>;
                 interrupt-parent = <&gic>;
-                clocks = <&dpll_mpu_m2_ck>;
+                clocks = <&mpu_periphclk>;
         };
 
         local_timer: timer@48240600 {
@@ -82,7 +82,7 @@
                 reg = <0x48240600 0x100>;
                 interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_HIGH>;
                 interrupt-parent = <&gic>;
-                clocks = <&dpll_mpu_m2_ck>;
+                clocks = <&mpu_periphclk>;
         };
 
         l2-cache-controller@48242000 {
diff --git a/arch/arm/boot/dts/am43xx-clocks.dtsi b/arch/arm/boot/dts/am43xx-clocks.dtsi
index cc88728d751d..a38af2bfbfcf 100644
--- a/arch/arm/boot/dts/am43xx-clocks.dtsi
+++ b/arch/arm/boot/dts/am43xx-clocks.dtsi
@@ -259,6 +259,14 @@
                 ti,invert-autoidle-bit;
         };
 
+        mpu_periphclk: mpu_periphclk {
+                #clock-cells = <0>;
+                compatible = "fixed-factor-clock";
+                clocks = <&dpll_mpu_m2_ck>;
+                clock-mult = <1>;
+                clock-div = <2>;
+        };
+
         dpll_ddr_ck: dpll_ddr_ck {
                 #clock-cells = <0>;
                 compatible = "ti,am3-dpll-clock";