ARM: dts: exynos: Correct S3C RTC bindings in Tiny4412

The S3C RTC requires 32768 Hz clock as input which is provided by PMIC.
However the PMIC is not described in DTS at all so at least add a
workaround to model its clock with fixed-clock.  This fixes S3C RTC and
silences dtbs_check warnings like:

  arch/arm/boot/dts/exynos4412-tiny4412.dt.yaml: rtc@10070000: clocks: [[7, 346]] is too short
  arch/arm/boot/dts/exynos4412-tiny4412.dt.yaml: rtc@10070000: clock-names: ['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200830135200.24304-32-krzk@kernel.org

diff --git a/arch/arm/boot/dts/exynos4412-tiny4412.dts b/arch/arm/boot/dts/exynos4412-tiny4412.dts
index 7512c86e634e1a76fec2c6256f1cb8d4ea6d56fa..017b26108bb0c415ce6f629c4fca75e8999b6c87 100644 (file)
--- a/arch/arm/boot/dts/exynos4412-tiny4412.dts
+++ b/arch/arm/boot/dts/exynos4412-tiny4412.dts
@@ -65,6 +65,13 @@
                        compatible = "samsung,clock-xusbxti";
                        clock-frequency = <24000000>;
                };
+
+               pmic_ap_clk: pmic-ap-clk {
+                       /* Workaround for missing clock on PMIC */
+                       compatible = "fixed-clock";
+                       #clock-cells = <0>;
+                       clock-frequency = <32768>;
+               };
        };
 
        panel {
@@ -110,6 +117,8 @@
 
 &rtc {
        status = "okay";
+       clocks = <&clock CLK_RTC>, <&pmic_ap_clk>;
+       clock-names = "rtc", "rtc_src";
 };
 
 &sdhci_2 {