[PATCH 31/33] ARM: dts: exynos: Correct S3C RTC bindings in SMDK4412

[Krzysztof Kozlowski]

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 and silence dtbs_check
warnings like:

  arch/arm/boot/dts/exynos4412-smdk4412.dt.yaml: rtc@10070000: clocks: [[7, 
346]] is too short
  arch/arm/boot/dts/exynos4412-smdk4412.dt.yaml: rtc@10070000: clock-names: 
['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <k...@kernel.org>
---
 arch/arm/boot/dts/exynos4412-smdk4412.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412-smdk4412.dts 
b/arch/arm/boot/dts/exynos4412-smdk4412.dts
index 3667fa048e0f..49971203a8aa 100644
--- a/arch/arm/boot/dts/exynos4412-smdk4412.dts
+++ b/arch/arm/boot/dts/exynos4412-smdk4412.dts
@@ -37,6 +37,13 @@
                        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>;
+               };
        };
 };
 
@@ -142,6 +149,11 @@
        };
 };
 
+&rtc {
+       clocks = <&clock CLK_RTC>, <&pmic_ap_clk>;
+       clock-names = "rtc", "rtc_src";
+};
+
 &sdhci_2 {
        bus-width = <4>;
        pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_bus4 &sd2_cd>;
-- 
2.17.1