ARM: dts: s5pv210: add RTC 32 KHz clock in Goni

The S3C RTC requires 32768 Hz clock as input which is provided by PMIC.
However there is no such clock provider but rather a regulator driver
which registers the clock as a regulator.  This is an old driver which
will not be updated so add a workaround - a fixed-clock to fill missing
clock phandle reference in S3C RTC.

This fixes dtbs_check warnings:

  rtc@e2800000: clocks: [[2, 145]] is too short
  rtc@e2800000: clock-names: ['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200907161141.31034-13-krzk@kernel.org

diff --git a/arch/arm/boot/dts/s5pv210-goni.dts b/arch/arm/boot/dts/s5pv210-goni.dts
index fbbd937..c8714bf 100644 (file)
--- a/arch/arm/boot/dts/s5pv210-goni.dts
+++ b/arch/arm/boot/dts/s5pv210-goni.dts
@@ -33,6 +33,13 @@
                        0x50000000 0x08000000>;
        };
 
+       pmic_ap_clk: clock-0 {
+               /* Workaround for missing clock on PMIC */
+               compatible = "fixed-clock";
+               #clock-cells = <0>;
+               clock-frequency = <32768>;
+       };
+
        regulators {
                compatible = "simple-bus";
                #address-cells = <1>;
@@ -224,6 +231,11 @@
                                        regulator-max-microvolt = <1200000>;
                                        regulator-always-on;
                                };
+
+                               ap32khz_reg: EN32KHz-AP {
+                                       regulator-name = "32KHz AP";
+                                       regulator-always-on;
+                               };
                        };
                };
        };
@@ -308,6 +320,11 @@
        status = "okay";
 };
 
+&rtc {
+       clocks = <&clocks CLK_RTC>, <&pmic_ap_clk>;
+       clock-names = "rtc", "rtc_src";
+};
+
 &sdhci0 {
        bus-width = <4>;
        non-removable;