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    Subject[PATCH 04/33] ARM: dts: exynos: Correct S3C RTC bindings and enable it in Origen
    Date
    The S3C RTC requires 32768 Hz clock as input which is provided by PMIC
    (Maxim MAX8997). However there is no clock provided for the PMIC and
    the driver registers the clock as regulator. This is an old driver
    which will not be updated so add a workaround:
    1. Enable the "clock" regulator in PMIC,
    2. Add a fixed-clock to fill missing clock phandle reference in S3C RTC.

    This allows to enable the S3C RTC and fixes dtbs_check warnings:

    arch/arm/boot/dts/exynos4210-origen.dt.yaml: rtc@10070000: clocks: [[5, 346]] is too short
    arch/arm/boot/dts/exynos4210-origen.dt.yaml: rtc@10070000: clock-names: ['rtc'] is too short

    Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
    ---
    arch/arm/boot/dts/exynos4210-origen.dts | 14 ++++++++++++++
    1 file changed, 14 insertions(+)

    diff --git a/arch/arm/boot/dts/exynos4210-origen.dts b/arch/arm/boot/dts/exynos4210-origen.dts
    index 890525b10d22..747221bbb856 100644
    --- a/arch/arm/boot/dts/exynos4210-origen.dts
    +++ b/arch/arm/boot/dts/exynos4210-origen.dts
    @@ -100,6 +100,13 @@
    compatible = "samsung,clock-xusbxti";
    clock-frequency = <24000000>;
    };
    +
    + pmic_ap_clk: pmic-ap-clk {
    + /* Workaround for missing clock on max8997 PMIC */
    + compatible = "fixed-clock";
    + #clock-cells = <0>;
    + clock-frequency = <32768>;
    + };
    };

    display-timings {
    @@ -286,6 +293,11 @@
    regulator-boot-on;
    regulator-always-on;
    };
    +
    + EN32KHZ_AP {
    + regulator-name = "EN32KHZ_AP";
    + regulator-always-on;
    + };
    };
    };
    };
    @@ -331,6 +343,8 @@

    &rtc {
    status = "okay";
    + clocks = <&clock CLK_RTC>, <&pmic_ap_clk>;
    + clock-names = "rtc", "rtc_src";
    };

    &tmu {
    --
    2.17.1
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