[PATCH] arm64: dts: imx8mm: Model PMIC to SNVS RTC clock path on Data Modul i.MX8M Mini eDM SBC

[Marek Vasut]

The PMIC is the 32 kHz clock source for the RTC_XTALI input of the SoC
on this system. The RTC_XTALI input is used to supply 32 kHz clock to
the SVNS RTC per "i.MX 8M Mini Applications Processor Reference Manual,
Rev. 3, 11/2020" page 759 "The 32KHz XTAL module uses a different IP and
it is used as the clock source for the RTC, located in the SNVS." The
PMIC has its own dedicated 32 kHz XTAL on input.

Model the connection in DT.

Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Fabio Estevam <festevam at denx.de>
Cc: NXP Linux Team <linux-imx at nxp.com>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Shawn Guo <shawnguo at kernel.org>
To: linux-arm-kernel at lists.infradead.org
---
 .../dts/freescale/imx8mm-data-modul-edm-sbc.dts     | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc.dts b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc.dts
index 6ff30cbb32fb2..575d5632296c5 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-data-modul-edm-sbc.dts
@@ -53,6 +53,12 @@ clk_xtal25: clk-xtal25 {
 		clock-frequency = <25000000>;
 	};
 
+	clk_xtal32k: clk-xtal32k {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+	};
+
 	panel: panel {
 		backlight = <&backlight>;
 		power-supply = <&reg_panel_vcc>;
@@ -276,6 +282,9 @@ &i2c1 {
 	pmic: pmic at 4b {
 		compatible = "rohm,bd71847";
 		reg = <0x4b>;
+		#clock-cells = <0>;
+		clocks = <&clk_xtal32k 0>;
+		clock-output-names = "clk-32k-out";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_pmic>;
 		interrupt-parent = <&gpio1>;
@@ -942,6 +951,10 @@ &sai5 {
 	status = "disabled";
 };
 
+&snvs_rtc {
+	clocks = <&pmic>;
+};
+
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;
-- 
2.35.1