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

[Peng Fan]

On 9/25/2022 1:46 AM, Marek Vasut wrote:
> 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>

Reviewed-by: Peng Fan <peng.fan at nxp.com>

> ---
> 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>;