linux-kernel - Re: [PATCH v12 2/5] arm64: zynqmp: DT: Add Xilinx AMS node

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Message-ID: <20220119115113.GA26036@pengutronix.de>
Date:   Wed, 19 Jan 2022 12:51:13 +0100
From:   Michael Tretter <m.tretter@...gutronix.de>
To:     Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
Cc:     linux-kernel@...r.kernel.org, jic23@...nel.org, lars@...afoo.de,
        linux-iio@...r.kernel.org, git@...inx.com, michals@...inx.com,
        gregkh@...uxfoundation.org, rafael@...nel.org,
        linux-acpi@...r.kernel.org, heikki.krogerus@...ux.intel.com,
        Manish Narani <manish.narani@...inx.com>
Subject: Re: [PATCH v12 2/5] arm64: zynqmp: DT: Add Xilinx AMS node

On Fri, 03 Dec 2021 21:23:55 +0000, Anand Ashok Dumbre wrote:
> The Xilinx AMS includes an ADC as well as on-chip sensors that can be
> used to sample external and monitor on-die operating conditions, such as
> temperature and supply voltage levels.
> 
> Co-developed-by: Manish Narani <manish.narani@...inx.com>
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> Signed-off-by: Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>
> ---
>  arch/arm64/boot/dts/xilinx/zynqmp.dtsi | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> index 74e66443e4ce..ab96708fe65e 100644
> --- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> +++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> @@ -878,6 +878,30 @@
>  			timeout-sec = <10>;
>  		};
>  
> +		xilinx_ams: ams@...50000 {
> +			compatible = "xlnx,zynqmp-ams";
> +			status = "disabled";
> +			interrupt-parent = <&gic>;
> +			interrupts = <0 56 4>;
> +			reg = <0x0 0xffa50000 0x0 0x800>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			#io-channel-cells = <1>;
> +			ranges = <0 0 0xffa50800 0x800>;
> +
> +			ams_ps: ams-ps@0 {
> +				compatible = "xlnx,zynqmp-ams-ps";
> +				status = "disabled";
> +				reg = <0 0x400>;
> +			};
> +
> +			ams_pl: ams-pl@400 {
> +				compatible = "xlnx,zynqmp-ams-pl";
> +				status = "disabled";
> +				reg = <0x400 0x400>;
> +			};
> +		};
> +

The patch should also add the xilinx_ams node to
arch/arm64/boot/dts/xilinx/zynqmp-clk-ccf.dtsi as:

	&xilinx_ams {
		clocks = <&zynqmp_clk AMS_REF>;
	};

Otherwise the driver fails to find the clock during probe.

Michael

>  		zynqmp_dpdma: dma-controller@...c0000 {
>  			compatible = "xlnx,zynqmp-dpdma";
>  			status = "disabled";
> -- 
> 2.17.1