[meta-xilinx] ZynqMP XADC in default DTS?

[Jean-Francois Dagenais]

> On Jul 18, 2017, at 16:39, Giordon Stark <kratsg at gmail.com> wrote:
> 
> Hi all,
> 
> In the Zynq-7000 series, the default DTS provided here (https://github.com/Xilinx/linux-xlnx/blob/1aacedaf5318e8ae39cc02916647495c1c2992ab/arch/arm/boot/dts/zynq-7000.dtsi#L77-L83 <https://github.com/Xilinx/linux-xlnx/blob/1aacedaf5318e8ae39cc02916647495c1c2992ab/arch/arm/boot/dts/zynq-7000.dtsi#L77-L83>) comes with XADC baked in by default...
> 
> However, in the ZynqMP series, the default DTS provided here (https://github.com/Xilinx/linux-xlnx/blob/1aacedaf5318e8ae39cc02916647495c1c2992ab/arch/arm64/boot/dts/xilinx/zynqmp.dtsi <https://github.com/Xilinx/linux-xlnx/blob/1aacedaf5318e8ae39cc02916647495c1c2992ab/arch/arm64/boot/dts/xilinx/zynqmp.dtsi>) does not come with XADC baked in. It's not clear to me how to add this in using a "default project" (MPSoC process IPCore with PS-PL clocks disabled) and the system.dtb provided by the zcu102-zynqmp machine option in bitbake.
> 
> Would I, instead, need to add the XADC IP Core into my project, and then look at the physical addresses and figure out how to add it in my DTS? Or is there some other way to do it with the default machine, or should I be making my own machine+dts files?

I think the equivalent is the "sysmon" or "AMS" in zynqmp...

If it helps, this is what I have in "my-machine.dts" (fake name) :

#include "zynqmp.dtsi"

[...]

&xilinx_ams {
	status = "okay";
	#io-channel-cells = <1>;
};

&ams_ps {
	status = "okay";
};

&ams_pl {
	status = "okay";
	reg = <0x0 0x81080400 0x0 0x400>;
	xlnx,ext-channels {
		#address-cells = <1>;
		#size-cells = <0>;
		channel at AMS_PL_OPT_VCCVPVN {
			reg = <AMS_PL_OPT_VCCVPVN>;
			#define MY_MACHINE_VCC3V3 23
		};
		channel at AMS_PL_OPT_VCCAUX3 {
			reg = <AMS_PL_OPT_VCCAUX3>;
			#define MY_MACHINE_VCC1V2 24
		};
		channel at AMS_PL_OPT_VCCAUX11 {
			reg = <AMS_PL_OPT_VCCAUX11>;
			#define MY_MACHINE_VCC5V 25
		};
		channel at AMS_PL_OPT_VCCAUX6 {
			reg = <AMS_PL_OPT_VCCAUX6>;
			#define MY_MACHINE_HV_VC 26
		};
	};
};

The channel configs in PL are specific to our design. And we export those through iio-hwmon to get them with "lmsensors":

/ {
	iio-hwmon at 0 {
		compatible = "iio-hwmon";
		io-channels = <&xilinx_ams AMS_REMOTE_TEMP>,
				<&xilinx_ams AMS_PL_TEMP>,
				<&xilinx_ams AMS_VCCPSINTFP>,
				<&xilinx_ams AMS_VCCPSDDR>,
				<&xilinx_ams MY_MACHINE_VCC1V2>,
				<&xilinx_ams AMS_VCCPSAUX>,
				<&xilinx_ams AMS_VCCPSIO0>,
				<&xilinx_ams MY_MACHINE_VCC3V3>,
				<&xilinx_ams AMS_VCCPSIO2>,
				<&xilinx_ams MY_MACHINE_VCC5V>,
				<&xilinx_ams MY_MACHINE_HV_VC>;
		io-channel-names = "CPU",
				"FPGA",
				"VCC0V85",
				"VCC1V1",
				"VCC1V2",
				"VCC1V8",
				"VCC1V8IO",
				"VCC3V3",
				"VCC3V3IO",
				"VCC5V",
				"HV_VC";
	};

};

Cheers!
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