Subject: [PATCH v2 1/4] dt-bindings: iio: adc: Add Xilinx AMS binding documentation

From: [email-masked] (Jonathan Cameron)
Date: Sun, 16 Sep 2018 11:01:20 +0100

On Fri, 14 Sep 2018 12:48:27 +0530
Manish Narani <[email-masked]> wrote:

> Xilinx AMS have several ADC channels that can be used for measurement of
> different voltages and temperatures. Document the same in the bindings.
> 
> Signed-off-by: Manish Narani <[email-masked]>
> ---
>  .../devicetree/bindings/iio/adc/xilinx-ams.txt     | 180 +++++++++++++++++++++
>  1 file changed, 180 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/xilinx-ams.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/xilinx-ams.txt b/Documentation/devicetree/bindings/iio/adc/xilinx-ams.txt
> new file mode 100644
> index 0000000..d0958a1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/xilinx-ams.txt
> @@ -0,0 +1,180 @@
> +Xilinx AMS controller
> +`````````````````````
> +The AMS includes an ADC as well as on-chip sensors that can be used to
> +sample external voltages and monitor on-die operating conditions, such as
> +temperature and supply voltage levels.
> +The AMS has two SYSMON blocks which are PL (Programmable Logic) SYSMON and
> +PS (Processing System) SYSMON.
> +All designs should have AMS registers, but PS and PL are optional. The
> +AMS controller can work with only PS, only PL and both PS and PL
> +configurations. Please specify registers according to your design. Devicetree
> +should always have AMS module property. Providing PS & PL module is optional.
> +
> +Required properties:
> +	- compatible: Should be "xlnx,zynqmp-ams"
> +	- reg: Should specify AMS register space
> +	- interrupts: Interrupt number for the AMS control interface
> +	- interrupt-names: Interrupt name, must be "ams-irq"
> +	- clocks: Should contain a clock specifier for the device
> +	- ranges: keep the property empty to map child address space
> +	          (for PS and/or PL) nodes 1:1 onto the parent address
> +	          space
> +
> +	AMS sub-nodes:
> +		- ams_ps : Used as PS-SYSMON node
> +		- ams_pl : Used as PL-SYSMON node
> +
> +
> +
> +AMS PS-SYSMON
> +`````````````
> +PS (Processing System) SYSMON is memory mapped to PS. This block has built-in
> +alarm generation logic that is used to interrupt the processor based on
> +condition set.
> +
> +Required properties:
> +	- compatible: Should be "xlnx,zynqmp-ams-ps"
> +	- reg: Register space for PS-SYSMON
> +
> +
> +
> +AMS PL-SYSMON
> +`````````````
> +PL-SYSMON is capable of monitoring off chip voltage and temperature. PL-SYSMON
> +block has DRP, JTAG and I2C interface to enable monitoring from external master.
> +Out of this interface currently only DRP is supported. This block has alarm
> +generation logic that is used to interrupt the processor based on condition set.
> +
> +Required properties:
> +	- compatible: Should be "xlnx,zynqmp-ams-pl"
> +	- reg: Register space for PL-SYSMON
> +
> +PL-SYSMON optional sub-nodes:
> +	- xlnx,ext-channels: List of external channels that are connected to the
> +	                     AMS PL module.
> +
> +	  The child nodes of PL-SYSMON represent the external channels which are
> +	  connected to this Module. If the property is not present
> +	  no external channels will be assumed to be connected.
> +
> +	  Each child node represents one channel and has the following
> +	  properties:
> +
> +	Required properties:
> +		* reg: Pair of pins the channel is connected to.
> +
> +		    'reg' value		Channel Name		Channel Number
> +		    -----------		------------		--------------
> +			 0		VP/VN			      30
> +			 1		VUSER0			      31
> +			 2		VUSER1			      32
> +			 3		VUSER3			      33
> +			 4		VUSER4			      34
> +			 5		VAUXP[0]/VAUXN[0]	      35
> +			 6		VAUXP[1]/VAUXN[1]	      36
> +			...
> +			20		VAUXP[15]/VAUXN[15]	      50
> +
> +		Each channel number should only be used at most once. For
> +		more details on channels, refer table given at the end.
> +
> +	Optional properties:
> +		* xlnx,bipolar: If set the channel is used in bipolar
> +		  mode.
> +
> +
> +Example:
> +	xilinx_ams: ams at ffa50000 {
> +		compatible = "xlnx,zynqmp-ams";
> +		interrupt-parent = <&gic>;
> +		interrupts = <0 56 4>;
> +		interrupt-names = "ams-irq";
> +		clocks = <&clkc 70>;
> +		reg = <0x0 0xffa50000 0x0 0x800>;
> +		reg-names = "ams-base";
> +		ranges;
> +
> +		ams_ps: ams_ps at ffa50800 {
> +			compatible = "xlnx,zynqmp-ams-ps";
> +			reg = <0x0 0xffa50800 0x0 0x400>;

Rob Herring mentioned this in the previous version.
Why 64 bit addresses?

Also this isn't how I understand ranges to be used...

https://elinux.org/Device_Tree_Usage#Ranges_.28Address_Translation.29

> +		};
> +
> +		ams_pl: ams_pl at ffa50c00 {
> +			compatible = "xlnx,zynqmp-ams-pl";
> +			reg = <0x0 0xffa50c00 0x0 0x400>;
> +			xlnx,ext-channels {
> +				channel at 0 {
> +					reg = <0>;
> +					xlnx,bipolar;
> +				};
> +				channel at 1 {
> +					reg = <1>;
> +				};
> +				channel at 8 {
> +					reg = <8>;
> +					xlnx,bipolar;
> +				};
> +			};
> +		};
> +	};
> +
> +
> +AMS Channels Details
> +````````````````````
> +Sysmon Block	|Channel|			Details					|Measurement
> +		 Number									 Type
> +---------------------------------------------------------------------------------------------------------
> +AMS CTRL	|0	|System PLLs voltage measurement, VCC_PSPLL.			|Voltage
> +		|1	|Battery voltage measurement, VCC_PSBATT.			|Voltage
> +		|2	|PL Internal voltage measurement, VCCINT.			|Voltage
> +		|3	|Block RAM voltage measurement, VCCBRAM.			|Voltage
> +		|4	|PL Aux voltage measurement, VCCAUX.				|Voltage
> +		|5	|Voltage measurement for six DDR I/O PLLs, VCC_PSDDR_PLL.	|Voltage
> +		|6	|VCC_PSINTFP_DDR voltage measurement.				|Voltage
> +---------------------------------------------------------------------------------------------------------
> +PS Sysmon	|7	|LPD temperature measurement.					|Temperature
> +		|8	|FPD Temperature Measurment (REMOTE).				|Temperature
> +		|9	|VCC PS LPD voltage measurement (supply1).			|Voltage
> +		|10	|VCC PS FPD voltage measurement (supply2).			|Voltage
> +		|11	|PS Aux voltage reference (supply3).				|Voltage
> +		|12	|DDR I/O VCC voltage measurement.				|Voltage
> +		|13	|PS IO Bank 503 voltage measurement (supply5).			|Voltage
> +		|14	|PS IO Bank 500 voltage measurement (supply6).			|Voltage
> +		|15	|VCCO_PSIO1 voltage measurement.				|Voltage
> +		|16	|VCCO_PSIO2 voltage measurement.				|Voltage
> +		|17	|VCC_PS_GTR voltage measurement (VPS_MGTRAVCC).			|Voltage
> +		|18	|VTT_PS_GTR voltage measurement (VPS_MGTRAVTT).			|Voltage
> +		|19	|VCC_PSADC voltage measurement.					|Voltage
> +---------------------------------------------------------------------------------------------------------
> +PL Sysmon	|20	|PL Temperature measurement.					|Temperature
> +		|21	|PL Internal Voltage Voltage measurement, VCCINT.		|Voltage
> +		|22	|PL Auxiliary Voltage measurement, VCCAUX.			|Voltage
> +		|23	|ADC Reference P+ Voltage measurement.				|Voltage
> +		|24	|ADC Reference N- Voltage measurement.				|Voltage
> +		|25	|PL Block RAM Voltage measurement, VCCBRAM.			|Voltage
> +		|26	|LPD Internal Voltage measurement, VCC_PSINTLP (supply4).	|Voltage
> +		|27	|FPD Internal Voltage measurement, VCC_PSINTFP (supply5).	|Voltage
> +		|28	|PS Auxiliary Voltage measurement (supply6).			|Voltage
> +		|29	|PL VCCADC Voltage measurement (vccams).			|Voltage
> +		|30	|Differencial analog input signal Voltage measurment.		|Voltage
> +		|31	|VUser0 Voltage measurement (supply7).				|Voltage
> +		|32	|VUser1 Voltage measurement (supply8).				|Voltage
> +		|33	|VUser2 Voltage measurement (supply9).				|Voltage
> +		|34	|VUser3 Voltage measurement (supply10).				|Voltage
> +		|35	|Auxiliary ch 0 Voltage measurement (VAux0).			|Voltage
> +		|36	|Auxiliary ch 1 Voltage measurement (VAux1).			|Voltage
> +		|37	|Auxiliary ch 2 Voltage measurement (VAux2).			|Voltage
> +		|38	|Auxiliary ch 3 Voltage measurement (VAux3).			|Voltage
> +		|39	|Auxiliary ch 4 Voltage measurement (VAux4).			|Voltage
> +		|40	|Auxiliary ch 5 Voltage measurement (VAux5).			|Voltage
> +		|41	|Auxiliary ch 6 Voltage measurement (VAux6).			|Voltage
> +		|42	|Auxiliary ch 7 Voltage measurement (VAux7).			|Voltage
> +		|43	|Auxiliary ch 8 Voltage measurement (VAux8).			|Voltage
> +		|44	|Auxiliary ch 9 Voltage measurement (VAux9).			|Voltage
> +		|45	|Auxiliary ch 10 Voltage measurement (VAux10).			|Voltage
> +		|46	|Auxiliary ch 11 Voltage measurement (VAux11).			|Voltage
> +		|47	|Auxiliary ch 12 Voltage measurement (VAux12).			|Voltage
> +		|48	|Auxiliary ch 13 Voltage measurement (VAux13).			|Voltage
> +		|49	|Auxiliary ch 14 Voltage measurement (VAux14).			|Voltage
> +		|50	|Auxiliary ch 15 Voltage measurement (VAux15).			|Voltage
> +---------------------------------------------------------------------------------------------------------