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Message-ID: <YQM7Lm+KD7C5P6i+@robh.at.kernel.org>
Date: Thu, 29 Jul 2021 17:35:10 -0600
From: Rob Herring <robh@...nel.org>
To: Vignesh Raghavendra <vigneshr@...com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Lee Jones <lee.jones@...aro.org>,
Lars-Peter Clausen <lars@...afoo.de>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
linux-input@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: mfd: Convert ti-tsc-adc bindings to YAML
schema
On Mon, Jul 26, 2021 at 04:19:58PM +0530, Vignesh Raghavendra wrote:
> Convert ti-tsc-adc binding to YAML schema. This is MFD device with
> support for resistive touchscreen and ADC. But the txt binding file for
> MFD and ADC has been incorrectly been under input/touchscreen directory,
> so split the bindings across subsystems as appropriate.
>
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> ---
> .../bindings/iio/adc/ti,am3359-adc.yaml | 74 +++++++++++++++
> .../input/touchscreen/ti,am3359-tsc.yaml | 79 ++++++++++++++++
> .../bindings/input/touchscreen/ti-tsc-adc.txt | 91 ------------------
> .../bindings/mfd/ti,am3359-tscadc.yaml | 92 +++++++++++++++++++
> 4 files changed, 245 insertions(+), 91 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml
> create mode 100644 Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml
> delete mode 100644 Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
> create mode 100644 Documentation/devicetree/bindings/mfd/ti,am3359-tscadc.yaml
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml b/Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml
> new file mode 100644
> index 000000000000..b7884be5d378
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti,am3359-adc.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/adc/ti,am3359-adc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for ADC part of TSCADC MFDs on TI SoCs
> +
> +maintainers:
> + - Vignesh Raghavendra <vigneshr@...com>
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - enum:
> + - ti,am654-adc
> + - const: ti,am3359-adc
> + - const: ti,am3359-adc
> +
> + ti,adc-channels:
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description:
> + List of analog inputs available for ADC.
> + AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
> + minItems: 1
> + maxItems: 8
> + items:
> + maximum: 7
> +
> + ti,chan-step-opendelay:
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description:
> + List of open delays for each channel of list of analog inputs
> + available for ADC. ADC in the order of ti,adc-channels. The
> + value corresponds to the number of ADC clock cycles to wait
> + after applying the step configuration registers and before
> + sending the start of ADC conversion.
> + minItems: 1
> + maxItems: 8
> + items:
> + maximum: 0x3FFFF
> +
> + ti,chan-step-sampledelay:
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description:
> + List of sample delays for each channel of ADC in the order of
> + ti,adc-channels. The value corresponds to the number of
> + ADC clock cycles to sample (to hold start of conversion high).
> + minItems: 1
> + maxItems: 8
> + items:
> + maximum: 0xFF
> +
> + ti,chan-step-avg:
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description:
> + Number of averages to be performed for each channel of ADC. If
> + average is 16 then input is sampled 16 times and averaged to
> + get more accurate value. This increases the time taken by ADC
> + to generate a sample.
> + minItems: 1
> + maxItems: 8
> + items:
> + maximum: 16
> +
> + "#io-channel-cells":
> + const: 1
> +
> +required:
> + - compatible
> + - "#io-channel-cells"
> +
> +additionalProperties: false
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml b/Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml
> new file mode 100644
> index 000000000000..288f8d73b653
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/ti,am3359-tsc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for TSC part of TSCADC MFDs on TI SoCs
> +
> +maintainers:
> + - Vignesh Raghavendra <vigneshr@...com>
> +
> +properties:
> + compatible:
> + const: ti,am3359-tsc
> +
> + ti,wires:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [4, 5, 8]
> + description:
> + Number of wires used by touchscreen
> +
> + ti,x-plate-resistance:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + X plate resistance
> +
> + ti,coordinate-readouts:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 1
> + maximum: 5
> + description:
> + The sequencer supports a total of 16 programmable steps
> + each step is used to read a single coordinate. A single
> + readout is enough but multiple reads can increase the quality.
> + A value of 5 means, 5 reads for X, 5 for Y and 2 for Z (always).
> + This utilises 12 of the 16 software steps available.
> + The remaining 4 can be used by the ADC.
> +
> + ti,wire-config:
> + $ref: /schemas/types.yaml#/definitions/uint32-array
> + description: |
> + Different boards could have a different order for
> + connecting wires on touchscreen. We need to provide an
> + 8 bit number where in the 1st four bits represent the
> + analog lines and the next 4 bits represent positive/
> + negative terminal on that input line. Notations to
> + represent the input lines and terminals respectively
> + is as follows:
> + AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
> + XP = 0, XN = 1, YP = 2, YN = 3.
> + minItems: 4
> + items:
> + maximum: 0x73
> +
> + ti,charge-delay:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Length of touch screen charge delay step in terms of
> + List of analog inputs available for ADC.
> + ADC clock cycles. Charge delay value should be large
> + in order to avoid false pen-up events. This value
> + effects the overall sampling speed, hence need to be
> + kept as low as possible, while avoiding false pen-up
> + event. Start from a lower value, say 0x400, and
> + increase value until false pen-up events are avoided.
> + The pen-up detection happens immediately after the
> + charge step, so this does in fact function as a
> + hardware knob for adjusting the amount of "settling time".
> + minimum: 0x1
> + maximum: 0xFFFF
> +
> +required:
> + - compatible
> + - ti,wires
> + - ti,coordinate-readouts
> + - ti,wire-config
> + - ti,x-plate-resistance
> +
> +additionalProperties: false
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt b/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
> deleted file mode 100644
> index aad5e34965eb..000000000000
> --- a/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
> +++ /dev/null
> @@ -1,91 +0,0 @@
> -* TI - TSC ADC (Touschscreen and analog digital converter)
> -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> -
> -Required properties:
> -- mfd
> - compatible: Should be
> - "ti,am3359-tscadc" for AM335x/AM437x SoCs
> - "ti,am654-tscadc", "ti,am3359-tscadc" for AM654 SoCs
> -- child "tsc"
> - compatible: Should be "ti,am3359-tsc".
> - ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen
> - support on the platform.
> - ti,x-plate-resistance: X plate resistance
> - ti,coordinate-readouts: The sequencer supports a total of 16
> - programmable steps each step is used to
> - read a single coordinate. A single
> - readout is enough but multiple reads can
> - increase the quality.
> - A value of 5 means, 5 reads for X, 5 for
> - Y and 2 for Z (always). This utilises 12
> - of the 16 software steps available. The
> - remaining 4 can be used by the ADC.
> - ti,wire-config: Different boards could have a different order for
> - connecting wires on touchscreen. We need to provide an
> - 8 bit number where in the 1st four bits represent the
> - analog lines and the next 4 bits represent positive/
> - negative terminal on that input line. Notations to
> - represent the input lines and terminals resoectively
> - is as follows:
> - AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
> - XP = 0, XN = 1, YP = 2, YN = 3.
> -- child "adc"
> - compatible: Should be
> - "ti,am3359-adc" for AM335x/AM437x SoCs
> - "ti,am654-adc", "ti,am3359-adc" for AM654 SoCs
> - ti,adc-channels: List of analog inputs available for ADC.
> - AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
> -
> -Optional properties:
> -- child "tsc"
> - ti,charge-delay: Length of touch screen charge delay step in terms of
> - ADC clock cycles. Charge delay value should be large
> - in order to avoid false pen-up events. This value
> - effects the overall sampling speed, hence need to be
> - kept as low as possible, while avoiding false pen-up
> - event. Start from a lower value, say 0x400, and
> - increase value until false pen-up events are avoided.
> - The pen-up detection happens immediately after the
> - charge step, so this does in fact function as a
> - hardware knob for adjusting the amount of "settling
> - time".
> -
> -- child "adc"
> - ti,chan-step-opendelay: List of open delays for each channel of
> - ADC in the order of ti,adc-channels. The
> - value corresponds to the number of ADC
> - clock cycles to wait after applying the
> - step configuration registers and before
> - sending the start of ADC conversion.
> - Maximum value is 0x3FFFF.
> - ti,chan-step-sampledelay: List of sample delays for each channel
> - of ADC in the order of ti,adc-channels.
> - The value corresponds to the number of
> - ADC clock cycles to sample (to hold
> - start of conversion high).
> - Maximum value is 0xFF.
> - ti,chan-step-avg: Number of averages to be performed for each
> - channel of ADC. If average is 16 then input
> - is sampled 16 times and averaged to get more
> - accurate value. This increases the time taken
> - by ADC to generate a sample. Valid range is 0
> - average to 16 averages. Maximum value is 16.
> -
> -Example:
> - tscadc: tscadc@...0d000 {
> - compatible = "ti,am3359-tscadc";
> - tsc {
> - ti,wires = <4>;
> - ti,x-plate-resistance = <200>;
> - ti,coordiante-readouts = <5>;
> - ti,wire-config = <0x00 0x11 0x22 0x33>;
> - ti,charge-delay = <0x400>;
> - };
> -
> - adc {
> - ti,adc-channels = <4 5 6 7>;
> - ti,chan-step-opendelay = <0x098 0x3ffff 0x098 0x0>;
> - ti,chan-step-sampledelay = <0xff 0x0 0xf 0x0>;
> - ti,chan-step-avg = <16 2 4 8>;
> - };
> - }
> diff --git a/Documentation/devicetree/bindings/mfd/ti,am3359-tscadc.yaml b/Documentation/devicetree/bindings/mfd/ti,am3359-tscadc.yaml
> new file mode 100644
> index 000000000000..61854b61e378
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/ti,am3359-tscadc.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/ti,am3359-tscadc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for Touchscreen + ADC MFD IPs on TI SoCs
> +
> +maintainers:
> + - Vignesh Raghavendra <vigneshr@...com>
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - enum:
> + - ti,am654-tscadc
> + - const: ti,am3359-tscadc
> + - const: ti,am3359-tscadc
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + const: "adc_tsc_fck"
Don't need quotes
> +
> + dmas:
> + maxItems: 2
> +
> + dma-names:
> + items:
> + - const: fifo0
> + - const: fifo1
> +
> + power-domains: true
> +
> + tsc:
> + $ref: ../input/touchscreen/ti,am3359-tsc.yaml
/schemas/input/...
> + description:
> + Bindings for Touchscreen part of the MFD
> +
> + adc:
> + $ref: ../iio/adc/ti,am3359-adc.yaml
/schemas/iio/...
> + description:
> + Bindings for ADC part of the MFD
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> +
> +additionalProperties: false
> +
> +if:
> + properties:
> + compatible:
> + contains:
> + const: ti,am654-tscadc
> +then:
> + properties:
> + tsc: false
> +
> +examples:
> + - |
> + tscadc@...0d000 {
> + compatible = "ti,am3359-tscadc";
> + reg = <0x44e0d000 0x1000>;
> + interrupts = <16>;
> + tsc {
indentation is off
> + compatible = "ti,am3359-tsc";
> + ti,wires = <4>;
> + ti,x-plate-resistance = <200>;
> + ti,coordinate-readouts = <5>;
> + ti,wire-config = <0x00 0x11 0x22 0x33>;
> + ti,charge-delay = <0x400>;
> + };
> +
> + adc {
> + compatible = "ti,am3359-adc";
> + ti,adc-channels = <4 5 6 7>;
> + ti,chan-step-opendelay = <0x098 0x3ffff 0x098 0x0>;
> + ti,chan-step-sampledelay = <0xff 0x0 0xf 0x0>;
> + ti,chan-step-avg = <16 2 4 8>;
> + #io-channel-cells = <1>;
> + };
> + };
With those few nits fixed,
Reviewed-by: Rob Herring <robh@...nel.org>
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