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Date: Mon, 1 Jul 2024 09:03:51 -0600
From: Rob Herring <robh@...nel.org>
To: Manikandan Muralidharan <manikandan.m@...rochip.com>
Cc: linus.walleij@...aro.org, brgl@...ev.pl, krzk+dt@...nel.org,
conor+dt@...nel.org, nicolas.ferre@...rochip.com,
alexandre.belloni@...tlin.com, claudiu.beznea@...on.dev,
arnd@...db.de, durai.manickamkr@...rochip.com,
linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/5] dt-bindings: pinctrl: Convert Atmel PIO3 pinctrl
to json-schema
On Tue, Jun 25, 2024 at 10:05:25AM +0530, Manikandan Muralidharan wrote:
> Convert Atmel PIO3 pinctrl binding document to DT schema format
> json-schema.
>
> Signed-off-by: Manikandan Muralidharan <manikandan.m@...rochip.com>
> ---
> changes in v2:
>
> - Fix bot errors by fixing issues in 4/5
> - remove qoutes from $ref
> ---
> .../bindings/pinctrl/atmel,at91-pinctrl.txt | 178 ----------------
> .../pinctrl/atmel,at91rm9200-pinctrl.yaml | 194 ++++++++++++++++++
> 2 files changed, 194 insertions(+), 178 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
> create mode 100644 Documentation/devicetree/bindings/pinctrl/atmel,at91rm9200-pinctrl.yaml
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
> deleted file mode 100644
> index 0aa1a53012d6..000000000000
> --- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
> +++ /dev/null
> @@ -1,178 +0,0 @@
> -* Atmel AT91 Pinmux Controller
> -
> -The AT91 Pinmux Controller, enables the IC
> -to share one PAD to several functional blocks. The sharing is done by
> -multiplexing the PAD input/output signals. For each PAD there are up to
> -8 muxing options (called periph modes). Since different modules require
> -different PAD settings (like pull up, keeper, etc) the controller controls
> -also the PAD settings parameters.
> -
> -Please refer to pinctrl-bindings.txt in this directory for details of the
> -common pinctrl bindings used by client devices, including the meaning of the
> -phrase "pin configuration node".
> -
> -Atmel AT91 pin configuration node is a node of a group of pins which can be
> -used for a specific device or function. This node represents both mux and config
> -of the pins in that group. The 'pins' selects the function mode(also named pin
> -mode) this pin can work on and the 'config' configures various pad settings
> -such as pull-up, multi drive, etc.
> -
> -Required properties for iomux controller:
> -- compatible: "atmel,at91rm9200-pinctrl" or "atmel,at91sam9x5-pinctrl"
> - or "atmel,sama5d3-pinctrl" or "microchip,sam9x60-pinctrl"
> - or "microchip,sam9x7-pinctrl", "microchip,sam9x60-pinctrl"
> -- atmel,mux-mask: array of mask (periph per bank) to describe if a pin can be
> - configured in this periph mode. All the periph and bank need to be describe.
> -
> -How to create such array:
> -
> -Each column will represent the possible peripheral of the pinctrl
> -Each line will represent a pio bank
> -
> -Take an example on the 9260
> -Peripheral: 2 ( A and B)
> -Bank: 3 (A, B and C)
> -=>
> -
> - /* A B */
> - 0xffffffff 0xffc00c3b /* pioA */
> - 0xffffffff 0x7fff3ccf /* pioB */
> - 0xffffffff 0x007fffff /* pioC */
> -
> -For each peripheral/bank we will describe in a u32 if a pin can be
> -configured in it by putting 1 to the pin bit (1 << pin)
> -
> -Let's take the pioA on peripheral B
> -From the datasheet Table 10-2.
> -Peripheral B
> -PA0 MCDB0
> -PA1 MCCDB
> -PA2
> -PA3 MCDB3
> -PA4 MCDB2
> -PA5 MCDB1
> -PA6
> -PA7
> -PA8
> -PA9
> -PA10 ETX2
> -PA11 ETX3
> -PA12
> -PA13
> -PA14
> -PA15
> -PA16
> -PA17
> -PA18
> -PA19
> -PA20
> -PA21
> -PA22 ETXER
> -PA23 ETX2
> -PA24 ETX3
> -PA25 ERX2
> -PA26 ERX3
> -PA27 ERXCK
> -PA28 ECRS
> -PA29 ECOL
> -PA30 RXD4
> -PA31 TXD4
> -
> -=> 0xffc00c3b
> -
> -Required properties for pin configuration node:
> -- atmel,pins: 4 integers array, represents a group of pins mux and config
> - setting. The format is atmel,pins = <PIN_BANK PIN_BANK_NUM PERIPH CONFIG>.
> - The PERIPH 0 means gpio, PERIPH 1 is periph A, PERIPH 2 is periph B...
> - PIN_BANK 0 is pioA, PIN_BANK 1 is pioB...
> -
> -Bits used for CONFIG:
> -PULL_UP (1 << 0): indicate this pin needs a pull up.
> -MULTIDRIVE (1 << 1): indicate this pin needs to be configured as multi-drive.
> - Multi-drive is equivalent to open-drain type output.
> -DEGLITCH (1 << 2): indicate this pin needs deglitch.
> -PULL_DOWN (1 << 3): indicate this pin needs a pull down.
> -DIS_SCHMIT (1 << 4): indicate this pin needs to the disable schmitt trigger.
> -DRIVE_STRENGTH (3 << 5): indicate the drive strength of the pin using the
> - following values:
> - 00 - No change (reset state value kept)
> - 01 - Low
> - 10 - Medium
> - 11 - High
> -OUTPUT (1 << 7): indicate this pin need to be configured as an output.
> -OUTPUT_VAL (1 << 8): output val (1 = high, 0 = low)
> -SLEWRATE (1 << 9): slew rate of the pin: 0 = disable, 1 = enable
> -DEBOUNCE (1 << 16): indicate this pin needs debounce.
> -DEBOUNCE_VAL (0x3fff << 17): debounce value.
> -
> -NOTE:
> -Some requirements for using atmel,at91rm9200-pinctrl binding:
> -1. We have pin function node defined under at91 controller node to represent
> - what pinmux functions this SoC supports.
> -2. The driver can use the function node's name and pin configuration node's
> - name describe the pin function and group hierarchy.
> - For example, Linux at91 pinctrl driver takes the function node's name
> - as the function name and pin configuration node's name as group name to
> - create the map table.
> -3. Each pin configuration node should have a phandle, devices can set pins
> - configurations by referring to the phandle of that pin configuration node.
> -4. The gpio controller must be describe in the pinctrl simple-bus.
> -
> -For each bank the required properties are:
> -- compatible: "atmel,at91sam9x5-gpio" or "atmel,at91rm9200-gpio" or
> - "microchip,sam9x60-gpio"
> - or "microchip,sam9x7-gpio", "microchip,sam9x60-gpio", "atmel,at91rm9200-gpio"
> -- reg: physical base address and length of the controller's registers
> -- interrupts: interrupt outputs from the controller
> -- interrupt-controller: marks the device node as an interrupt controller
> -- #interrupt-cells: should be 2; refer to ../interrupt-controller/interrupts.txt
> - for more details.
> -- gpio-controller
> -- #gpio-cells: should be 2; the first cell is the GPIO number and the second
> - cell specifies GPIO flags as defined in <dt-bindings/gpio/gpio.h>.
> -- clocks: bank clock
> -
> -Examples:
> -
> -pinctrl@...ff400 {
> - #address-cells = <1>;
> - #size-cells = <1>;
> - ranges;
> - compatible = "atmel,at91rm9200-pinctrl", "simple-bus";
> - reg = <0xfffff400 0x600>;
> -
> - pioA: gpio@...ff400 {
> - compatible = "atmel,at91sam9x5-gpio";
> - reg = <0xfffff400 0x200>;
> - interrupts = <2 IRQ_TYPE_LEVEL_HIGH 1>;
> - #gpio-cells = <2>;
> - gpio-controller;
> - interrupt-controller;
> - #interrupt-cells = <2>;
> - clocks = <&pmc PMC_TYPE_PERIPHERAL 2>;
> - };
> -
> - atmel,mux-mask = <
> - /* A B */
> - 0xffffffff 0xffc00c3b /* pioA */
> - 0xffffffff 0x7fff3ccf /* pioB */
> - 0xffffffff 0x007fffff /* pioC */
> - >;
> -
> - /* shared pinctrl settings */
> - dbgu {
> - pinctrl_dbgu: dbgu-0 {
> - atmel,pins =
> - <1 14 0x1 0x0 /* PB14 periph A */
> - 1 15 0x1 0x1>; /* PB15 periph A with pullup */
> - };
> - };
> -};
> -
> -dbgu: serial@...ff200 {
> - compatible = "atmel,at91sam9260-usart";
> - reg = <0xfffff200 0x200>;
> - interrupts = <1 4 7>;
> - pinctrl-names = "default";
> - pinctrl-0 = <&pinctrl_dbgu>;
> -};
> diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91rm9200-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/atmel,at91rm9200-pinctrl.yaml
> new file mode 100644
> index 000000000000..0ed71e22384c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91rm9200-pinctrl.yaml
> @@ -0,0 +1,194 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/atmel,at91rm9200-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip PIO3 Pinmux Controller
> +
> +maintainers:
> + - Manikandan Muralidharan <manikandan.m@...rochip.com>
> +
> +description:
> + The AT91 Pinmux Controller, enables the IC to share one PAD to several
> + functional blocks. The sharing is done by multiplexing the PAD input/output
> + signals. For each PAD there are up to 8 muxing options (called periph modes).
> + Since different modules require different PAD settings (like pull up, keeper,
> + etc) the controller controls also the PAD settings parameters.
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - enum:
> + - atmel,at91rm9200-pinctrl
> + - atmel,at91sam9x5-pinctrl
> + - atmel,sama5d3-pinctrl
> + - microchip,sam9x60-pinctrl
> + - const: simple-mfd
> + - items:
> + - enum:
> + - microchip,sam9x7-pinctrl
> + - const: microchip,sam9x60-pinctrl
> + - const: simple-mfd
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 1
> +
> + ranges: true
> +
> + atmel,mux-mask:
> + $ref: /schemas/types.yaml#/definitions/uint32-matrix
Is there no constraint on the dimensions? Always sets of 2 or 3 entries?
Maybe better to not specify because the tools have some issues if the
dimensions are variable.
> + description: |
> + Array of mask (periph per bank) to describe if a pin can be
> + configured in this periph mode. All the periph and bank need to
> + be described.
> +
> + #How to create such array:
> +
> + Each column will represent the possible peripheral of the pinctrl
> + Each line will represent a pio bank
> +
> + #Example:
> +
> + In at91sam9260.dtsi,
> + Peripheral: 2 ( A and B)
> + Bank: 3 (A, B and C)
> +
> + # A B
> + 0xffffffff 0xffc00c3b # pioA
> + 0xffffffff 0x7fff3ccf # pioB
> + 0xffffffff 0x007fffff # pioC
> +
> + For each peripheral/bank we will describe in a u32 if a pin can be
> + configured in it by putting 1 to the pin bit (1 << pin)
> +
> + Let's take the pioA on peripheral B whose value is 0xffc00c3b
> + From the datasheet Table 10-2.
> + Peripheral B
> + PA0 MCDB0
> + PA1 MCCDB
> + PA2
> + PA3 MCDB3
> + PA4 MCDB2
> + PA5 MCDB1
> + PA6
> + PA7
> + PA8
> + PA9
> + PA10 ETX2
> + PA11 ETX3
> + PA12
> + PA13
> + PA14
> + PA15
> + PA16
> + PA17
> + PA18
> + PA19
> + PA20
> + PA21
> + PA22 ETXER
> + PA23 ETX2
> + PA24 ETX3
> + PA25 ERX2
> + PA26 ERX3
> + PA27 ERXCK
> + PA28 ECRS
> + PA29 ECOL
> + PA30 RXD4
> + PA31 TXD4
> +
> +patternProperties:
> + '^[a-z0-9-_]+$':
> + description:
> + A pinctrl node should contain at least one subnode representing the
> + pinctrl group available on the machine.
type: object
> + additionalProperties: false
> +
> + patternProperties:
> + '^[a-z0-9-_]+$':
> + type: object
> + properties:
> + atmel,pins:
> + $ref: /schemas/types.yaml#/definitions/uint32-matrix
> + description: |
> + Each entry consists of 4 integers and represents the pins
> + mux and config setting.The format is
> + atmel,pins = <PIN_BANK PIN_BANK_NUM PERIPH CONFIG>.
> + Supported pin number and mux varies for different SoCs, and
> + are defined in <include/dt-bindings/pinctrl/at91.h>.
> + items:
> + items:
> + - description:
> + Pin bank
> + - description:
> + Pin bank index
> + - description:
> + Peripheral function
> + - description:
> + Pad configuration
> +
> + required:
> + - atmel,pins
> +
> + additionalProperties: false
> +
> + 'gpio@[0-9a-f]*$':
'*' means 0 or more. You need '+' for 1 or more
> + $ref: "/schemas/gpio/atmel,at91rm9200-gpio.yaml"
Don't need quotes. yamllint should have told you this.
> + unevaluatedProperties: false
> +
> +allOf:
> + - $ref: pinctrl.yaml#
> +
> +required:
> + - compatible
> + - ranges
> + - "#address-cells"
> + - "#size-cells"
> + - atmel,mux-mask
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/at91.h>
> + #include <dt-bindings/interrupt-controller/irq.h>
> + #include <dt-bindings/pinctrl/at91.h>
> +
> + pinctrl@...ff400 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + compatible = "atmel,at91rm9200-pinctrl", "simple-mfd";
> + ranges = <0xfffff400 0xfffff400 0x600>;
> +
> + atmel,mux-mask = <
> + /* A B */
> + 0xffffffff 0xffc00c3b /* pioA */
> + 0xffffffff 0x7fff3ccf /* pioB */
> + 0xffffffff 0x007fffff /* pioC */
> + >;
> +
> + dbgu {
> + pinctrl_dbgu: dbgu-0 {
> + atmel,pins =
> + <AT91_PIOB 14 AT91_PERIPH_A AT91_PINCTRL_PULL_UP
> + AT91_PIOB 15 AT91_PERIPH_A AT91_PINCTRL_NONE>;
> + };
> + };
> +
> + pioA: gpio@...ff400 {
> + compatible = "atmel,at91rm9200-gpio";
> + reg = <0xfffff400 0x200>;
> + interrupts = <2 IRQ_TYPE_LEVEL_HIGH 1>;
> + #gpio-cells = <2>;
> + gpio-controller;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + clocks = <&pmc PMC_TYPE_PERIPHERAL 2>;
> + };
> + };
> +...
> --
> 2.25.1
>
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