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Date: Tue, 2 Jul 2024 04:54:40 +0000
From: <Manikandan.M@...rochip.com>
To: <robh@...nel.org>
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
Hi Rob,
On 01/07/24 8:33 pm, Rob Herring wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> 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:
>> + $ref: /schemas/types.yaml#/definitions/uint32-matrix
>
> Is there no constraint on the dimensions? Always sets of 2 or 3 entries?
>
> Maybe better to not specify because the tools have some issues if the
> dimensions are variable.
>
Yes the mux values are either set of 2 or 3 based on the SoC variants.
Let me what should be omitted here to avoid issues from tools.
>> + description: |
>> + Array of mask (periph per bank) to describe if a pin can be
>> + configured in this periph mode. All the periph and bank need to
>> + be described.
>> +
>> + #How to create such array:
>> +
>> + Each column will represent the possible peripheral of the pinctrl
>> + Each line will represent a pio bank
>> +
>> + #Example:
>> +
>> + In at91sam9260.dtsi,
>> + Peripheral: 2 ( A and B)
>> + Bank: 3 (A, B and C)
>> +
>> + # A B
>> + 0xffffffff 0xffc00c3b # pioA
>> + 0xffffffff 0x7fff3ccf # pioB
>> + 0xffffffff 0x007fffff # pioC
>> +
>> + For each peripheral/bank we will describe in a u32 if a pin can be
>> + configured in it by putting 1 to the pin bit (1 << pin)
>> +
>> + Let's take the pioA on peripheral B whose value is 0xffc00c3b
>> + From the datasheet Table 10-2.
>> + Peripheral B
>> + PA0 MCDB0
>> + PA1 MCCDB
>> + PA2
>> + PA3 MCDB3
>> + PA4 MCDB2
>> + PA5 MCDB1
>> + PA6
>> + PA7
>> + PA8
>> + PA9
>> + PA10 ETX2
>> + PA11 ETX3
>> + PA12
>> + PA13
>> + PA14
>> + PA15
>> + PA16
>> + PA17
>> + PA18
>> + PA19
>> + PA20
>> + PA21
>> + PA22 ETXER
>> + PA23 ETX2
>> + PA24 ETX3
>> + PA25 ERX2
>> + PA26 ERX3
>> + PA27 ERXCK
>> + PA28 ECRS
>> + PA29 ECOL
>> + PA30 RXD4
>> + PA31 TXD4
>> +
>> +patternProperties:
>> + '^[a-z0-9-_]+$':
>> + 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
>>
--
Thanks and Regards,
Manikandan M.
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