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Date: Wed, 19 May 2021 18:53:21 +0200
From: Sander Vanheule <sander@...nheule.net>
To: Rob Herring <robh@...nel.org>
Cc: Pavel Machek <pavel@....cz>, Lee Jones <lee.jones@...aro.org>,
Linus Walleij <linus.walleij@...aro.org>,
linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: mfd: Binding for RTL8231
On Mon, 2021-05-17 at 17:38 -0500, Rob Herring wrote:
> On Tue, May 11, 2021 at 02:25:20PM +0200, Sander Vanheule wrote:
> > Add a binding description for the Realtek RTL8231, a GPIO and LED
> > expander chip commonly used in ethernet switches based on a Realtek
> > switch SoC. These chips can be addressed via an MDIO or SMI bus, or used
> > as a plain 36-bit shift register.
> >
> > This binding only describes the feature set provided by the MDIO/SMI
> > configuration, and covers the GPIO, PWM, and pin control properties. The
> > LED properties are defined in a separate binding.
> >
> > Signed-off-by: Sander Vanheule <sander@...nheule.net>
> > ---
> > .../bindings/mfd/realtek,rtl8231.yaml | 202 ++++++++++++++++++
> > 1 file changed, 202 insertions(+)
> > create mode 100644
> > Documentation/devicetree/bindings/mfd/realtek,rtl8231.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/realtek,rtl8231.yaml
> > b/Documentation/devicetree/bindings/mfd/realtek,rtl8231.yaml
> > new file mode 100644
> > index 000000000000..2023cfa887a3
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/realtek,rtl8231.yaml
> > @@ -0,0 +1,202 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mfd/realtek,rtl8231.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Realtek RTL8231 GPIO and LED expander.
> > +
> > +maintainers:
> > + - Sander Vanheule <sander@...nheule.net>
> > +
> > +description: |
> > + The RTL8231 is a GPIO and LED expander chip, providing up to 37 GPIOs, up
> > to
> > + 88 LEDs, and up to one PWM output. This device is frequently used
> > alongside
> > + Realtek switch SoCs, to provide additional I/O capabilities.
> > +
> > + To manage the RTL8231's features, its strapping pins can be used to
> > configure
> > + it in one of three modes: shift register, MDIO device, or SMI device. The
> > + shift register mode does not need special support. In MDIO or SMI mode,
> > most
> > + pins can be configured as a GPIO output, LED matrix scan line/column, or
> > as a
> > + PWM output.
> > +
> > + The GPIO and pin control are part of the main node. PWM and LED support
> > are
> > + configured as sub-nodes.
> > +
> > +properties:
> > + compatible:
> > + const: realtek,rtl8231
> > +
> > + reg:
> > + description: MDIO or SMI device address.
> > + maxItems: 1
> > +
> > + # GPIO support
> > + gpio-controller: true
> > +
> > + "#gpio-cells":
> > + const: 2
> > + description: |
> > + The first cell is the pin number and the second cell is used to
> > specify
> > + the gpio active state.
> > +
> > + gpio-ranges:
> > + description: |
> > + Must reference itself, and provide a zero-based mapping for 37 pins.
> > + maxItems: 1
> > +
> > + # Pin muxing and configuration
> > + realtek,drive-strength:
> > + $ref: /schemas/types.yaml#/definitions/uint32
>
> Use the standard 'drive-strength' property.
Ok, I wasn't sure I could do this, since it's normally used in a pin config, not
a pin controller config. I'll update this, as well as the suggested changes
below.
Best,
Sander
>
> > + description: |
> > + Common drive strength used for all GPIO output pins, must be 4mA or
> > 8mA.
> > + On reset, this value will default to 8mA.
> > + enum: [4, 8]
> > +
> > + # LED scanning matrix
> > + leds:
> > + $ref: ../leds/realtek,rtl8231-leds.yaml#
> > +
> > + # PWM output
> > + pwm:
> > + type: object
> > + description: |
> > + Subnode describing the PWM peripheral. To use the PWM output, gpio35
> > must
> > + be muxed to its 'pwm' function. Valid frequency values for consumers
> > are
> > + 1200, 1600, 2000, 2400, 2800, 3200, 4000, and 4800.
> > +
> > + properties:
> > + "#pwm-cells":
> > + description: |
> > + Twos cells with PWM index (must be 0) and PWM frequency in Hz.
> > + const: 2
> > +
> > + required:
> > + - "#pwm-cells"
>
> Just move this to the parent node. No reason for a child node or that 1
> node can't be 2 providers.
>
> > +
> > +patternProperties:
> > + "-pins$":
> > + type: object
> > + $ref: ../pinctrl/pinmux-node.yaml#
> > +
> > + properties:
> > + pins:
> > + items:
> > + oneOf:
>
> No need for oneOf when there's only 1 entry.
>
> > + - enum: ["gpio0", "gpio1", "gpio2", "gpio3", "gpio4", "gpio5",
> > "gpio6",
> > + "gpio7", "gpio8", "gpio9", "gpio10", "gpio11",
> > "gpio12", "gpio13",
> > + "gpio14", "gpio15", "gpio16", "gpio17", "gpio18",
> > "gpio19", "gpio20",
> > + "gpio21", "gpio22", "gpio23", "gpio24", "gpio25",
> > "gpio26", "gpio27",
> > + "gpio28", "gpio29", "gpio30", "gpio31", "gpio32",
> > "gpio33", "gpio34",
> > + "gpio35", "gpio36"]
> > + minItems: 1
> > + maxItems: 37
> > + function:
> > + description: |
> > + Select which function to use. "gpio" is supported for all pins,
> > "led" is supported
> > + for pins 0-34, "pwm" is supported for for pin 35.
> > + enum: ["gpio", "led", "pwm"]
> > +
> > + required:
> > + - pins
> > + - function
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - gpio-controller
> > + - "#gpio-cells"
> > + - gpio-ranges
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + // Minimal example
> > + mdio {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + expander0: expander@0 {
> > + compatible = "realtek,rtl8231";
> > + reg = <0>;
> > +
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > + gpio-ranges = <&expander0 0 0 37>;
> > + };
> > + };
> > + - |
> > + // All bells and whistles included
> > + #include <dt-bindings/leds/common.h>
> > + mdio {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + expander1: expander@1 {
> > + compatible = "realtek,rtl8231";
> > + reg = <1>;
> > +
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > + gpio-ranges = <&expander1 0 0 37>;
> > +
> > + realtek,drive-strength = <4>;
> > +
> > + button-pins {
> > + pins = "gpio36";
> > + function = "gpio";
> > + input-debounce = "100000";
> > + };
> > +
> > + pwm-pins {
> > + pins = "gpio35";
> > + function = "pwm";
> > + };
> > +
> > + led-pins {
> > + pins = "gpio0", "gpio1", "gpio3", "gpio4";
> > + function = "led";
> > + };
> > +
> > + pwm {
> > + #pwm-cells = <2>;
> > + };
> > +
> > + leds {
> > + compatible = "realtek,rtl8231-leds";
> > + #address-cells = <2>;
> > + #size-cells = <0>;
> > +
> > + realtek,led-scan-mode = "single-color";
> > +
> > + led@0,0 {
> > + reg = <0 0>;
> > + color = <LED_COLOR_ID_GREEN>;
> > + function = LED_FUNCTION_LAN;
> > + function-enumerator = <0>;
> > + };
> > +
> > + led@0,1 {
> > + reg = <0 1>;
> > + color = <LED_COLOR_ID_AMBER>;
> > + function = LED_FUNCTION_LAN;
> > + function-enumerator = <0>;
> > + };
> > +
> > + led@1,0 {
> > + reg = <1 0>;
> > + color = <LED_COLOR_ID_GREEN>;
> > + function = LED_FUNCTION_LAN;
> > + function-enumerator = <1>;
> > + };
> > +
> > + led@1,1 {
> > + reg = <1 1>;
> > + color = <LED_COLOR_ID_AMBER>;
> > + function = LED_FUNCTION_LAN;
> > + function-enumerator = <1>;
> > + };
> > + };
> > + };
> > + };
> > --
> > 2.31.1
> >
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