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Date: Mon, 3 Jan 2022 16:41:37 +0200
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc: Andi Shyti <andi@...zian.org>, Mark Brown <broonie@...nel.org>,
Rob Herring <robh+dt@...nel.org>, linux-spi@...r.kernel.org,
linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] spi: dt-bindings: samsung: convert to dtschema
On Sun, 2 Jan 2022 at 17:58, Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> Convert the Samsung SoC (S3C24xx, S3C64xx, S5Pv210, Exynos) SPI
> controller bindings to DT schema format
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> ---
> .../devicetree/bindings/spi/samsung,spi.yaml | 220 ++++++++++++++++++
> .../devicetree/bindings/spi/spi-samsung.txt | 122 ----------
> MAINTAINERS | 2 +-
> 3 files changed, 221 insertions(+), 123 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/spi/samsung,spi.yaml
> delete mode 100644 Documentation/devicetree/bindings/spi/spi-samsung.txt
>
> diff --git a/Documentation/devicetree/bindings/spi/samsung,spi.yaml b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> new file mode 100644
> index 000000000000..195bfafe05fd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> @@ -0,0 +1,220 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/spi/samsung,spi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung S3C/S5P/Exynos SoC SPI controller
> +
> +maintainers:
> + - Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> +
> +description:
> + All the SPI controller nodes should be represented in the aliases node using
> + the following format 'spi{n}' where n is a unique number for the alias.
> +
> +properties:
> + compatible:
> + oneOf:
> + - enum:
> + - samsung,s3c2443-spi
Maybe add the list of supported platforms for each compatible (in a
comment on the same line), like it was done in .txt binding?
Other than that:
Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>
> + - samsung,s3c6410-spi
> + - samsung,s5pv210-spi
> + - samsung,exynos5433-spi
> + - const: samsung,exynos7-spi
> + deprecated: true
> +
> + clocks:
> + minItems: 2
> + maxItems: 3
> +
> + clock-names:
> + minItems: 2
> + maxItems: 3
> +
> + cs-gpios: true
> +
> + dmas:
> + minItems: 2
> + maxItems: 2
> +
> + dma-names:
> + items:
> + - const: tx
> + - const: rx
> +
> + interrupts:
> + maxItems: 1
> +
> + no-cs-readback:
> + description:
> + The CS line is disconnected, therefore the device should not operate
> + based on CS signalling.
> + type: boolean
> +
> + num-cs:
> + minimum: 1
> + maximum: 4
> + default: 1
> +
> + samsung,spi-src-clk:
> + description:
> + If the spi controller includes a internal clock mux to select the clock
> + source for the spi bus clock, this property can be used to indicate the
> + clock to be used for driving the spi bus clock. If not specified, the
> + clock number 0 is used as default.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + default: 0
> +
> + reg:
> + maxItems: 1
> +
> +patternProperties:
> + "^.*@[0-9a-f]+$":
> + type: object
> +
> + allOf:
> + - $ref: spi-peripheral-props.yaml
> +
> + properties:
> + controller-data:
> + type: object
> + additionalProperties: false
> +
> + properties:
> + samsung,spi-feedback-delay:
> + description: |
> + The sampling phase shift to be applied on the miso line (to account
> + for any lag in the miso line). Valid values:
> + - 0: No phase shift.
> + - 1: 90 degree phase shift sampling.
> + - 2: 180 degree phase shift sampling.
> + - 3: 270 degree phase shift sampling.
> + $ref: /schemas/types.yaml#/definitions/uint32
> + enum: [0, 1, 2, 3]
> +
> + required:
> + - samsung,spi-feedback-delay
> +
> + required:
> + - controller-data
> +
> + unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - clocks
> + - clock-names
> + - dmas
> + - dma-names
> + - interrupts
> + - reg
> +
> +allOf:
> + - $ref: spi-controller.yaml#
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: samsung,exynos5433-spi
> + then:
> + properties:
> + clocks:
> + minItems: 3
> + maxItems: 3
> + clock-names:
> + items:
> + - const: spi
> + - enum:
> + - spi_busclk0
> + - spi_busclk1
> + - spi_busclk2
> + - spi_busclk3
> + - const: spi_ioclk
> + else:
> + properties:
> + clocks:
> + minItems: 2
> + maxItems: 2
> + clock-names:
> + items:
> + - const: spi
> + - enum:
> + - spi_busclk0
> + - spi_busclk1
> + - spi_busclk2
> + - spi_busclk3
> +
> +unevaluatedProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/exynos5433.h>
> + #include <dt-bindings/clock/samsung,s2mps11.h>
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/gpio/gpio.h>
> +
> + spi@...30000 {
> + compatible = "samsung,exynos5433-spi";
> + reg = <0x14d30000 0x100>;
> + interrupts = <GIC_SPI 433 IRQ_TYPE_LEVEL_HIGH>;
> + dmas = <&pdma0 11>, <&pdma0 10>;
> + dma-names = "tx", "rx";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + clocks = <&cmu_peric CLK_PCLK_SPI1>,
> + <&cmu_peric CLK_SCLK_SPI1>,
> + <&cmu_peric CLK_SCLK_IOCLK_SPI1>;
> + clock-names = "spi",
> + "spi_busclk0",
> + "spi_ioclk";
> + samsung,spi-src-clk = <0>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&spi1_bus>;
> + num-cs = <1>;
> +
> + cs-gpios = <&gpd6 3 GPIO_ACTIVE_HIGH>;
> + status = "okay";
> +
> + audio-codec@0 {
> + compatible = "wlf,wm5110";
> + reg = <0x0>;
> + spi-max-frequency = <20000000>;
> + interrupt-parent = <&gpa0>;
> + interrupts = <4 IRQ_TYPE_NONE>;
> + clocks = <&pmu_system_controller 0>,
> + <&s2mps13_osc S2MPS11_CLK_BT>;
> + clock-names = "mclk1", "mclk2";
> +
> + gpio-controller;
> + #gpio-cells = <2>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> +
> + wlf,micd-detect-debounce = <300>;
> + wlf,micd-bias-start-time = <0x1>;
> + wlf,micd-rate = <0x7>;
> + wlf,micd-dbtime = <0x2>;
> + wlf,micd-force-micbias;
> + wlf,micd-configs = <0x0 1 0>;
> + wlf,hpdet-channel = <1>;
> + wlf,gpsw = <0x1>;
> + wlf,inmode = <2 0 2 0>;
> +
> + wlf,reset = <&gpc0 7 GPIO_ACTIVE_HIGH>;
> + wlf,ldoena = <&gpf0 0 GPIO_ACTIVE_HIGH>;
> +
> + /* core supplies */
> + AVDD-supply = <&ldo18_reg>;
> + DBVDD1-supply = <&ldo18_reg>;
> + CPVDD-supply = <&ldo18_reg>;
> + DBVDD2-supply = <&ldo18_reg>;
> + DBVDD3-supply = <&ldo18_reg>;
> + SPKVDDL-supply = <&ldo18_reg>;
> + SPKVDDR-supply = <&ldo18_reg>;
> +
> + controller-data {
> + samsung,spi-feedback-delay = <0>;
> + };
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/spi/spi-samsung.txt b/Documentation/devicetree/bindings/spi/spi-samsung.txt
> deleted file mode 100644
> index 49028a4f5df1..000000000000
> --- a/Documentation/devicetree/bindings/spi/spi-samsung.txt
> +++ /dev/null
> @@ -1,122 +0,0 @@
> -* Samsung SPI Controller
> -
> -The Samsung SPI controller is used to interface with various devices such as flash
> -and display controllers using the SPI communication interface.
> -
> -Required SoC Specific Properties:
> -
> -- compatible: should be one of the following.
> - - samsung,s3c2443-spi: for s3c2443, s3c2416 and s3c2450 platforms
> - - samsung,s3c6410-spi: for s3c6410 platforms
> - - samsung,s5pv210-spi: for s5pv210 and s5pc110 platforms
> - - samsung,exynos5433-spi: for exynos5433 compatible controllers
> - - samsung,exynos7-spi: for exynos7 platforms <DEPRECATED>
> -
> -- reg: physical base address of the controller and length of memory mapped
> - region.
> -
> -- interrupts: The interrupt number to the cpu. The interrupt specifier format
> - depends on the interrupt controller.
> -
> -- dmas : Two or more DMA channel specifiers following the convention outlined
> - in bindings/dma/dma.txt
> -
> -- dma-names: Names for the dma channels. There must be at least one channel
> - named "tx" for transmit and named "rx" for receive.
> -
> -- clocks: specifies the clock IDs provided to the SPI controller; they are
> - required for interacting with the controller itself, for synchronizing the bus
> - and as I/O clock (the latter is required by exynos5433 and exynos7).
> -
> -- clock-names: string names of the clocks in the 'clocks' property; for all the
> - the devices the names must be "spi", "spi_busclkN" (where N is determined by
> - "samsung,spi-src-clk"), while Exynos5433 should specify a third clock
> - "spi_ioclk" for the I/O clock.
> -
> -Required Board Specific Properties:
> -
> -- #address-cells: should be 1.
> -- #size-cells: should be 0.
> -
> -Optional Board Specific Properties:
> -
> -- samsung,spi-src-clk: If the spi controller includes a internal clock mux to
> - select the clock source for the spi bus clock, this property can be used to
> - indicate the clock to be used for driving the spi bus clock. If not specified,
> - the clock number 0 is used as default.
> -
> -- num-cs: Specifies the number of chip select lines supported. If
> - not specified, the default number of chip select lines is set to 1.
> -
> -- cs-gpios: should specify GPIOs used for chipselects (see spi-bus.txt)
> -
> -- no-cs-readback: the CS line is disconnected, therefore the device should not
> - operate based on CS signalling.
> -
> -SPI Controller specific data in SPI slave nodes:
> -
> -- The spi slave nodes should provide the following information which is required
> - by the spi controller.
> -
> - - samsung,spi-feedback-delay: The sampling phase shift to be applied on the
> - miso line (to account for any lag in the miso line). The following are the
> - valid values.
> -
> - - 0: No phase shift.
> - - 1: 90 degree phase shift sampling.
> - - 2: 180 degree phase shift sampling.
> - - 3: 270 degree phase shift sampling.
> -
> -Aliases:
> -
> -- All the SPI controller nodes should be represented in the aliases node using
> - the following format 'spi{n}' where n is a unique number for the alias.
> -
> -
> -Example:
> -
> -- SoC Specific Portion:
> -
> - spi_0: spi@...20000 {
> - compatible = "samsung,exynos4210-spi";
> - reg = <0x12d20000 0x100>;
> - interrupts = <0 66 0>;
> - dmas = <&pdma0 5
> - &pdma0 4>;
> - dma-names = "tx", "rx";
> - #address-cells = <1>;
> - #size-cells = <0>;
> - };
> -
> -- Board Specific Portion:
> -
> - spi_0: spi@...20000 {
> - #address-cells = <1>;
> - #size-cells = <0>;
> - pinctrl-names = "default";
> - pinctrl-0 = <&spi0_bus>;
> - cs-gpios = <&gpa2 5 0>;
> -
> - w25q80bw@0 {
> - #address-cells = <1>;
> - #size-cells = <1>;
> - compatible = "w25x80";
> - reg = <0>;
> - spi-max-frequency = <10000>;
> -
> - controller-data {
> - samsung,spi-feedback-delay = <0>;
> - };
> -
> - partition@0 {
> - label = "U-Boot";
> - reg = <0x0 0x40000>;
> - read-only;
> - };
> -
> - partition@...00 {
> - label = "Kernel";
> - reg = <0x40000 0xc0000>;
> - };
> - };
> - };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index af392bd04874..572eb97f1855 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -17058,7 +17058,7 @@ M: Andi Shyti <andi@...zian.org>
> L: linux-spi@...r.kernel.org
> L: linux-samsung-soc@...r.kernel.org
> S: Maintained
> -F: Documentation/devicetree/bindings/spi/spi-samsung.txt
> +F: Documentation/devicetree/bindings/spi/samsung,spi.yaml
> F: drivers/spi/spi-s3c*
> F: include/linux/platform_data/spi-s3c64xx.h
> F: include/linux/spi/s3c24xx-fiq.h
> --
> 2.32.0
>
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