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Message-ID: <4c92afa7-53e2-0243-e6b5-3e594cc6b2ca@canonical.com>
Date: Mon, 10 Jan 2022 16:52:02 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To: Rob Herring <robh@...nel.org>
Cc: Andi Shyti <andi@...zian.org>, Mark Brown <broonie@...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 04/01/2022 17:47, Rob Herring wrote:
> On Sun, Jan 02, 2022 at 04:58:07PM +0100, Krzysztof Kozlowski 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
>> + - 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:
>
> All this has to go in it's own schema which then needs to be added to
> spi-peripheral-props.yaml.
OK
>
>> + 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
>
> Not really great that this is required and there's not some default that
> works.
I can make it optional with new kernel. I'll send a follow up patch for
this.
>
>> +
>> + 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";
>
> Don't need 'status' in examples.
Sure
>
>> + 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 {
>
> The schema didn't get checked since spi-peripheral-props.yaml isn't
> yet in my tree, but I'd expect this to be a warning. If not its schema
> needs to be a bit stricter. The schema for "wlf,wm5110" will need to
> reference spi-peripheral-props.yaml. (Actually, all SPI peripheral
> device schemas will need a reference in theory, but really we only care
> for devices used with controllers with extra properties).
I did not see any warnings. I'll modify the wm5110.
Best regards,
Krzysztof
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