Re: [PATCH v4] dt-bindings: sound: Convert Samsung I2S controller to dt-schema

[Krzysztof Kozlowski]

On Tue, Sep 24, 2019 at 01:55:53PM +0200, Marek Szyprowski wrote:
> From: Maciej Falkowski <m.falkowski@xxxxxxxxxxx>
> 
> Convert Samsung I2S controller to newer dt-schema format.
> 
> Signed-off-by: Maciej Falkowski <m.falkowski@xxxxxxxxxxx>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
> v4:
> - Removed description of i2s device nodes' clocks from
> 'clocks' property.
> - Added 'clock-output-names' property.
> - Added description of clock names.
> - Added '#clock-cells' property to required properties
> - Description of the provided clocks moved to samsung-i2s.h
> in separate patch
> 
> Best regards,
> Maciej Falkowski
> ---
>  .../devicetree/bindings/sound/samsung-i2s.txt |  84 -----------
>  .../bindings/sound/samsung-i2s.yaml           | 136 ++++++++++++++++++
>  2 files changed, 136 insertions(+), 84 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/sound/samsung-i2s.txt
>  create mode 100644 Documentation/devicetree/bindings/sound/samsung-i2s.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/samsung-i2s.txt b/Documentation/devicetree/bindings/sound/samsung-i2s.txt
> deleted file mode 100644
> index a88cb00fa096..000000000000
> --- a/Documentation/devicetree/bindings/sound/samsung-i2s.txt
> +++ /dev/null
> @@ -1,84 +0,0 @@
> -* Samsung I2S controller
> -
> -Required SoC Specific Properties:
> -
> -- compatible : should be one of the following.
> -   - samsung,s3c6410-i2s: for 8/16/24bit stereo I2S.
> -   - samsung,s5pv210-i2s: for 8/16/24bit multichannel(5.1) I2S with
> -     secondary fifo, s/w reset control and internal mux for root clk src.
> -   - samsung,exynos5420-i2s: for 8/16/24bit multichannel(5.1) I2S for
> -     playback, stereo channel capture, secondary fifo using internal
> -     or external dma, s/w reset control, internal mux for root clk src
> -     and 7.1 channel TDM support for playback. TDM (Time division multiplexing)
> -     is to allow transfer of multiple channel audio data on single data line.
> -   - samsung,exynos7-i2s: with all the available features of exynos5 i2s,
> -     exynos7 I2S has 7.1 channel TDM support for capture, secondary fifo
> -     with only external dma and more no.of root clk sampling frequencies.
> -   - samsung,exynos7-i2s1: I2S1 on previous samsung platforms supports
> -     stereo channels. exynos7 i2s1 upgraded to 5.1 multichannel with
> -     slightly modified bit offsets.
> -
> -- reg: physical base address of the controller and length of memory mapped
> -  region.
> -- dmas: list of DMA controller phandle and DMA request line ordered pairs.
> -- dma-names: identifier string for each DMA request line in the dmas property.
> -  These strings correspond 1:1 with the ordered pairs in dmas.
> -- clocks: Handle to iis clock and RCLK source clk.
> -- clock-names:
> -  i2s0 uses some base clocks from CMU and some are from audio subsystem internal
> -  clock controller. The clock names for i2s0 should be "iis", "i2s_opclk0" and
> -  "i2s_opclk1" as shown in the example below.
> -  i2s1 and i2s2 uses clocks from CMU. The clock names for i2s1 and i2s2 should
> -  be "iis" and "i2s_opclk0".
> -  "iis" is the i2s bus clock and i2s_opclk0, i2s_opclk1 are sources of the root
> -  clk. i2s0 has internal mux to select the source of root clk and i2s1 and i2s2
> -  doesn't have any such mux.
> -- #clock-cells: should be 1, this property must be present if the I2S device
> -  is a clock provider in terms of the common clock bindings, described in
> -  ../clock/clock-bindings.txt.
> -- clock-output-names (deprecated): from the common clock bindings, names of
> -  the CDCLK I2S output clocks, suggested values are "i2s_cdclk0", "i2s_cdclk1",
> -  "i2s_cdclk3" for the I2S0, I2S1, I2S2 devices respectively.
> -
> -There are following clocks available at the I2S device nodes:
> - CLK_I2S_CDCLK    - the CDCLK (CODECLKO) gate clock,
> - CLK_I2S_RCLK_PSR - the RCLK prescaler divider clock (corresponding to the
> -		    IISPSR register),
> - CLK_I2S_RCLK_SRC - the RCLKSRC mux clock (corresponding to RCLKSRC bit in
> -		    IISMOD register).
> -
> -Refer to the SoC datasheet for availability of the above clocks.
> -The CLK_I2S_RCLK_PSR and CLK_I2S_RCLK_SRC clocks are usually only available
> -in the IIS Multi Audio Interface.
> -
> -Note: Old DTs may not have the #clock-cells property and then not use the I2S
> -node as a clock supplier.
> -
> -Optional SoC Specific Properties:
> -
> -- samsung,idma-addr: Internal DMA register base address of the audio
> -  sub system(used in secondary sound source).
> -- pinctrl-0: Should specify pin control groups used for this controller.
> -- pinctrl-names: Should contain only one value - "default".
> -- #sound-dai-cells: should be 1.
> -
> -
> -Example:
> -
> -i2s0: i2s@3830000 {
> -	compatible = "samsung,s5pv210-i2s";
> -	reg = <0x03830000 0x100>;
> -	dmas = <&pdma0 10
> -		&pdma0 9
> -		&pdma0 8>;
> -	dma-names = "tx", "rx", "tx-sec";
> -	clocks = <&clock_audss EXYNOS_I2S_BUS>,
> -		<&clock_audss EXYNOS_I2S_BUS>,
> -		<&clock_audss EXYNOS_SCLK_I2S>;
> -	clock-names = "iis", "i2s_opclk0", "i2s_opclk1";
> -	#clock-cells = <1>;
> -	samsung,idma-addr = <0x03000000>;
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&i2s0_bus>;
> -	#sound-dai-cells = <1>;
> -};
> diff --git a/Documentation/devicetree/bindings/sound/samsung-i2s.yaml b/Documentation/devicetree/bindings/sound/samsung-i2s.yaml
> new file mode 100644
> index 000000000000..7d2750c26f11
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/samsung-i2s.yaml
> @@ -0,0 +1,136 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/samsung-i2s.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung SoC I2S controller
> +
> +maintainers:
> +  - Krzysztof Kozlowski <krzk@xxxxxxxxxx>
> +  - Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
> +
> +properties:
> +  compatible:
> +    description: |
> +      samsung,s3c6410-i2s: for 8/16/24bit stereo I2S.
> +
> +      samsung,s5pv210-i2s: for 8/16/24bit multichannel(5.1) I2S with
> +      secondary fifo, s/w reset control and internal mux for root clk src.
> +
> +      samsung,exynos5420-i2s: for 8/16/24bit multichannel(5.1) I2S for
> +      playback, stereo channel capture, secondary fifo using internal
> +      or external dma, s/w reset control, internal mux for root clk src
> +      and 7.1 channel TDM support for playback. TDM (Time division multiplexing)
> +      is to allow transfer of multiple channel audio data on single data line.
> +
> +      samsung,exynos7-i2s: with all the available features of exynos5 i2s.
> +      exynos7 I2S has 7.1 channel TDM support for capture, secondary fifo
> +      with only external dma and more no.of root clk sampling frequencies.
> +
> +      samsung,exynos7-i2s1: I2S1 on previous samsung platforms supports
> +      stereo channels. exynos7 i2s1 upgraded to 5.1 multichannel with
> +      slightly modified bit offsets.
> +    enum:
> +      - samsung,s3c6410-i2s
> +      - samsung,s5pv210-i2s
> +      - samsung,exynos5420-i2s
> +      - samsung,exynos7-i2s
> +      - samsung,exynos7-i2s1
> +
> +  reg:
> +    maxItems: 1
> +
> +  dmas:
> +    minItems: 2
> +    maxItems: 3
> +
> +  dma-names:
> +    oneOf:
> +      - items:
> +          - const: tx
> +          - const: rx
> +      - items:
> +          - const: tx
> +          - const: rx
> +          - const: tx-sec
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 3
> +
> +  clock-names:
> +    oneOf:
> +      - items:
> +          - const: iis
> +      - items: # for i2s0
> +          - const: iis
> +          - const: i2s_opclk0
> +          - const: i2s_opclk1
> +      - items: # for i2s1 and i2s2
> +          - const: iis
> +          - const: i2s_opclk0
> +    description: |
> +      "iis" is the i2s bus clock and i2s_opclk0, i2s_opclk1 are sources
> +      of the root clk. i2s0 has internal mux to select the source
> +      of root clk and i2s1 and i2s2 doesn't have any such mux.
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  clock-output-names: # deprecated

Instead:
  deprecated: true

> +    oneOf:
> +      - items: # for i2s0
> +          - const: i2s_cdclk0
> +      - items: # for i2s1
> +          - const: i2s_cdclk1
> +      - items: # for i2s2
> +          - const: i2s_cdclk2
> +    description: Names of the CDCLK I2S output clocks.
> +
> +  samsung,idma-addr:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Internal DMA register base address of the audio
> +      sub system(used in secondary sound source).
> +
> +  pinctrl-0:
> +    description: Should specify pin control groups used for this controller.
> +
> +  pinctrl-names:
> +    const: default
> +
> +  "#sound-dai-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - dmas
> +  - dma-names
> +  - clocks
> +  - clock-names
> +  - "#clock-cells"

Before, this was not a required property, except when registering a
clock provider. Are you 100% sure it we need to register clock provider
on every SoC?

For example, Exynos3250 does not do it... others also might.

Best regards,
Krzysztof


> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/exynos-audss-clk.h>
> +
> +    i2s0: i2s@3830000 {
> +        compatible = "samsung,s5pv210-i2s";
> +        reg = <0x03830000 0x100>;
> +        dmas = <&pdma0 10>,
> +                <&pdma0 9>,
> +                <&pdma0 8>;
> +        dma-names = "tx", "rx", "tx-sec";
> +        clocks = <&clock_audss EXYNOS_I2S_BUS>,
> +                <&clock_audss EXYNOS_I2S_BUS>,
> +                <&clock_audss EXYNOS_SCLK_I2S>;
> +        clock-names = "iis", "i2s_opclk0", "i2s_opclk1";
> +        #clock-cells = <1>;
> +        samsung,idma-addr = <0x03000000>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&i2s0_bus>;
> +        #sound-dai-cells = <1>;
> +    };
> +
> -- 
> 2.17.1
> 
> 
>