linux-kernel - Re: [PATCH v4 1/2] dt-bindings: pinctrl: qcom: Add sm8250 lpass lpi pinctrl bindings

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Message-ID: <X8WUi++JFLVvbXqj@builder.lan>
Date:   Mon, 30 Nov 2020 18:55:39 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org, agross@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: pinctrl: qcom: Add sm8250 lpass lpi
 pinctrl bindings

On Mon 16 Nov 08:34 CST 2020, Srinivas Kandagatla wrote:

> Add device tree binding Documentation details for Qualcomm SM8250
> LPASS(Low Power Audio Sub System) LPI(Low Power Island) pinctrl driver.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../pinctrl/qcom,lpass-lpi-pinctrl.yaml       | 132 ++++++++++++++++++
>  1 file changed, 132 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/qcom,lpass-lpi-pinctrl.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,lpass-lpi-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/qcom,lpass-lpi-pinctrl.yaml
> new file mode 100644
> index 000000000000..704e761146ef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/qcom,lpass-lpi-pinctrl.yaml
> @@ -0,0 +1,132 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/qcom,lpass-lpi-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. Low Power Audio SubSystem (LPASS)
> +  Low Power Island (LPI) TLMM block
> +
> +maintainers:
> +  - Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> +
> +description: |
> +  This binding describes the Top Level Mode Multiplexer block found in the
> +  LPASS LPI IP on most Qualcomm SoCs
> +
> +properties:
> +  compatible:
> +    const: qcom,sm8250-lpass-lpi-pinctrl
> +
> +  reg:
> +    minItems: 2
> +    maxItems: 2
> +
> +  clocks:
> +    items:
> +      - description: LPASS Core voting clock
> +      - description: LPASS Audio voting clock
> +
> +  clock-names:
> +    items:
> +      - const: core
> +      - const: audio
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    description: Specifying the pin number and flags, as defined in
> +      include/dt-bindings/gpio/gpio.h
> +    const: 2
> +
> +  gpio-ranges:
> +    maxItems: 1
> +
> +#PIN CONFIGURATION NODES
> +patternProperties:
> +  '-pins$':
> +    type: object
> +    description:
> +      Pinctrl node's client devices use subnodes for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +    $ref: "/schemas/pinctrl/pincfg-node.yaml"
> +
> +    properties:
> +      pins:
> +        description:
> +          List of gpio pins affected by the properties specified in this
> +          subnode.
> +        items:
> +          oneOf:
> +            - pattern: "^gpio([0-9]|[1-9][0-9])$"
> +        minItems: 1
> +        maxItems: 14
> +
> +      function:
> +        enum: [ gpio, swr_tx_clk, qua_mi2s_sclk, swr_tx_data1, qua_mi2s_ws,
> +                swr_tx_data2, qua_mi2s_data0, swr_rx_clk, qua_mi2s_data1,
> +                swr_rx_data1, qua_mi2s_data2, swr_tx_data3, swr_rx_data2,
> +                dmic1_clk, i2s1_clk, dmic1_data, i2s1_ws, dmic2_clk,
> +                i2s1_data0, dmic2_data, i2s1_data1, i2s2_clk, wsa_swr_clk,
> +                i2s2_ws, wsa_swr_data, dmic3_clk, i2s2_data0, dmic3_data,
> +                i2s2_data1 ]
> +        description:
> +          Specify the alternative function to be configured for the specified
> +          pins.
> +
> +      drive-strength:
> +        enum: [2, 4, 6, 8, 10, 12, 14, 16]
> +        default: 2
> +        description:
> +          Selects the drive strength for the specified pins, in mA.
> +
> +      slew-rate:
> +        enum: [0, 1, 2, 3]
> +        default: 0
> +        description: |
> +            0: No adjustments
> +            1: Higher Slew rate (faster edges)
> +            2: Lower Slew rate (slower edges)
> +            3: Reserved (No adjustments)
> +
> +      bias-pull-down: true
> +
> +      bias-pull-up: true
> +
> +      bias-disable: true
> +
> +      output-high: true
> +
> +      output-low: true
> +
> +    required:
> +      - pins
> +      - function
> +
> +    additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - gpio-controller
> +  - '#gpio-cells'
> +  - gpio-ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/sound/qcom,q6afe.h>
> +    lpi_tlmm: pinctrl@...0000 {
> +        compatible = "qcom,sm8250-lpass-lpi-pinctrl";
> +        reg = <0x33c0000 0x20000>,
> +              <0x355a000 0x1000>;

We shouldn't reference parts of blocks, so this should be 16KB at
0x35500000 and if we have multiple drivers that needs to poke in that
region we'd need to abstract that somehow (e.g. though a syscon).

Regards,
Bjorn

> +        clocks = <&q6afecc LPASS_HW_MACRO_VOTE LPASS_CLK_ATTRIBUTE_COUPLE_NO>,
> +                 <&q6afecc LPASS_HW_DCODEC_VOTE LPASS_CLK_ATTRIBUTE_COUPLE_NO>;
> +        clock-names = "core", "audio";
> +        gpio-controller;
> +        #gpio-cells = <2>;
> +        gpio-ranges = <&lpi_tlmm 0 0 14>;
> +    };
> -- 
> 2.21.0
>