linux-kernel - Re: [PATCH 1/4] dt-bindings: mfd: qcom,qca639x: add binding for QCA639x defvice

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Date:   Thu, 31 Dec 2020 15:50:07 -0700
From:   Rob Herring <robh@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lee Jones <lee.jones@...aro.org>,
        linux-arm-msm@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: mfd: qcom,qca639x: add binding for
 QCA639x defvice

On Sun, Dec 20, 2020 at 07:58:42PM +0300, Dmitry Baryshkov wrote:
> Qualcomm QCA639x is a family of WiFi + Bluetooth SoCs, with BT part
> being controlled through the UART and WiFi being present on PCIe bus.
> Both blocks share common power sources. Add binding to describe power
> sequencing required to power up this device.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  .../devicetree/bindings/mfd/qcom,qca639x.yaml | 84 +++++++++++++++++++
>  1 file changed, 84 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/qcom,qca639x.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/qcom,qca639x.yaml b/Documentation/devicetree/bindings/mfd/qcom,qca639x.yaml
> new file mode 100644
> index 000000000000..d43c75da136f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/qcom,qca639x.yaml
> @@ -0,0 +1,84 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/mfd/qcom,qca639x.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Qualcomm QCA639x WiFi + Bluetoot SoC bindings
> +
> +maintainers:
> +  - Andy Gross <agross@...nel.org>
> +  - Bjorn Andersson <bjorn.andersson@...aro.org>
> +
> +description: |
> +  This binding describes thes Qualcomm QCA6390 or QCA6391 power supplies and
> +  enablement pins.

Humm, this should really be for the whole device. For BT/WiFi chips 
we've gotten away with 2 nodes for each interface. If that doesn't work 
here, then I think this needs to be 1 node for all, not 3 as it seems 
you are doing.

> +
> +properties:
> +  compatible:
> +    const: qcom,qca639x

List each device, we don't do wildcards in compatible strings. 

> +
> +  '#power-domain-cells':
> +    const: 0
> +
> +  pinctrl-0: true
> +  pinctrl-1: true
> +
> +  pinctrl-names:
> +    items:
> +      - const: default
> +      - const: active
> +
> +  vddaon-supply:
> +    description:
> +      0.95V always-on LDO power input
> +
> +  vddpmu-supply:
> +    description:
> +      0.95V LDO power input to PMU
> +
> +  vddrfa1-supply:
> +    description:
> +      0.95V LDO power input to RFA
> +
> +  vddrfa2-supply:
> +    description:
> +      1.25V LDO power input to RFA
> +
> +  vddrfa3-supply:
> +    description:
> +      2V LDO power input to RFA
> +
> +  vddpcie1-supply:
> +    description:
> +      1.25V LDO power input to PCIe part
> +
> +  vddpcie2-supply:
> +    description:
> +      2V LDO power input to PCIe part

Do the PCIe supplies have to be on if only the BT part is used?

Supplies are refcounted, so I'd suggest just duplicating the supplies in 
both the BT and PCIe nodes.

> +
> +  vddio-supply:
> +    description:
> +      1.8V VIO input
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    qca639x: qca639x {
> +      compatible = "qcom,qca639x";
> +      #power-domain-cells = <0>;
> +
> +      vddaon-supply = <&vreg_s6a_0p95>;
> +      vddpmu-supply = <&vreg_s2f_0p95>;
> +      vddrfa1-supply = <&vreg_s2f_0p95>;
> +      vddrfa2-supply = <&vreg_s8c_1p3>;
> +      vddrfa3-supply = <&vreg_s5a_1p9>;
> +      vddpcie1-supply = <&vreg_s8c_1p3>;
> +      vddpcie2-supply = <&vreg_s5a_1p9>;
> +      vddio-supply = <&vreg_s4a_1p8>;
> +      pinctrl-names = "default", "active";
> +      pinctrl-0 = <&wlan_default_state &bt_default_state>;
> +      pinctrl-1 = <&wlan_active_state &bt_active_state>;
> +    };
> +...
> -- 
> 2.29.2
>