On Wed, 6 Mar 2024 at 17:52, Sriram Dash <quic_sriramd@xxxxxxxxxxx> wrote: > > On 3/6/2024 12:33 AM, Dmitry Baryshkov wrote: > > On Tue, 5 Mar 2024 at 18:58, Sriram Dash <quic_sriramd@xxxxxxxxxxx> wrote: > >> > >> Some target systems allow multiple resources to be managed by firmware. > >> On these targets, tasks related to clocks, regulators, resets, and > >> interconnects can be delegated to the firmware, while the remaining > >> responsibilities are handled by Linux. > >> > >> To support the management of partial resources in Linux and leave the rest > >> to firmware, multiple power domains are introduced. Each power domain can > >> manage one or more resources, depending on the specific use case. > >> > >> These power domains handle SCMI calls to the firmware, enabling the > >> activation and deactivation of firmware-managed resources. > >> > >> Signed-off-by: Sriram Dash <quic_sriramd@xxxxxxxxxxx> > >> --- > >> .../phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml | 74 ++++++++++++++++------ > >> .../bindings/phy/qcom,usb-snps-femto-v2.yaml | 49 ++++++++++++-- > >> .../devicetree/bindings/usb/qcom,dwc3.yaml | 37 ++++++++++- > >> 3 files changed, 130 insertions(+), 30 deletions(-) > >> > >> diff --git a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml > >> index 1e2d4dd..53b9ba9 100644 > >> --- a/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml > >> +++ b/Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb3-uni-phy.yaml > >> @@ -44,7 +44,32 @@ properties: > >> maxItems: 5 > >> > >> power-domains: > >> - maxItems: 1 > >> + description: specifies a phandle to PM domain provider node > >> + minItems: 1 > >> + maxItems: 2 > >> + > >> + power-domain-names: > >> + description: > >> + A list of power domain name strings sorted in the same order as the > >> + power-domains property. > >> + > >> + For platforms where some resource are firmware managed, the name > >> + corresponding to the index of an SCMI domain provider can be > >> + "usb_core" or "usb_transfer". > >> + items: > >> + - const: usb_core > >> + - const: usb_transfer > >> + > >> + qmp,fw-managed: > >> + description: > >> + Some targets allow multiple resources to be managed by firmware. > >> + On these targets, tasks related to clocks, regulators, resets, and > >> + interconnects can be delegated to the firmware, while the remaining > >> + responsibilities are handled by Linux. > >> + > >> + Decide if the target resources will be managed by firmware or High level > >> + OS. > >> + type: boolean > >> > >> resets: > >> maxItems: 2 > >> @@ -70,14 +95,6 @@ properties: > >> required: > >> - compatible > >> - reg > >> - - clocks > >> - - clock-names > >> - - resets > >> - - reset-names > >> - - vdda-phy-supply > >> - - vdda-pll-supply > >> - - "#clock-cells" > >> - - clock-output-names > >> - "#phy-cells" > >> > >> allOf: > >> @@ -86,6 +103,33 @@ allOf: > >> compatible: > >> contains: > >> enum: > >> + - qcom,sa8775p-qmp-usb3-uni-phy > >> + - qcom,sc8280xp-qmp-usb3-uni-phy > >> + - qcom,x1e80100-qmp-usb3-uni-phy > >> + then: > >> + required: > >> + - power-domains > >> + > >> + - if: > >> + not: > >> + required: > >> + - qmp,fw-managed > >> + then: > >> + required: > >> + - clocks > >> + - clock-names > >> + - resets > >> + - reset-names > >> + - vdda-phy-supply > >> + - vdda-pll-supply > >> + - clock-output-names > >> + - "#clock-cells" > >> + > >> + - if: > >> + properties: > >> + compatible: > >> + contains: > >> + enum: > >> - qcom,ipq6018-qmp-usb3-phy > >> - qcom,ipq8074-qmp-usb3-phy > >> - qcom,ipq9574-qmp-usb3-phy > >> @@ -144,18 +188,6 @@ allOf: > >> - const: com_aux > >> - const: pipe > >> > >> - - if: > >> - properties: > >> - compatible: > >> - contains: > >> - enum: > >> - - qcom,sa8775p-qmp-usb3-uni-phy > >> - - qcom,sc8280xp-qmp-usb3-uni-phy > >> - - qcom,x1e80100-qmp-usb3-uni-phy > >> - then: > >> - required: > >> - - power-domains > >> - > >> additionalProperties: false > >> > >> examples: > >> diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml > >> index 0f200e3..ad2f08f 100644 > >> --- a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml > >> +++ b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml > >> @@ -49,6 +49,34 @@ properties: > >> items: > >> - const: ref > >> > >> + power-domains: > >> + description: specifies a phandle to PM domain provider node > >> + minItems: 1 > >> + maxItems: 2 > >> + > >> + power-domain-names: > >> + description: > >> + A list of power domain name strings sorted in the same order as the > >> + power-domains property. > >> + > >> + For platforms where some resource are firmware managed, the name > >> + corresponding to the index of an SCMI domain provider can be > >> + "usb_core" or "usb_transfer". > >> + items: > >> + - const: usb_core > >> + - const: usb_transfer > >> + > >> + hsphy,fw-managed: > >> + description: > >> + Some targets allow multiple resources to be managed by firmware. > >> + On these targets, tasks related to clocks, regulators, resets, and > >> + interconnects can be delegated to the firmware, while the remaining > >> + responsibilities are handled by Linux. > >> + > >> + Decide if the target resources will be managed by firmware or High level > >> + OS. > >> + type: boolean > >> + > >> resets: > >> items: > >> - description: PHY core reset > >> @@ -154,12 +182,21 @@ required: > >> - compatible > >> - reg > >> - "#phy-cells" > >> - - clocks > >> - - clock-names > >> - - resets > >> - - vdda-pll-supply > >> - - vdda18-supply > >> - - vdda33-supply > >> + > >> + > >> +allOf: > >> + - if: > >> + not: > >> + required: > >> + - hsphy,fw-managed > >> + then: > >> + required: > >> + - clocks > >> + - clock-names > >> + - resets > >> + - vdda-pll-supply > >> + - vdda18-supply > >> + - vdda33-supply > >> > >> additionalProperties: false > >> > >> diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml > >> index 63d150b..5bf3a29 100644 > >> --- a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml > >> +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml > >> @@ -64,7 +64,31 @@ properties: > >> > >> power-domains: > >> description: specifies a phandle to PM domain provider node > >> - maxItems: 1 > >> + minItems: 1 > >> + maxItems: 2 > >> + > >> + power-domain-names: > >> + description: > >> + A list of power domain name strings sorted in the same order as the > >> + power-domains property. > >> + > >> + For platforms where some resource are firmware managed, the name > >> + corresponding to the index of an SCMI domain provider can be > >> + "usb_core" or "usb_transfer". > >> + items: > >> + - const: usb_core > >> + - const: usb_transfer > >> + > >> + qcom,fw-managed: > >> + description: > >> + Some targets allow multiple resources to be managed by firmware. > >> + On these targets, tasks related to clocks, regulators, resets, and > >> + interconnects can be delegated to the firmware, while the remaining > >> + responsibilities are handled by Linux. > >> + > >> + Decide if the target resources will be managed by firmware or High level > >> + OS. > >> + type: boolean > > > > I think this is an overkill. You know that SA8775 is going to use > > SCMI-based clocks / PD management. Thus I'd suggest adding new > > bindings file targeting qcom,sa8775-dwc3. Also you can drop the > > qcom,fw-managed property at all, let the driver decide basing on the > > compat string. > > > > > > Thank you for the suggestion Dmitry. I will include > new compat string for SA8775 which will decide whether > to use scmi based clock/ PD. As a reminder: - same hardware = same compatible string - existing DT better to continue to work. Or ask for explicit permission from Bjorn to break the ABI. > > >> > >> required-opps: > >> maxItems: 1 > >> @@ -148,13 +172,20 @@ required: > >> - "#address-cells" > >> - "#size-cells" > >> - ranges > >> - - clocks > >> - - clock-names > >> - interrupts > >> - interrupt-names > >> > >> allOf: > >> - if: > >> + not: > >> + required: > >> + - qcom,fw-managed > >> + then: > >> + required: > >> + - clocks > >> + - clock-names > >> + > >> + - if: > >> properties: > >> compatible: > >> contains: > >> -- > >> 2.7.4 > >> > >> > > > > > > -- > > With best wishes > > Dmitry -- With best wishes Dmitry
