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SubjectRe: [PATCH v2 3/4] dt-bindings: phy: Add support for QMP phy
On 11/22, Vivek Gautam wrote:
> Qualcomm chipsets have QMP phy controller that provides
> support to a number of controller, viz. PCIe, UFS, and USB.
> Adding dt binding information for the same.
>
> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
> Acked-by: Rob Herring <robh@kernel.org>
> ---
>
> Changes since v1:
> - New patch, forked out of the original driver patch:
> "phy: qcom-qmp: new qmp phy driver for qcom-chipsets"
> - updated bindings to include mem resource as a list of
> offset - length pair for serdes block and for each lane.
> - added a new binding for 'lane-offsets' that contains offsets
> to tx, rx and pcs blocks from each lane base address.
>
> .../devicetree/bindings/phy/qcom-qmp-phy.txt | 74 ++++++++++++++++++++++
> 1 file changed, 74 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
>
> diff --git a/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
> new file mode 100644
> index 0000000..ffb173b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt
> @@ -0,0 +1,74 @@
> +Qualcomm QMP PHY
> +----------------
> +
> +QMP phy controller supports physical layer functionality for a number of
> +controllers on Qualcomm chipsets, such as, PCIe, UFS, and USB.
> +
> +Required properties:
> + - compatible: compatible list, contains:
> + "qcom,msm8996-qmp-pcie-phy" for 14nm PCIe phy on msm8996,
> + "qcom,msm8996-qmp-usb3-phy" for 14nm USB3 phy on msm8996.
> + - reg: list of offset and length pair of the PHY register sets.
> + at index 0: offset and length of register set for PHY common
> + serdes block.
> + from index 1 - N: offset and length of register set for each lane,
> + for N number of phy lanes (ports).
> + - lane-offsets: array of offsets to tx, rx and pcs blocks for phy lanes.
> + - #phy-cells: must be 1
> + - Cell after phy phandle should be the port (lane) number.
> + - clocks: a list of phandles and clock-specifier pairs,
> + one for each entry in clock-names.
> + - clock-names: must be "cfg_ahb" for phy config clock,
> + "aux" for phy aux clock,
> + "ref_clk" for 19.2 MHz ref clk,
> + "ref_clk_src" for reference clock source,
> + "pipe<port-number>" for pipe clock specific to
> + each port/lane (Optional).
> + - resets: a list of phandles and reset controller specifier pairs,
> + one for each entry in reset-names.
> + - reset-names: must be "phy" for reset of phy block,
> + "common" for phy common block reset,
> + "cfg" for phy's ahb cfg block reset (Optional).
> + "port<port-number>" for reset specific to
> + each port/lane (Optional).
> + - vdda-phy-supply: Phandle to a regulator supply to PHY core block.
> + - vdda-pll-supply: Phandle to 1.8V regulator supply to PHY refclk pll block.
> +
> +Optional properties:
> + - vddp-ref-clk-supply: Phandle to a regulator supply to any specific refclk
> + pll block.
> +
> +Example:
> + pcie_phy: pciephy@34000 {
> + compatible = "qcom,msm8996-qmp-pcie-phy";
> + reg = <0x034000 0x48f>,
> + <0x035000 0x5bf>,
> + <0x036000 0x5bf>,
> + <0x037000 0x5bf>;
> + /* tx, rx, pcs */
> + lane-offsets = <0x0 0x200 0x400>;
> + #phy-cells = <1>;
> +
> + clocks = <&gcc GCC_PCIE_PHY_AUX_CLK>,
> + <&gcc GCC_PCIE_PHY_CFG_AHB_CLK>,
> + <&rpmcc MSM8996_RPM_SMD_LN_BB_CLK>,
> + <&gcc GCC_PCIE_CLKREF_CLK>,
> + <&gcc GCC_PCIE_0_PIPE_CLK>,
> + <&gcc GCC_PCIE_1_PIPE_CLK>,
> + <&gcc GCC_PCIE_2_PIPE_CLK>;
> + clock-names = "aux", "cfg_ahb",
> + "ref_clk_src", "ref_clk",

Does MSM8996_RPM_SMD_LN_BB_CLK supply the clock source for
GCC_PCIE_CLKREF_CLK? Did we mess up the parent/child relationship
in the GCC driver? We may want to fix that so that this node
only references clocks that actually go into the device, instead
of clock parents.

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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