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Subject[PATCH v1 1/2] dt-bindings: usb: Update documentation for Qualcomm DWC3 driver
Date
Existing documentation has lot of incorrect information as it
was originally added for a driver that no longer exists.

Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
---
.../devicetree/bindings/usb/qcom,dwc3.txt | 87 +++++++++++++++-------
1 file changed, 59 insertions(+), 28 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.txt b/Documentation/devicetree/bindings/usb/qcom,dwc3.txt
index bc8a2fa..df312f7 100644
--- a/Documentation/devicetree/bindings/usb/qcom,dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.txt
@@ -1,54 +1,85 @@
Qualcomm SuperSpeed DWC3 USB SoC controller

Required properties:
-- compatible: should contain "qcom,dwc3"
-- clocks: A list of phandle + clock-specifier pairs for the
- clocks listed in clock-names
-- clock-names: Should contain the following:
- "core" Master/Core clock, have to be >= 125 MHz for SS
- operation and >= 60MHz for HS operation
-
-Optional clocks:
- "iface" System bus AXI clock. Not present on all platforms
- "sleep" Sleep clock, used when USB3 core goes into low
- power mode (U3).
+- compatible: should contain "qcom,dwc3"
+- reg: offset and length of register set for QSCRATCH wrapper
+- reg-names: should be "qscratch"
+- power-domains: specifies a phandle to PM domain provider node
+- clocks: list of phandle + clock-specifier pairs
+- assigned-clocks: should be:
+ MOCK_UTMI_CLK
+ MASTER_CLK
+- assigned-clock-rates: should be:
+ 19.2Mhz (192000000) for MOCK_UTMI_CLK
+ >=125Mhz (125000000) for MASTER_CLK in SS mode
+ >=60Mhz (60000000) for MASTER_CLK in HS mode
+
+Optional properties:
+- resets: list of phandle and reset specifier pairs
+- interrupts: specifies interrupts from controller wrapper used
+ to wakeup from low power/susepnd state. Must contain
+ one or more entry for interrupt-names property
+- interrupt-names: Must include the following entries:
+ - "hs_phy_irq": The interrupt that is asserted when a
+ wakeup event is received on USB2 bus
+ - "ss_phy_irq": The interrupt that is asserted when a
+ wakeup event is received on USB3 bus
+ - "dm_hs_phy_irq" and "dp_hs_phy_irq": Separate
+ interrupts for any wakeup event on DM and DP lines
+- qcom,select-utmi-as-pipe-clk: if present, disable USB3 pipe_clk requirement.
+ Used when dwc3 operates without SSPHY and only
+ HS/FS/LS modes are supported.

Required child node:
A child node must exist to represent the core DWC3 IP block. The name of
the node is not important. The content of the node is defined in dwc3.txt.

Phy documentation is provided in the following places:
-Documentation/devicetree/bindings/phy/qcom-dwc3-usb-phy.txt
+Documentation/devicetree/bindings/phy/qcom-qmp-phy.txt - USB3 QMP PHY
+Documentation/devicetree/bindings/phy/qcom-qusb2-phy.txt - USB2 QUSB2 PHY

Example device nodes:

hs_phy: phy@100f8800 {
- compatible = "qcom,dwc3-hs-usb-phy";
- reg = <0x100f8800 0x30>;
- clocks = <&gcc USB30_0_UTMI_CLK>;
- clock-names = "ref";
- #phy-cells = <0>;
-
+ compatible = "qcom,qusb2-v2-phy";
+ ...
};

ss_phy: phy@100f8830 {
- compatible = "qcom,dwc3-ss-usb-phy";
- reg = <0x100f8830 0x30>;
- clocks = <&gcc USB30_0_MASTER_CLK>;
- clock-names = "ref";
- #phy-cells = <0>;
-
+ compatible = "qcom,qmp-v3-usb3-phy";
+ ...
};

- usb3_0: usb30@0 {
+ usb3_0: usb30@a6f8800 {
compatible = "qcom,dwc3";
+ reg = <0xa6f8800 0x400>;
+ reg-names = "qscratch";
#address-cells = <1>;
#size-cells = <1>;
- clocks = <&gcc USB30_0_MASTER_CLK>;
- clock-names = "core";
-
ranges;

+ interrupts = <0 131 0>, <0 486 0>, <0 488 0>, <0 489 0>;
+ interrupt-names = "hs_phy_irq", "ss_phy_irq",
+ "dm_hs_phy_irq", "dp_hs_phy_irq";
+
+ clocks = <&clock_gcc GCC_CFG_NOC_USB3_PRIM_AXI_CLK>,
+ <&clock_gcc GCC_USB30_PRIM_MASTER_CLK>,
+ <&clock_gcc GCC_AGGRE_USB3_PRIM_AXI_CLK>,
+ <&clock_gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
+ <&clock_gcc GCC_USB30_PRIM_SLEEP_CLK>,
+ <&clock_gcc GCC_USB_PHY_CFG_AHB2PHY_CLK>,
+ <&clock_gcc GCC_USB3_PRIM_CLKREF_CLK>;
+ clock-names = "cfg_noc", "core", "aggr_noc", "utmi",
+ "sleep", "cfg_ahb", "ref";
+
+ assigned-clocks = <&clock_gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
+ <&clock_gcc GCC_USB30_PRIM_MASTER_CLK>;
+ assigned-clock-rates = <19200000>, <133000000>;
+
+ resets = <&clock_gcc GCC_USB30_PRIM_BCR>;
+ reset-names = "core_reset";
+ power-domains = <&clock_gcc USB30_PRIM_GDSC>;
+ qcom,select-utmi-as-pipe-clk;

dwc3@10000000 {
compatible = "snps,dwc3";
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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