From: peter.griffin@linaro.org (Peter Griffin)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 2/3] usb: dwc3: dwc3-st: Add st-dwc3 devicetree bindings documentation
Date: Fri, 5 Sep 2014 16:36:31 +0100 [thread overview]
Message-ID: <1409931392-22340-3-git-send-email-peter.griffin@linaro.org> (raw)
In-Reply-To: <1409931392-22340-1-git-send-email-peter.griffin@linaro.org>
This patch documents the device tree documentation required for
the ST usb3 controller glue layer found in STiH407 devices.
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
Documentation/devicetree/bindings/usb/dwc3-st.txt | 68 +++++++++++++++++++++++
1 file changed, 68 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/dwc3-st.txt
diff --git a/Documentation/devicetree/bindings/usb/dwc3-st.txt b/Documentation/devicetree/bindings/usb/dwc3-st.txt
new file mode 100644
index 0000000..f9d7025
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3-st.txt
@@ -0,0 +1,68 @@
+ST DWC3 glue logic
+
+This file documents the parameters for the dwc3-st driver.
+This driver controls the glue logic used to configure the dwc3 core on
+STiH407 based platforms.
+
+Required properties:
+ - compatible : must be "st,stih407-dwc3"
+ - reg : glue logic base address and USB syscfg ctrl register offset
+ - reg-names : should be "reg-glue" and "syscfg-reg"
+ - st,syscon : should be phandle to system configuration node which
+ encompasses the glue registers
+ - resets : list of phandle and reset specifier pairs. There should be two entries, one
+ for the powerdown and softreset lines of the usb3 IP
+ - reset-names : list of reset signal names. Names should be "powerdown" and "softreset"
+See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
+See: Documentation/devicetree/bindings/reset/reset.txt
+
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+ with 'reg' property
+
+ - pinctl-names : A pinctrl state named "default" must be defined
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
+
+ - pinctrl-0 : Pin control group
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
+
+ - ranges : allows valid 1:1 translation between child's address space and
+ parent's address space
+
+Sub-nodes:
+The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
+example below. The DT binding details of dwc3 can be found in:
+Documentation/devicetree/bindings/usb/dwc3.txt
+
+NB: The dr_mode property described in [1] is NOT optional for this driver, as the default value
+is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are either "host"
+or "device".
+
+[1] Documentation/devicetree/bindings/usb/generic.txt
+
+Example:
+
+st_dwc3: dwc3 at 8f94000 {
+ status = "disabled";
+ compatible = "st,stih407-dwc3";
+ reg = <0x08f94000 0x1000>, <0x110 0x4>;
+ reg-names = "reg-glue", "syscfg-reg";
+ st,syscfg = <&syscfg_core>;
+ resets = <&powerdown STIH407_USB3_POWERDOWN>,
+ <&softreset STIH407_MIPHY2_SOFTRESET>;
+ reset-names = "powerdown",
+ "softreset";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_usb3>;
+ ranges;
+
+ dwc3: dwc3 at 9900000 {
+ compatible = "snps,dwc3";
+ reg = <0x09900000 0x100000>;
+ interrupts = <GIC_SPI 155 IRQ_TYPE_NONE>;
+ dr_mode = "host";
+ phys-names = "usb2-phy", "usb3-phy";
+ phys = <&usb2_picophy2>, <&phy_port2 MIPHY_TYPE_USB>;
+ };
+};
--
1.9.1
next prev parent reply other threads:[~2014-09-05 15:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-05 15:36 [PATCH v6 0/3] Add ST dwc3 glue layer driver Peter Griffin
2014-09-05 15:36 ` [PATCH v6 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC Peter Griffin
2014-09-05 15:47 ` Felipe Balbi
2014-09-05 15:53 ` Felipe Balbi
2014-09-05 16:55 ` Peter Griffin
2014-09-05 16:56 ` Felipe Balbi
2014-09-05 15:36 ` Peter Griffin [this message]
2014-09-05 15:36 ` [PATCH v6 3/3] MAINTAINERS: Add dwc3-st.c file to ARCH/STI architecture Peter Griffin
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