openwrt/target/linux/ipq806x/patches-4.4/110-DT-PCI-qcom-Document-PCIe-devicetree-bindings.patch

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Subject: [v2,3/5] DT: PCI: qcom: Document PCIe devicetree bindings
From: Stanimir Varbanov <svarbanov@mm-sol.com>
X-Patchwork-Id: 6326181
Message-Id: <1430743338-10441-4-git-send-email-svarbanov@mm-sol.com>
To: Rob Herring <robh+dt@kernel.org>, Kumar Gala <galak@codeaurora.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Grant Likely <grant.likely@linaro.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	Russell King <linux@arm.linux.org.uk>, Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	linux-pci@vger.kernel.org, Mathieu Olivari <mathieu@codeaurora.org>,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	Stanimir Varbanov <svarbanov@mm-sol.com>
Date: Mon,  4 May 2015 15:42:16 +0300

Document Qualcomm PCIe driver devicetree bindings.

Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com>

---
.../devicetree/bindings/pci/qcom,pcie.txt          |  231 ++++++++++++++++++++
 1 files changed, 231 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/qcom,pcie.txt

--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/qcom,pcie.txt
@@ -0,0 +1,231 @@
+* Qualcomm PCI express root complex
+
+- compatible:
+	Usage: required
+	Value type: <stringlist>
+	Definition: Value shall include
+		    - "qcom,pcie-v0" for apq/ipq8064
+		    - "qcom,pcie-v1" for apq8084
+
+- reg:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: Register ranges as listed in the reg-names property
+
+- reg-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: Must include the following entries
+		    - "parf"   Qualcomm specific registers
+		    - "dbi"    Designware PCIe registers
+		    - "elbi"   External local bus interface registers
+		    - "config" PCIe configuration space
+
+- device_type:
+	Usage: required
+	Value type: <string>
+	Definition: Should be "pci". As specified in designware-pcie.txt
+
+- #address-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: Should be set to 3. As specified in designware-pcie.txt
+
+- #size-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: Should be set 2. As specified in designware-pcie.txt
+
+- ranges:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: As specified in designware-pcie.txt
+
+- interrupts:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: MSI interrupt
+
+- interrupt-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: Should contain "msi"
+
+- #interrupt-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: Should be 1. As specified in designware-pcie.txt
+
+- interrupt-map-mask:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: As specified in designware-pcie.txt
+
+- interrupt-map:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: As specified in designware-pcie.txt
+
+- clocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: List of phandle and clock specifier pairs as listed
+		    in clock-names property
+
+- clock-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: Should contain the following entries
+		    * should be populated for v0 and v1
+		    	- "iface"      Configuration AHB clock
+
+		    * should be populated for v0
+		    	- "core"       Clocks the pcie hw block
+		    	- "phy"        Clocks the pcie PHY block
+
+		    * should be populated for v1
+			- "aux"        Auxiliary (AUX) clock
+		    	- "bus_master" Master AXI clock
+		    	- "bus_slave"  Slave AXI clock
+
+- resets:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: List of phandle and reset specifier pairs as listed
+		    in reset-names property
+
+- reset-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: Should contain the following entries
+		    * should be populated for v0
+			- "axi"  AXI reset
+			- "ahb"  AHB reset
+			- "por"  POR reset
+			- "pci"  PCI reset
+			- "phy"  PHY reset
+
+		    * should be populated for v1
+			- "core" Core reset
+
+- power-domains:
+	Usage: required (for v1 only)
+	Value type: <prop-encoded-array>
+	Definition: A phandle and power domain specifier pair to the
+		    power domain which is responsible for collapsing
+		    and restoring power to the peripheral
+
+- <name>-supply:
+	Usage: required
+	Value type: <phandle>
+	Definition: List of phandles to the power supply regulator(s)
+		    * should be populated for v0 and v1
+			- "vdda"        core analog power supply
+
+		    * should be populated for v0
+			- "vdda_phy"    analog power supply for PHY
+			- "vdda_refclk" analog power supply for IC which generate
+					reference clock
+
+- phys:
+	Usage: required (for v1 only)
+	Value type: <phandle>
+	Definition: List of phandle(s) as listed in phy-names property
+
+- phy-names:
+	Usage: required (for v1 only)
+	Value type: <stringlist>
+	Definition: Should contain "pciephy"
+
+- <name>-gpio:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: List of phandle and gpio specifier pairs. Should contain
+		    - "perst"  PCIe endpoint reset signal line
+		    - "pewake" PCIe endpoint wake signal line
+
+- pinctrl-0:
+	Usage: required
+	Value type: <phandle>
+	Definition: List of phandles pointing at a pin(s) configuration
+
+- pinctrl-names
+	Usage: required
+	Value type: <stringlist>
+	Definition: List of names of pinctrl-0 state
+
+* Example for v0
+	pcie0: pci@1b500000 {
+		compatible = "qcom,pcie-v0";
+		reg = <0x1b500000 0x1000
+		       0x1b502000 0x80
+		       0x1b600000 0x100
+		       0x0ff00000 0x100000>;
+		reg-names = "dbi", "elbi", "parf", "config";
+		device_type = "pci";
+		linux,pci-domain = <0>;
+		bus-range = <0x00 0xff>;
+		num-lanes = <1>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+		ranges = <0x81000000 0 0	  0x0fe00000 0 0x00100000   /* I/O */
+			  0x82000000 0 0x00000000 0x08000000 0 0x07e00000>; /* memory */
+		interrupts = <GIC_SPI 35 IRQ_TYPE_NONE>;
+		interrupt-names = "msi";
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 0x7>;
+		interrupt-map = <0 0 0 1 &intc 0 36 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
+				<0 0 0 2 &intc 0 37 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
+				<0 0 0 3 &intc 0 38 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
+				<0 0 0 4 &intc 0 39 IRQ_TYPE_LEVEL_HIGH>; /* int_d */
+		clocks = <&gcc PCIE_A_CLK>,
+			 <&gcc PCIE_H_CLK>,
+			 <&gcc PCIE_PHY_CLK>;
+		clock-names = "core", "iface", "phy";
+		resets = <&gcc PCIE_ACLK_RESET>,
+			 <&gcc PCIE_HCLK_RESET>,
+			 <&gcc PCIE_POR_RESET>,
+			 <&gcc PCIE_PCI_RESET>,
+			 <&gcc PCIE_PHY_RESET>;
+		reset-names = "axi", "ahb", "por", "pci", "phy";
+	};
+
+* Example for v1
+	pcie0@fc520000 {
+		compatible = "qcom,pcie-v1";
+		reg = <0xfc520000 0x2000>,
+		      <0xff000000 0x1000>,
+		      <0xff001000 0x1000>,
+		      <0xff002000 0x2000>;
+		reg-names = "parf", "dbi", "elbi", "config";
+		device_type = "pci";
+		linux,pci-domain = <0>;
+		bus-range = <0x00 0xff>;
+		num-lanes = <1>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+		ranges = <0x81000000 0 0          0xff200000 0 0x00100000   /* I/O */
+			  0x82000000 0 0x00300000 0xff300000 0 0x00d00000>; /* memory */
+		interrupts = <GIC_SPI 243 IRQ_TYPE_NONE>;
+		interrupt-names = "msi";
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 0x7>;
+		interrupt-map = <0 0 0 1 &intc 0 244 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
+				<0 0 0 2 &intc 0 245 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
+				<0 0 0 3 &intc 0 247 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
+				<0 0 0 4 &intc 0 248 IRQ_TYPE_LEVEL_HIGH>; /* int_d */
+		clocks = <&gcc GCC_PCIE_0_CFG_AHB_CLK>,
+			 <&gcc GCC_PCIE_0_MSTR_AXI_CLK>,
+			 <&gcc GCC_PCIE_0_SLV_AXI_CLK>,
+			 <&gcc GCC_PCIE_0_AUX_CLK>;
+		clock-names = "iface", "master_bus", "slave_bus", "aux";
+		resets = <&gcc GCC_PCIE_0_BCR>;
+		reset-names = "core";
+		power-domains = <&gcc PCIE0_GDSC>;
+		vdda-supply = <&pma8084_l3>;
+		phys = <&pciephy0>;
+		phy-names = "pciephy";
+		perst-gpio = <&tlmm 70 GPIO_ACTIVE_LOW>;
+		pinctrl-0 = <&pcie0_pins_default>;
+		pinctrl-names = "default";
+	};