[PATCH v2 2/3] dt: Document Qualcomm APQ8084 pinctrl binding

[Georgi Djakov]

Define a new binding for the Qualcomm TLMM (Top-Level Mode Mux) based pin
controller inside the APQ8084.

Signed-off-by: Georgi Djakov <gdjakov@xxxxxxxxxx>
---
 .../bindings/pinctrl/qcom,apq8084-pinctrl.txt      |  104 ++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/qcom,apq8084-pinctrl.txt

diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,apq8084-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/qcom,apq8084-pinctrl.txt
new file mode 100644
index 0000000..d0d9a8e
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/qcom,apq8084-pinctrl.txt
@@ -0,0 +1,104 @@
+Qualcomm APQ8084 TLMM block
+
+Required properties:
+- compatible: "qcom,apq8084-pinctrl"
+- reg: Should be the base address and length of the TLMM block.
+- interrupts: Should be the parent IRQ of the TLMM block.
+- interrupt-controller: Marks the device node as an interrupt controller.
+- #interrupt-cells: Should be two.
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells : Should be two.
+                The first cell is the gpio pin number and the
+                second cell is used for optional parameters.
+
+Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
+a general description of GPIO and interrupt bindings.
+
+Please refer to pinctrl-bindings.txt in this directory for details of the
+common pinctrl bindings used by client devices, including the meaning of the
+phrase "pin configuration node".
+
+Qualcomm's pin configuration nodes act as a container for an abitrary number of
+subnodes. Each of these subnodes represents some desired configuration for a
+pin, a group, or a list of pins or groups. This configuration can include the
+mux function to select on those pin(s)/group(s), and various pin configuration
+parameters, such as pull-up, drive strength, etc.
+
+The name of each subnode is not important; all subnodes should be enumerated
+and processed purely based on their content.
+
+Each subnode only affects those parameters that are explicitly listed. In
+other words, a subnode that lists a mux function but no pin configuration
+parameters implies no information about any pin configuration parameters.
+Similarly, a pin subnode that describes a pullup parameter implies no
+information about e.g. the mux function.
+
+
+The following generic properties as defined in pinctrl-bindings.txt are valid
+to specify in a pin configuration subnode:
+
+ pins, function, bias-disable, bias-pull-down, bias-pull-up, drive-strength,
+ output-low, output-high.
+
+Non-empty subnodes must specify the 'pins' property.
+Note that not all properties are valid for all pins.
+
+Valid values for pins are:
+  gpio0-gpio146
+    Supports mux, bias and drive-strength
+
+  sdc1_clk, sdc1_cmd, sdc1_data, sdc2_clk, sdc2_cmd, sdc2_data
+    Supports bias and drive-strength
+
+Valid values for function are:
+adsp_ext, audio_ref, blsp_i2c1, blsp_i2c2, blsp_i2c3, blsp_i2c4, blsp_i2c5,
+blsp_i2c6, blsp_i2c7, blsp_i2c8, blsp_i2c9, blsp_i2c10, blsp_i2c11, blsp_i2c12,
+blsp_spi1, blsp_spi2, blsp_spi3, blsp_spi4, blsp_spi5, blsp_spi6, blsp_spi7,
+blsp_spi8, blsp_spi9, blsp_spi10, blsp_spi11, blsp_spi12, blsp_uart1,
+blsp_uart2, blsp_uart3, blsp_uart4, blsp_uart5, blsp_uart6, blsp_uart7,
+blsp_uart8, blsp_uart9, blsp_uart10, blsp_uart11, blsp_uart12, blsp_uim1,
+blsp_uim2, blsp_uim3, blsp_uim4, blsp_uim5, blsp_uim6, blsp_uim7, blsp_uim8,
+blsp_uim9, blsp_uim10, blsp_uim11, blsp_uim12, cam_mclk0, cam_mclk1, cam_mclk2,
+cam_mclk3, cci_async, cci_async_in0, cci_i2c0, cci_i2c1, cci_timer0, cci_timer1,
+cci_timer2, cci_timer3, cci_timer4, edp_hpd, gcc_gp1, gcc_gp2, gcc_gp3, gcc_obt,
+gcc_vtt, gp_mn, gp_pdm0, gp_pdm1, gp_pdm2, gp0_clk, gp1_clk, gpio, hdmi_cec,
+hdmi_ddc, hdmi_dtest, hdmi_hpd, hdmi_rcv, hsic, ldo_en, ldo_update, mdp_vsync,
+pci_e0, pci_e0_n, pci_e0_rst, pci_e1, pci_e1_rst, pci_e1_rst_n, pci_e1_clkreq_n,
+pri_mi2s, qua_mi2s, sata_act, sata_devsleep, sata_devsleep_n, sd_write,
+sdc_emmc_mode, sdc3, sdc4, sec_mi2s, slimbus, spdif_tx, spkr_i2s, spkr_i2s_ws,
+spss_geni, ter_mi2s, tsif1, tsif2, uim, uim_batt_alarm, gpio
+
+Example:
+
+	tlmm: pinctrl@fd510000 {
+		compatible = "qcom,apq8084-pinctrl";
+		reg = <0xfd510000 0x4000>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		interrupts = <0 208 0>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&uart2_default>;
+
+		uart2_default: uart2_default {
+			mux {
+				pins = "gpio4", "gpio5";
+				function = "blsp_uart2";
+			};
+
+			tx {
+				pins = "gpio4";
+				drive-strength = <4>;
+				bias-disable;
+			};
+
+
+			rx {
+				pins = "gpio5";
+				drive-strength = <2>;
+				bias-pull-up;
+			};
+		};
+	};
-- 
1.7.9.5

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