[PATCH v3 01/15] dt-bindings: soc: tegra-pmc: Add Tegra PMC clock bindings

[Sowjanya Komatineni]

Tegra PMC has clk_out_1, clk_out_2, clk_out_3 clocks and each of
these clocks has mux and a gate as a part of PMC controller.

This patch documents PMC clock bindings and adds a header defining
Tegra PMC clock ids.

Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
---
 .../bindings/arm/tegra/nvidia,tegra20-pmc.txt      | 45 +++++++++++++++++++++-
 include/dt-bindings/soc/tegra-pmc.h                | 18 +++++++++
 2 files changed, 62 insertions(+), 1 deletion(-)
 create mode 100644 include/dt-bindings/soc/tegra-pmc.h

diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
index cb12f33a247f..cd895423ccfd 100644
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
@@ -21,6 +21,10 @@ Required properties:
 - clock-names : Must include the following entries:
   "pclk" (The Tegra clock of that name),
   "clk32k_in" (The 32KHz clock input to Tegra).
+- #clock-cells : Should be 1 for Tegra30 and higher.
+  In clock consumers, this cell represents the PMC clock ID.
+  The assignments may be found in header file
+  <dt-bindings/soc/tegra-pmc.h>.
 
 Optional properties:
 - nvidia,invert-interrupt : If present, inverts the PMU interrupt signal.
@@ -80,11 +84,12 @@ Optional nodes:
 Example:
 
 / SoC dts including file
-pmc@7000f400 {
+pmc: pmc@7000f400 {
 	compatible = "nvidia,tegra20-pmc";
 	reg = <0x7000e400 0x400>;
 	clocks = <&tegra_car 110>, <&clk32k_in>;
 	clock-names = "pclk", "clk32k_in";
+	#clock-cells = <1>;
 	nvidia,invert-interrupt;
 	nvidia,suspend-mode = <1>;
 	nvidia,cpu-pwr-good-time = <2000>;
@@ -171,6 +176,7 @@ Example:
 		reg = <0x0 0x7000e400 0x0 0x400>;
 		clocks = <&tegra_car TEGRA210_CLK_PCLK>, <&clk32k_in>;
 		clock-names = "pclk", "clk32k_in";
+		#clock-cells = <1>;
 
 		powergates {
 			pd_audio: aud {
@@ -260,6 +266,7 @@ Pad configuration state example:
 		reg = <0x0 0x7000e400 0x0 0x400>;
 		clocks = <&tegra_car TEGRA210_CLK_PCLK>, <&clk32k_in>;
 		clock-names = "pclk", "clk32k_in";
+		#clock-cells = <1>;
 
 		...
 
@@ -298,3 +305,39 @@ Pinctrl client example:
 		pinctrl-1 = <&hdmi_on>;
 		pinctrl-names = "hdmi-on", "hdmi-off";
 	};
+
+== Clock Control ==
+
+Tegra PMC has 3 clocks clk_1, clk_2 and clk_3. Each of these clocks has
+source selection and enable/disable gate.
+Parent/source for these clocks can be either of clk_m, clk_m_div2, clk_m_div4,
+or extern clock from Tegra CAR module.
+
+Clock configuration example:
+	pmc: pmc@7000e400 {
+		compatible = "nvidia,tegra210-pmc";
+		reg = <0x0 0x7000e400 0x0 0x400>;
+		clocks = <&tegra_car TEGRA210_CLK_PCLK>, <&clk32k_in>;
+		clock-names = "pclk", "clk32k_in";
+		#clock-cells = <1>;
+	};
+
+Clock consumer example:
+	host1x@50000000 {
+		...
+		vi@54080000 {
+			...
+			assigned-clocks = <&pmc TEGRA_PMC_CLK_OUT_3_MUX>;
+			assigned-clock-parents = <&tegra_car TEGRA210_CLK_EXTERN3>;
+		};
+		...
+	};
+	...
+	i2c@7000c500 {
+		cam_sensor {
+			...
+			clocks = <&pmc TEGRA_PMC_CLK_OUT_3>;
+			clock-names = "mclk";
+			...
+		};
+	};
diff --git a/include/dt-bindings/soc/tegra-pmc.h b/include/dt-bindings/soc/tegra-pmc.h
new file mode 100644
index 000000000000..705ee8083070
--- /dev/null
+++ b/include/dt-bindings/soc/tegra-pmc.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2019-2020, NVIDIA CORPORATION.  All rights reserved.
+ */
+
+#ifndef _DT_BINDINGS_SOC_TEGRA_PMC_H
+#define _DT_BINDINGS_SOC_TEGRA_PMC_H
+
+#define TEGRA_PMC_CLK_OUT_1_MUX		0
+#define TEGRA_PMC_CLK_OUT_1		1
+#define TEGRA_PMC_CLK_OUT_2_MUX		2
+#define TEGRA_PMC_CLK_OUT_2		3
+#define TEGRA_PMC_CLK_OUT_3_MUX		4
+#define TEGRA_PMC_CLK_OUT_3		5
+
+#define TEGRA_PMC_CLK_MAX		6
+
+#endif	/* _DT_BINDINGS_SOC_TEGRA_PMC_H */
-- 
2.7.4