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Subject[PATCH v4 05/19] dt-bindings: soc: tegra-pmc: Add Tegra PMC clock bindings
Date
Tegra PMC has 3 clocks clk_out_1, clk_out_2, and clk_out_3.

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

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
.../bindings/arm/tegra/nvidia,tegra20-pmc.txt | 37 +++++++++++++++++++++-
include/dt-bindings/soc/tegra-pmc.h | 15 +++++++++
2 files changed, 51 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..80cdcad4ab8c 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 +305,31 @@ 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 osc, osc_div2, osc_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:
+ i2c@7000c500 {
+ cam_sensor {
+ ...
+ clocks = <&pmc TEGRA_PMC_CLK_OUT_3>;
+ clock-names = "mclk";
+ assigned-clocks = <&pmc TEGRA_PMC_CLK_OUT_3>;
+ assigned-clock-parents = <&tegra_car TEGRA210_CLK_EXTERN3>;
+ ...
+ };
+ };
diff --git a/include/dt-bindings/soc/tegra-pmc.h b/include/dt-bindings/soc/tegra-pmc.h
new file mode 100644
index 000000000000..f7c866404456
--- /dev/null
+++ b/include/dt-bindings/soc/tegra-pmc.h
@@ -0,0 +1,15 @@
+/* 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 0
+#define TEGRA_PMC_CLK_OUT_2 1
+#define TEGRA_PMC_CLK_OUT_3 2
+
+#define TEGRA_PMC_CLK_MAX 3
+
+#endif /* _DT_BINDINGS_SOC_TEGRA_PMC_H */
--
2.7.4
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