linux-kernel - [PATCH v1 04/12] of: Add bindings of gpu hw throttle for Tegra soctherm

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Message-ID: <1545118484-23641-6-git-send-email-wni@nvidia.com>
Date:   Tue, 18 Dec 2018 15:34:36 +0800
From:   Wei Ni <wni@...dia.com>
To:     <thierry.reding@...il.com>, <daniel.lezcano@...aro.org>,
        <edubezval@...il.com>, <linux-tegra@...r.kernel.org>
CC:     <rui.zhang@...el.com>, <srikars@...dia.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Wei Ni <wni@...dia.com>
Subject: [PATCH v1 04/12] of: Add bindings of gpu hw throttle for Tegra soctherm

Add "nvidia,gpu-throt-level" property to set gpu hw
throttle level.

Signed-off-by: Wei Ni <wni@...dia.com>
---
 .../bindings/thermal/nvidia,tegra124-soctherm.txt  | 17 +++++++++++++++--
 include/dt-bindings/thermal/tegra124-soctherm.h    | 22 ++++++++++++++++++----
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
index ab66d6feab4b..cf6d0be56b7a 100644
--- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
+++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
@@ -52,6 +52,15 @@ Required properties :
         Must set as following values:
         TEGRA_SOCTHERM_THROT_LEVEL_LOW, TEGRA_SOCTHERM_THROT_LEVEL_MED
         TEGRA_SOCTHERM_THROT_LEVEL_HIGH, TEGRA_SOCTHERM_THROT_LEVEL_NONE
+      - nvidia,gpu-throt-level: This property is for Tegra124 and Tegra210.
+        It is the level of pulse skippers, which used to throttle clock
+        frequencies. It indicates gpu clock throttling depth and can be
+        programmed to any of the following values which represent a throttling
+        percentage:
+        TEGRA_SOCTHERM_THROT_LEVEL_NONE (0%)
+        TEGRA_SOCTHERM_THROT_LEVEL_LOW (50%),
+        TEGRA_SOCTHERM_THROT_LEVEL_MED (75%),
+        TEGRA_SOCTHERM_THROT_LEVEL_HIGH (85%).
       - #cooling-cells: Should be 1. This cooling device only support on/off state.
         See ./thermal.txt for a description of this property.
 
@@ -96,22 +105,26 @@ Example :
 		throttle-cfgs {
 			/*
 			 * When the "heavy" cooling device triggered,
-			 * the HW will skip cpu clock's pulse in 85% depth
+			 * the HW will skip cpu clock's pulse in 85% depth,
+			 * skip gpu clock's pulse in 85% level
 			 */
 			throttle_heavy: heavy {
 				nvidia,priority = <100>;
 				nvidia,cpu-throt-percent = <85>;
+				nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>;
 
 				#cooling-cells = <1>;
 			};
 
 			/*
 			 * When the "light" cooling device triggered,
-			 * the HW will skip cpu clock's pulse in 50% depth
+			 * the HW will skip cpu clock's pulse in 50% depth,
+			 * skip gpu clock's pulse in 50% level
 			 */
 			throttle_light: light {
 				nvidia,priority = <80>;
 				nvidia,cpu-throt-percent = <50>;
+				nvidia,gpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_LOW>;
 
 				#cooling-cells = <1>;
 			};
diff --git a/include/dt-bindings/thermal/tegra124-soctherm.h b/include/dt-bindings/thermal/tegra124-soctherm.h
index c15e8b709a0d..75853df1c609 100644
--- a/include/dt-bindings/thermal/tegra124-soctherm.h
+++ b/include/dt-bindings/thermal/tegra124-soctherm.h
@@ -1,5 +1,19 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
+ * Copyright (c) 2014 - 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author:
+ *      Mikko Perttunen <mperttunen@...dia.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
  * This header provides constants for binding nvidia,tegra124-soctherm.
  */
 
@@ -12,9 +26,9 @@
 #define TEGRA124_SOCTHERM_SENSOR_PLLX 3
 #define TEGRA124_SOCTHERM_SENSOR_NUM 4
 
-#define TEGRA_SOCTHERM_THROT_LEVEL_LOW  0
-#define TEGRA_SOCTHERM_THROT_LEVEL_MED  1
-#define TEGRA_SOCTHERM_THROT_LEVEL_HIGH 2
-#define TEGRA_SOCTHERM_THROT_LEVEL_NONE -1
+#define TEGRA_SOCTHERM_THROT_LEVEL_NONE 0
+#define TEGRA_SOCTHERM_THROT_LEVEL_LOW  1
+#define TEGRA_SOCTHERM_THROT_LEVEL_MED  2
+#define TEGRA_SOCTHERM_THROT_LEVEL_HIGH 3
 
 #endif
-- 
2.7.4