linux-kernel - [RFC PATCH 1/7] dt-bindings: soc: Add DVFSRC driver bindings

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Date:   Wed, 2 Jan 2019 21:43:58 +0800
From:   Henry Chen <henryc.chen@...iatek.com>
To:     Viresh Kumar <vireshk@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Fan Chen <fan.chen@...iatek.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>,
        James Liao <jamesjj.liao@...iatek.com>,
        Kees Cook <keescook@...omium.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Henry Chen <henryc.chen@...iatek.com>
Subject: [RFC PATCH 1/7] dt-bindings: soc: Add DVFSRC driver bindings

Document the binding for enabling DVFSRC on MediaTek SoC.

Signed-off-by: Henry Chen <henryc.chen@...iatek.com>
---
 .../devicetree/bindings/soc/mediatek/dvfsrc.txt    | 26 ++++++++++++++++++++++
 include/dt-bindings/soc/mtk,dvfsrc.h               | 18 +++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt
 create mode 100644 include/dt-bindings/soc/mtk,dvfsrc.h

diff --git a/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt b/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt
new file mode 100644
index 0000000..402c885
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt
@@ -0,0 +1,26 @@
+MediaTek DVFSRC Driver
+
+The Dynamic Voltage and Frequency Scaling Resource Collector (DVFSRC) is a
+HW module which is used to collect all the requests from both software and
+hardware and turn into the decision of minimum operating voltage and minimum
+DRAM frequency to fulfill those requests.
+
+Required Properties:
+- compatible: Should be one of the following
+	- "mediatek,mt8183-dvfsrc": For MT8183 SoC
+- reg: Address range of the DVFSRC unit
+- dram_type: Refer to <include/dt-bindings/soc/mtk,dvfsrc.h> for the
+	different dram type support.
+- clock-names: Must include the following entries:
+	"dvfsrc": DVFSRC module clock
+- clocks: Must contain an entry for each entry in clock-names.
+
+Example:
+
+	dvfsrc_top@...12000 {
+		compatible = "mediatek,mt8183-dvfsrc";
+		reg = <0 0x10012000 0 0x1000>;
+		clocks = <&infracfg CLK_INFRA_DVFSRC>;
+		clock-names = "dvfsrc";
+		dram_type = <MT8183_DVFSRC_OPP_LP4>;
+	};
diff --git a/include/dt-bindings/soc/mtk,dvfsrc.h b/include/dt-bindings/soc/mtk,dvfsrc.h
new file mode 100644
index 0000000..60b3497
--- /dev/null
+++ b/include/dt-bindings/soc/mtk,dvfsrc.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2018 MediaTek Inc.
+ */
+
+#ifndef _DT_BINDINGS_POWER_MTK_DVFSRC_H
+#define _DT_BINDINGS_POWER_MTK_DVFSRC_H
+
+#define MT8183_DVFSRC_OPP_LP4	0
+#define MT8183_DVFSRC_OPP_LP4X	1
+#define MT8183_DVFSRC_OPP_LP3	2
+
+#define MT8183_DVFSRC_LEVEL_1	1
+#define MT8183_DVFSRC_LEVEL_2	2
+#define MT8183_DVFSRC_LEVEL_3	3
+#define MT8183_DVFSRC_LEVEL_4	4
+
+#endif /* _DT_BINDINGS_POWER_MTK_DVFSRC_H */
-- 
1.9.1