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Message-ID: <20160620184607.4380-2-afd@ti.com>
Date: Mon, 20 Jun 2016 13:46:06 -0500
From: "Andrew F. Davis" <afd@...com>
To: Philipp Zabel <p.zabel@...gutronix.de>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>, Suman Anna <s-anna@...com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Andrew F. Davis" <afd@...com>
Subject: [PATCH v4 1/2] Documentation: dt: reset: Add TI syscon reset binding
Add TI syscon reset controller binding. This will hook to the reset
framework and use syscon/regmap to set reset bits. This allows reset
control of individual SoC subsytems and devices with memory-mapped
reset registers in a common register memory space.
Signed-off-by: Andrew F. Davis <afd@...com>
[s-anna@...com: revise the binding format]
Signed-off-by: Suman Anna <s-anna@...com>
---
.../devicetree/bindings/reset/ti-syscon-reset.txt | 83 ++++++++++++++++++++++
include/dt-bindings/reset/ti-syscon.h | 30 ++++++++
2 files changed, 113 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reset/ti-syscon-reset.txt
create mode 100644 include/dt-bindings/reset/ti-syscon.h
diff --git a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt
new file mode 100644
index 0000000..eb95bb5
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt
@@ -0,0 +1,83 @@
+TI SysCon Reset Controller
+=======================
+
+Almost all SoCs have hardware modules that require reset control in addition
+to clock and power control for their functionality. The reset control is
+typically provided by means of memory-mapped I/O registers. These registers are
+sometimes a part of a larger register space region implementing various
+functionalities. This register range is best represented as a syscon node to
+allow multiple entities to access their relevant registers in the common
+register space.
+
+A SysCon Reset Controller node defines a device that uses a syscon node
+and provides reset management functionality for various hardware modules
+present on the SoC.
+
+SysCon Reset Controller Node
+============================
+Each of the reset provider/controller nodes should be a child of a syscon
+node and have the following properties.
+
+Required properties:
+--------------------
+ - compatible : Should be "syscon-reset"
+ - #reset-cells : Should be 1. Please see the reset consumer node below
+ for usage details
+ - ti,reset-bits : Contains the reset control register information
+ Should contain 5 cells for each reset exposed to
+ consumers, defined as:
+ Cell #1 : register offset of the reset control
+ register from the syscon register base
+ Cell #2 : bit shift value for the reset in the
+ respective reset control register
+ Cell #3 : register offset of the reset status
+ register from the syscon register base
+ Cell #4 : bit shift value for the reset in the
+ respective reset status register
+ Cell #5 : Flags used to control reset behavior,
+ availible flags defined in the DT include
+ file <dt-bindings/reset/ti-syscon.h>
+
+SysCon Reset Consumer Nodes
+===========================
+Each of the reset consumer nodes should have the following properties,
+in addition to their own properties.
+
+Required properties:
+--------------------
+ - resets : A phandle to the reset controller node and a phandle to a
+ reset specifier node as defined above.
+
+Please also refer to Documentation/devicetree/bindings/reset/reset.txt for
+common reset controller usage by consumers.
+
+Example:
+--------
+The following example demonstrates a syscon node, the reset controller node
+using the syscon node, and a consumer (a DSP device) on the TI Keystone 2
+Edison SoC.
+
+/ {
+ soc {
+ psc: power-sleep-controller@...50000 {
+ compatible = "syscon", "simple-mfd";
+ reg = <0x02350000 0x1000>;
+
+ pscrst: psc-reset {
+ compatible = "ti,k2l-pscrst", "syscon-reset";
+ #reset-cells = <1>;
+
+ ti,reset-bits = <
+ 0xa3c 8 0x83c 8 RESET_ASSERT_CLEAR /* 0: pcrst-dsp0 */
+ 0xa40 5 0 0 RESET_TRIGGER_SET /* 1: pcrst-example */
+ >;
+ };
+ };
+
+ dsp0: dsp0 {
+ ...
+ resets = <&pscrst 0>;
+ ...
+ };
+ };
+};
diff --git a/include/dt-bindings/reset/ti-syscon.h b/include/dt-bindings/reset/ti-syscon.h
new file mode 100644
index 0000000..fedcfb7
--- /dev/null
+++ b/include/dt-bindings/reset/ti-syscon.h
@@ -0,0 +1,30 @@
+/*
+ * TI Syscon Reset definitions
+ *
+ * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef __DT_BINDINGS_RESET_TI_SYSCON_H__
+#define __DT_BINDINGS_RESET_TI_SYSCON_H__
+
+/* The reset is asserted by setting (vs clearing) the described bit */
+#define RESET_SET (1 << 0)
+/* This reset does not have a readable status bit */
+#define RESET_TRIGGER (1 << 1)
+
+#define RESET_ASSERT_CLEAR 0
+#define RESET_ASSERT_SET RESET_SET
+#define RESET_TRIGGER_CLEAR RESET_TRIGGER
+#define RESET_TRIGGER_SET (RESET_TRIGGER | RESET_SET)
+
+#endif
--
2.9.0
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