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Message-ID: <20161121213052.8684-2-afd@ti.com>
Date: Mon, 21 Nov 2016 15:30:51 -0600
From: "Andrew F. Davis" <afd@...com>
To: Nishanth Menon <nm@...com>, Tero Kristo <t-kristo@...com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>, Suman Anna <s-anna@...com>
CC: <linux-arm-kernel@...ts.infradead.org>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Andrew F . Davis" <afd@...com>
Subject: [PATCH v4 1/2] Documentation: dt: reset: Add TI SCI reset binding
Add TI SCI reset controller binding. This describes the DT binding
details for a reset controller node providing reset management services
to hardware blocks (reset consumers) using the Texas Instrument's System
Control Interface (TI SCI) protocol to communicate to a system controller
block present on the SoC.
Signed-off-by: Andrew F. Davis <afd@...com>
[s-anna@...com: revise the binding format]
Signed-off-by: Suman Anna <s-anna@...com>
Signed-off-by: Nishanth Menon <nm@...com>
Acked-by: Santosh Shilimkar <ssantosh@...nel.org>
---
.../devicetree/bindings/reset/ti,sci-reset.txt | 66 ++++++++++++++++++++++
MAINTAINERS | 2 +
include/dt-bindings/reset/k2g.h | 22 ++++++++
3 files changed, 90 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reset/ti,sci-reset.txt
create mode 100644 include/dt-bindings/reset/k2g.h
diff --git a/Documentation/devicetree/bindings/reset/ti,sci-reset.txt b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt
new file mode 100644
index 0000000..820c5d9
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/ti,sci-reset.txt
@@ -0,0 +1,66 @@
+Texas Instruments System Control Interface (TI-SCI) Reset Controller
+=====================================================================
+
+Some TI SoCs contain a system controller (like the Power Management Micro
+Controller (PMMC) on Keystone K2G SoC) that are responsible for controlling
+the state of the various hardware modules present on the SoC. Communication
+between the host processor running an OS and the system controller happens
+through a protocol called TI System Control Interface (TI-SCI protocol).
+For TI SCI details, please refer to the document,
+Documentation/devicetree/bindings/arm/keystone/ti,sci.txt
+
+TI-SCI Reset Controller Node
+============================
+This reset controller node uses the TI SCI protocol to perform the reset
+management of various hardware modules present on the SoC. Must be a child
+node of the associated TI-SCI system controller node.
+
+Required properties:
+--------------------
+ - compatible : Should be "ti,sci-reset"
+ - #reset-cells : Should be 2. Please see the reset consumer node below for
+ usage details.
+
+TI-SCI 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 and reset specifier pair, one pair for each reset
+ signal that affects the device, or that the device manages.
+ The phandle should point to the TI-SCI reset controller node,
+ and the reset specifier should have 2 cell-values. The first
+ cell should contain the device ID, the values of which are
+ specified in the <dt-bindings/genpd/<soc>.h> include file.
+ The second cell should contain the reset mask value used by
+ system controller, the values of which are specified in the
+ include file <dt-bindings/reset/<soc>.h>, where <soc> is the
+ name of the SoC involved, for example 'k2g'.
+
+Please also refer to Documentation/devicetree/bindings/reset/reset.txt for
+common reset controller usage by consumers.
+
+Example:
+--------
+The following example demonstrates both a TI-SCI reset controller node and a
+consumer (a DSP device) on the K2G SoC.
+
+#include <dt-bindings/genpd/k2g.h>
+#include <dt-bindings/reset/k2g.h>
+
+pmmc: pmmc {
+ compatible = "ti,k2g-sci";
+
+ k2g_reset: reset-controller {
+ compatible = "ti,sci-reset";
+ #reset-cells = <2>;
+ };
+};
+
+dsp0: dsp0 {
+ ...
+ resets = <&k2g_reset K2G_DEV_CGEM0 K2G_DEV_CGEM0_DSP0_RESET>;
+ ...
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 6e93976..accf991 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11899,6 +11899,8 @@ F: drivers/soc/ti/ti_sci_pm_domains.c
F: Documentation/devicetree/bindings/clock/ti,sci-clk.txt
F: include/dt-bindings/clock/k2g.h
F: drivers/clk/keystone/sci-clk.c
+F: Documentation/devicetree/bindings/reset/ti,sci-reset.txt
+F: include/dt-bindings/reset/k2g.h
THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
M: Hans Verkuil <hverkuil@...all.nl>
diff --git a/include/dt-bindings/reset/k2g.h b/include/dt-bindings/reset/k2g.h
new file mode 100644
index 0000000..00e2a9b
--- /dev/null
+++ b/include/dt-bindings/reset/k2g.h
@@ -0,0 +1,22 @@
+/*
+ * TI K2G SoC 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_K2G_H__
+#define __DT_BINDINGS_RESET_K2G_H__
+
+#define K2G_DEV_CGEM0_DSP0_RESET 0x1
+
+#endif
--
2.10.2
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