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Message-Id: <20180918215124.14003-5-jae.hyun.yoo@linux.intel.com>
Date: Tue, 18 Sep 2018 14:51:16 -0700
From: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
To: Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
Mark Rutland <mark.rutland@....com>,
Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>,
Jonathan Corbet <corbet@....net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Kishon Vijay Abraham I <kishon@...com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
"Darrick J . Wong" <darrick.wong@...cle.com>,
Eric Sandeen <sandeen@...hat.com>,
Arnd Bergmann <arnd@...db.de>, Wu Hao <hao.wu@...el.com>,
Tomohiro Kusumi <kusumi.tomohiro@...il.com>,
"Bryant G . Ly" <bryantly@...ux.vnet.ibm.com>,
Frederic Barrat <fbarrat@...ux.vnet.ibm.com>,
"David S . Miller" <davem@...emloft.net>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Randy Dunlap <rdunlap@...radead.org>,
Philippe Ombredanne <pombredanne@...b.com>,
Vinod Koul <vkoul@...nel.org>,
Stephen Boyd <sboyd@...eaurora.org>,
David Kershner <david.kershner@...sys.com>,
Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>,
Sagar Dharia <sdharia@...eaurora.org>,
Johan Hovold <johan@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Juergen Gross <jgross@...e.com>,
Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Cc: linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-aspeed@...ts.ozlabs.org, linux-doc@...r.kernel.org,
openbmc@...ts.ozlabs.org,
Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Jason M Biils <jason.m.bills@...ux.intel.com>,
Milton Miller II <miltonm@...ibm.com>,
Pavel Machek <pavel@....cz>,
Robin Murphy <robin.murphy@....com>,
Ryan Chen <ryan_chen@...eedtech.com>
Subject: [PATCH v8 04/12] dt-bindings: Add a document of PECI adapter driver for ASPEED AST24xx/25xx SoCs
This commit adds a dt-bindings document of PECI adapter driver for ASPEED
AST24xx/25xx SoCs.
Cc: Mark Rutland <mark.rutland@....com>
Cc: Joel Stanley <joel@....id.au>
Cc: Andrew Jeffery <andrew@...id.au>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jason M Biils <jason.m.bills@...ux.intel.com>
Cc: Milton Miller II <miltonm@...ibm.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Ryan Chen <ryan_chen@...eedtech.com>
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Reviewed-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
Reviewed-by: James Feist <james.feist@...ux.intel.com>
Reviewed-by: Vernon Mauery <vernon.mauery@...ux.intel.com>
Reviewed-by: Rob Herring <robh@...nel.org>
---
.../devicetree/bindings/peci/peci-aspeed.txt | 55 +++++++++++++++++++
1 file changed, 55 insertions(+)
create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt
diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
new file mode 100644
index 000000000000..cdca73a3b7d8
--- /dev/null
+++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt
@@ -0,0 +1,55 @@
+Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs.
+
+Required properties:
+- compatible : Should be one of:
+ "aspeed,ast2400-peci"
+ "aspeed,ast2500-peci"
+- reg : Should contain PECI controller registers location and
+ length.
+- #address-cells : Should be <1> required to define a client address.
+- #size-cells : Should be <0> required to define a client address.
+- interrupts : Should contain PECI controller interrupt.
+- clocks : Should contain clock source for PECI controller. Should
+ reference the external oscillator clock in the second
+ cell.
+- resets : Should contain phandle to reset controller with the reset
+ number in the second cell.
+- clock-frequency : Should contain the operation frequency of PECI controller
+ in units of Hz.
+ 187500 ~ 24000000
+
+Optional properties:
+- msg-timing : Message timing negotiation period. This value will
+ determine the period of message timing negotiation to be
+ issued by PECI controller. The unit of the programmed
+ value is four times of PECI clock period.
+ 0 ~ 255 (default: 1)
+- addr-timing : Address timing negotiation period. This value will
+ determine the period of address timing negotiation to be
+ issued by PECI controller. The unit of the programmed
+ value is four times of PECI clock period.
+ 0 ~ 255 (default: 1)
+- rd-sampling-point : Read sampling point selection. The whole period of a bit
+ time will be divided into 16 time frames. This value will
+ determine the time frame in which the controller will
+ sample PECI signal for data read back. Usually in the
+ middle of a bit time is the best.
+ 0 ~ 15 (default: 8)
+- cmd-timeout-ms : Command timeout in units of ms.
+ 1 ~ 60000 (default: 1000)
+
+Example:
+ peci0: peci-bus@0 {
+ compatible = "aspeed,ast2500-peci";
+ reg = <0x0 0x60>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ interrupts = <15>;
+ clocks = <&syscon ASPEED_CLK_GATE_REFCLK>;
+ resets = <&syscon ASPEED_RESET_PECI>;
+ clock-frequency = <24000000>;
+ msg-timing = <1>;
+ addr-timing = <1>;
+ rd-sampling-point = <8>;
+ cmd-timeout-ms = <1000>;
+ };
--
2.18.0
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