linux-kernel - [PATCH v2 1/5] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr1-alt-addr' property

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Message-Id: <20200923062510.38253-1-ran.wang_1@nxp.com>
Date:   Wed, 23 Sep 2020 14:25:06 +0800
From:   Ran Wang <ran.wang_1@....com>
To:     Li Yang <leoyang.li@....com>, Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Biwen Li <biwen.li@....com>,
        Ran Wang <ran.wang_1@....com>
Subject: [PATCH v2 1/5] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr1-alt-addr' property

From: Biwen Li <biwen.li@....com>

The 'fsl,ippdexpcr1-alt-addr' property is used to handle an errata A-008646
on LS1021A

Signed-off-by: Biwen Li <biwen.li@....com>
Signed-off-by: Ran Wang <ran.wang_1@....com>
---
Change in v2:
 - None

 Documentation/devicetree/bindings/soc/fsl/rcpm.txt | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
index 5a33619..1be58a3 100644
--- a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+++ b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
@@ -34,6 +34,11 @@ Chassis Version		Example Chips
 Optional properties:
  - little-endian : RCPM register block is Little Endian. Without it RCPM
    will be Big Endian (default case).
+ - fsl,ippdexpcr1-alt-addr : The property is related to a hardware issue
+   on SoC LS1021A and only needed on SoC LS1021A.
+   Must include 2 entries:
+   The first entry must be a link to the SCFG device node.
+   The 2nd entry must be offset of register IPPDEXPCR1 in SCFG.
 
 Example:
 The RCPM node for T4240:
@@ -43,6 +48,20 @@ The RCPM node for T4240:
 		#fsl,rcpm-wakeup-cells = <2>;
 	};
 
+The RCPM node for LS1021A:
+	rcpm: rcpm@...2140 {
+		compatible = "fsl,ls1021a-rcpm", "fsl,qoriq-rcpm-2.1+";
+		reg = <0x0 0x1ee2140 0x0 0x8>;
+		#fsl,rcpm-wakeup-cells = <2>;
+
+		/*
+		 * The second and third entry compose an alt offset
+		 * address for IPPDEXPCR1(SCFG_SPARECR8)
+		 */
+		fsl,ippdexpcr1-alt-addr = <&scfg 0x51c>;
+	};
+
+
 * Freescale RCPM Wakeup Source Device Tree Bindings
 -------------------------------------------
 Required fsl,rcpm-wakeup property should be added to a device node if the device
-- 
2.7.4