linux-kernel - [PATCH v3 1/5] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr1-alt-reg' property

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Message-Id: <20200929082234.36619-1-ran.wang_1@nxp.com>
Date:   Tue, 29 Sep 2020 16:22:30 +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 v3 1/5] Documentation: dt: binding: fsl: Add 'fsl,ippdexpcr1-alt-reg' property

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

The 'fsl,ippdexpcr1-alt-reg' 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 v3:
 - Simplize related proterty definition and rename it.

Change in v2:
 - None

 Documentation/devicetree/bindings/soc/fsl/rcpm.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
index 5a33619..62a22fc 100644
--- a/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
+++ b/Documentation/devicetree/bindings/soc/fsl/rcpm.txt
@@ -34,6 +34,9 @@ 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-reg : The property is trying to workaround a
+   hardware issue (found on SoC LS1021A only), if pressent, RCPM driver
+   will use SCFG_SPARECR8 as a shadow register for RCPM_IPPDEXPCR1.
 
 Example:
 The RCPM node for T4240:
@@ -43,6 +46,15 @@ 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>;
+		fsl,ippdexpcr1-alt-reg;
+	};
+
+
 * 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