linux-kernel - [PATCH 1/2] dt-bindings: fsi: Add optional property no-scan-on-init

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Message-Id: <20180130055116.17411-2-joel@jms.id.au>
Date:   Tue, 30 Jan 2018 16:21:15 +1030
From:   Joel Stanley <joel@....id.au>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Cc:     Christopher Bostic <cbostic@...ux.vnet.ibm.com>,
        Jeremy Kerr <jk@...abs.org>,
        Eddie James <eajames@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: fsi: Add optional property no-scan-on-init

From: Christopher Bostic <cbostic@...ux.vnet.ibm.com>

Add an optional FSI master property 'no-scan-on-init.  This
can be specified to indicate that a master should not be
automatically scanned at init time.  This is required in cases
where a scan could interfere with another FSI master on the same
bus.

Signed-off-by: Christopher Bostic <cbostic@...ux.vnet.ibm.com>
Acked-by: Jeremy Kerr <jk@...abs.org>
Signed-off-by: Joel Stanley <joel@....id.au>
---
 Documentation/devicetree/bindings/fsi/fsi.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/fsi/fsi.txt b/Documentation/devicetree/bindings/fsi/fsi.txt
index 4eaf488d4015..ab516c673a4b 100644
--- a/Documentation/devicetree/bindings/fsi/fsi.txt
+++ b/Documentation/devicetree/bindings/fsi/fsi.txt
@@ -56,6 +56,13 @@ addresses (link index and slave ID), and no size:
     #address-cells = <2>;
     #size-cells = <0>;
 
+An optional boolean property can be added to indicate that a particular master
+should not scan for connected devices at initialization time.  This is
+necessary in cases where a scan could cause arbitration issues with other
+masters that may be present on the bus.
+
+    no-scan-on-init;
+
 FSI slaves
 ----------
 
-- 
2.15.1