linux-kernel - [PATCH V3 1/5] dt-bindings: mailbox: allow mbox-cells to be equal to 0

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Date:   Fri, 22 Jun 2018 22:11:56 +0800
From:   Dong Aisheng <aisheng.dong@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     dongas86@...il.com, kernel@...gutronix.de, shawnguo@...nel.org,
        fabio.estevam@....com, linux-imx@....com,
        Dong Aisheng <aisheng.dong@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V3 1/5] dt-bindings: mailbox: allow mbox-cells to be equal to 0

Mailbox devices may have only one channel which means the mbox-cells
at least 1 does not make sense for this type devices. Let's remove
that limitation to allow the mbox-cells to be equal to 0.

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
---
ChangeLog:
 * New patch introduced in v3 series
 * Actually there're already users in kernel with mbox-cells set to 0.
   See:
   arch/arm/boot/dts/bcm283x.dtsi:145: #mbox-cells = <0>;
---
 Documentation/devicetree/bindings/mailbox/mailbox.txt | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mailbox/mailbox.txt b/Documentation/devicetree/bindings/mailbox/mailbox.txt
index af8ecee..c2fcd05 100644
--- a/Documentation/devicetree/bindings/mailbox/mailbox.txt
+++ b/Documentation/devicetree/bindings/mailbox/mailbox.txt
@@ -6,8 +6,7 @@ assign appropriate mailbox channel to client drivers.
 * Mailbox Controller
 
 Required property:
-- #mbox-cells: Must be at least 1. Number of cells in a mailbox
-		specifier.
+- #mbox-cells: Number of cells in a mailbox specifier.
 
 Example:
 	mailbox: mailbox {
-- 
2.7.4