linux-kernel - [RFC 01/13] dt-bindings: Introduce 64bit-mmio-broken

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Date:   Fri, 26 Feb 2021 15:02:53 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     f.fainelli@...il.com, robh+dt@...nel.org, robin.murphy@....com,
        ardb@...nel.org, hch@...radead.org, narmstrong@...libre.com,
        dwmw2@...radead.org, linux@...linux.org.uk,
        catalin.marinas@....com, arnd@...db.de, will@...nel.org,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: [RFC 01/13] dt-bindings: Introduce 64bit-mmio-broken

Some buses might not be able to handle 64-bit sized MMIO accesses, on
otherwise 64-bit systems. Introduce a boolean property to cater for this
limitation.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 .../devicetree/bindings/common-properties.txt     | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/devicetree/bindings/common-properties.txt b/Documentation/devicetree/bindings/common-properties.txt
index 98a28130e100..3783510102c3 100644
--- a/Documentation/devicetree/bindings/common-properties.txt
+++ b/Documentation/devicetree/bindings/common-properties.txt
@@ -83,3 +83,18 @@ gpio@0 {
 	      #gpio-cells = <2>;
 	      #daisy-chained-devices = <3>;
 };
+
+Broken 64-bit buses
+-------------------
+
+Some buses might not be able to handle 64-bit sized MMIO accesses, on otherwise
+64-bit systems. This property is only relevant to MMIO bus nodes.
+
+Optional properties:
+ - 64bit-mmio-broken: Boolean
+
+Example:
+pcie@0 {
+	compatible = "name";
+	64bit-mmio-broken;
+};
-- 
2.30.1