linux-kernel - [PATCH] arm64: dts: ensure backward compatibility of the AP807 Xenon

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Date:   Mon, 22 Mar 2021 01:39:15 +0100
From:   Marcin Wojtas <mw@...ihalf.com>
To:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     andrew@...n.ch, gregory.clement@...tlin.com, robh+dt@...nel.org,
        Marcin Wojtas <mw@...ihalf.com>
Subject: [PATCH] arm64: dts: ensure backward compatibility of the AP807 Xenon

A recent switch to a dedicated AP807 compatible string for the Xenon
SD/MMC controller result in the driver not being probed when
using updated device tree with the older kernel revisions.
It may also be problematic for other OSs/firmware that use
Linux device tree sources as a reference. Resolve the problem
with backward compatibility by restoring a previous compatible
string as secondary one.

Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
---
 arch/arm64/boot/dts/marvell/armada-ap807.dtsi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/marvell/armada-ap807.dtsi b/arch/arm64/boot/dts/marvell/armada-ap807.dtsi
index d9bbbfa4b4eb..4a23f65d475f 100644
--- a/arch/arm64/boot/dts/marvell/armada-ap807.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-ap807.dtsi
@@ -29,6 +29,7 @@ cpu_clk: clock-cpu {
 };
 
 &ap_sdhci0 {
-	compatible = "marvell,armada-ap807-sdhci";
+	compatible = "marvell,armada-ap807-sdhci",
+		     "marvell,armada-ap806-sdhci"; /* Backward compatibility */
 };
 
-- 
2.29.0