linux-kernel - [PATCH v1 08/25] dt-bindings: clock: mt8173: Add dummy clock ID

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Date:   Thu, 22 Dec 2022 12:48:40 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     mturquette@...libre.com
Cc:     sboyd@...nel.org, matthias.bgg@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        angelogioacchino.delregno@...labora.com, wenst@...omium.org,
        johnson.wang@...iatek.com, miles.chen@...iatek.com,
        fparent@...libre.com, chun-jie.chen@...iatek.com,
        sam.shih@...iatek.com, y.oudjana@...tonmail.com,
        nfraprado@...labora.com, rex-bc.chen@...iatek.com,
        ryder.lee@...nel.org, daniel@...rotopia.org,
        jose.exposito89@...il.com, yangyingliang@...wei.com,
        pablo.sun@...iatek.com, msp@...libre.com, weiyi.lu@...iatek.com,
        ikjn@...omium.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        kernel@...labora.com
Subject: [PATCH v1 08/25] dt-bindings: clock: mt8173: Add dummy clock ID

Some old MediaTek clock drivers are starting the clock count (so, the
clock ID) from one instead of zero and this is logically incorrect,
as we should start from 0.
During a cleanup an issue emerged due to that and the cleanest and
shortest way to keep devicetree backwards compatibility while still
performing the well deserved cleanup is to add a dummy clock where
needed, with ID 0.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 include/dt-bindings/clock/mt8173-clk.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/dt-bindings/clock/mt8173-clk.h b/include/dt-bindings/clock/mt8173-clk.h
index 3d00c98b9654..86c298e8eb89 100644
--- a/include/dt-bindings/clock/mt8173-clk.h
+++ b/include/dt-bindings/clock/mt8173-clk.h
@@ -7,6 +7,9 @@
 #ifndef _DT_BINDINGS_CLK_MT8173_H
 #define _DT_BINDINGS_CLK_MT8173_H
 
+/* Dummy clock for backwards compatibility */
+#define CLK_DUMMY			0
+
 /* TOPCKGEN */
 
 #define CLK_TOP_CLKPH_MCK_O		1
-- 
2.39.0