linux-kernel - [PATCH 08/16] arm64: dts: mediatek: mt8192: Add mfg_ref

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Date:   Wed,  8 Feb 2023 11:45:19 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        angelogioacchino.delregno@...labora.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: [PATCH 08/16] arm64: dts: mediatek: mt8192: Add mfg_ref_sel clock to MFG0 domain

The mfg_ref_sel clock is a mux used to switch between different "safe"
(and slower) clock sources for the GPU: this is used during MFGPLL
reconfiguration and eventually during idling at very low frequencies.

This clock getting turned off means that the GPU will occasionally be
unclocked, producing obvious consequences such as system crash or
unpredictable behavior: assigning it to the top level MFG power domain
will make sure that this stays on at all times during any operation on
the MFG domain (only GPU-related transactions).

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt8192.dtsi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
index a60120088d45..5b4bf2d1d584 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
@@ -499,8 +499,9 @@ power-domain@...192_POWER_DOMAIN_CONN {
 
 				power-domain@...192_POWER_DOMAIN_MFG0 {
 					reg = <MT8192_POWER_DOMAIN_MFG0>;
-					clocks = <&topckgen CLK_TOP_MFG_PLL_SEL>;
-					clock-names = "mfg";
+					clocks = <&topckgen CLK_TOP_MFG_PLL_SEL>,
+						 <&topckgen CLK_TOP_MFG_REF_SEL>;
+					clock-names = "mfg", "alt";
 					#address-cells = <1>;
 					#size-cells = <0>;
 					#power-domain-cells = <1>;
-- 
2.39.1