[PATCH v4 08/19] arm64: dts: mediatek: mt8192: Add mfg_ref_sel clock to MFG0 domain

[AngeloGioacchino Del Regno]

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 at collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst at chromium.org>
---
 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 34631adc52c6..a29cdff8a095 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
@@ -499,8 +499,9 @@ power-domain at MT8192_POWER_DOMAIN_CONN {
 
 				power-domain at MT8192_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>;
-- 
2.39.2