linux-kernel - [PATCH v1 03/18] arm64: dts: mediatek: mt6795: xperia-m5: Enable Frequency Hopping

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Message-Id: <20230324175456.219954-4-angelogioacchino.delregno@collabora.com>
Date:   Fri, 24 Mar 2023 18:54:41 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     qii.wang@...iatek.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, jassisinghbrar@...il.com,
        houlong.wei@...iatek.com, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, kernel@...labora.com,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH v1 03/18] arm64: dts: mediatek: mt6795: xperia-m5: Enable Frequency Hopping

Enable FHCTL with Spread Spectrum for MAINPLL, MPLL and MSDCPLL
as found on the downstream kernel for this smartphone.
Which one to enable, and at what SSC percentage, was found by
dumping the debugging data from a running downstream kernel and
checking the downstream code.

/proc/freqhopping # cat status
FH status:
===============================================
id == fh_status == pll_status == setting_id == curr_freq == user_defined
 0           0             1             0      1599000         0
 1           0             1             0      1716000         0
 2           1             1             2      1092000         0
 3           1             1             2      2912000         0
 4           1             0             2      1600000         0
 5           0             0             0            0         0
 6           0             1             0      1518002         0
 7           0             0             0            0         0
 8           0             0             0            0         0

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts b/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts
index d3415527d389..52ce3284a46f 100644
--- a/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts
+++ b/arch/arm64/boot/dts/mediatek/mt6795-sony-xperia-m5.dts
@@ -48,6 +48,13 @@ bootloader-region@...00000 {
 	};
 };
 
+&fhctl {
+	clocks = <&apmixedsys CLK_APMIXED_MAINPLL>, <&apmixedsys CLK_APMIXED_MPLL>,
+		 <&apmixedsys CLK_APMIXED_MSDCPLL>;
+	mediatek,hopping-ssc-percent = <8>, <5>, <8>;
+	status = "okay";
+};
+
 &pio {
 	uart0_pins: uart0-pins {
 		pins-rx {
-- 
2.40.0