linux-purism-librem5: Add 166MHz to DDRC OPP table (MR 3754)

Backport the Purism patch from https://source.puri.sm/Librem5/linux/-/merge_requests/640



"With this patch, older revisions (2.0) should be able to switch between
166MHz and 800MHz as opposed to being stuck to 800MHz all the time, since
that was the only supported frequency in the OPP table."

Signed-off-by: Alistair Francis <alistair@alistair23.me>

[ci:skip-build] already built successfully in CI

device/main/linux-purism-librem5/0001-dts-imx8mq-librem5-Add-166MHz-to-DDRC-OPP-table.patch

+From c78892e4d8d30370430acc1bca24685f4d223b76 Mon Sep 17 00:00:00 2001
+From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
+Date: Thu, 15 Dec 2022 17:47:28 +0100
+Subject: [PATCH] dts: imx8mq-librem5: Add 166MHz to DDRC OPP table
+
+This is the lowest frequency supported by older iMX8MQ SoC
+revisions.
+---
+ arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+index cebbbb81648d..a699dcfba372 100644
+--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
++++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+@@ -452,6 +452,10 @@ opp-100M {
+ 			opp-hz = /bits/ 64 <100000000>;
+ 		};
+ 
++		opp-166M {
++			opp-hz = /bits/ 64 <166935483>;
++		};
++
+ 		opp-800M {
+ 			opp-hz = /bits/ 64 <800000000>;
+ 		};
+-- 
+2.38.1
+

device/main/linux-purism-librem5/APKBUILD

@@ -3,7 +3,7 @@
 # Co-Maintainer: Alistair Francis <alistair@alistair23.me>
 pkgname=linux-purism-librem5
 pkgver=6.1.0
-pkgrel=0
+pkgrel=1
 _purismrel=1
 # <kernel ver>.<purism kernel release>
 _purismver=${pkgver}pureos$_purismrel
@@ -39,6 +39,7 @@ _config="config-$_flavor.$arch"
 
 source="
 	$pkgname-$_purismver.tar.gz::https://source.puri.sm/Librem5/linux/-/archive/pureos/$_purismver/linux-pureos-$_purismver.tar.gz
+	0001-dts-imx8mq-librem5-Add-166MHz-to-DDRC-OPP-table.patch
 	$_config
 "
 builddir="$srcdir/$_repository-pureos-$_purismver"
@@ -72,5 +73,6 @@ package() {
 
 sha512sums="
 120ac18a0b93c302062578b3b80ef0d18f351be94b6b89322b25b4fdce416261ef311a327acd42718741db5e1d5516d45109fc7ef8ef338f6af6dfb78cf2beb1  linux-purism-librem5-6.1.0pureos1.tar.gz
+fef3f0dad3a039a3e419c209d9cecc21f4767fe2150b8c5dcf5d70d0c00ee62cf45f71d5f24ef2f88311ca7d63356a5be6399837682e66531be88005c882e629  0001-dts-imx8mq-librem5-Add-166MHz-to-DDRC-OPP-table.patch
 18826512ca9b78d61bda5d892afa31404dccc4be4492ff9a29e69d8c68edebc2ed0c470d6fe8d577f3840a5db0f79221e55ee334dd9b841d2cfd0a2ebe59c22a  config-purism-librem5.aarch64
 "