Added 1.3ghz overlay for B variant RK3308 (armbian#6348)

Updated and improved RK3308 overlay README doc
Moved rock-s0.wip to .conf

patch/kernel/archive/rockchip64-6.6/overlay/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 dtbo-$(CONFIG_ARCH_ROCKCHIP) += \
-        rk3308-s0-ext-antenna.dtbo \
+	rk3308-s0-ext-antenna.dtbo \
+	[email protected] \
 	rk3308-bs.dtbo [email protected] \
 	rk3308-emmc.dtbo \
 	[email protected] [email protected] \

patch/kernel/archive/rockchip64-6.6/overlay/README.rockchip-overlays

@@ -193,20 +193,28 @@ wifi + bt chip and clones.
 Enable additional cpu "high-speed" bins up to 1.3ghz
 
 **********************************
-Details for Rock Pi-S overlays  (7 Oct 2022):
+Details for Rock Pi-S overlays  (2 Mar 2024):
 
-V1.3 of the RockPi-S uses a the B-S variant of the RK3308 that is optimized
-for lower core voltages than the older chips on the V1.2 and V1.1 boards.
-All V1.3 boards should apply the
+Older V1.1, V1.2, and those V1.3 boards produced during 2022 and 2023
+use a the B-S variant of the RK3308 that is optimized for lower core voltages.
+Per Radxa, these chips will be marked RK3308B-S instead of RK3308B 
+All boards utilizing the RK3308B-S part should apply the:
 ###  rk3308-bs
 overlay to lower the core voltages to reduce power consumption.
 This also enables operation at 1.1Ghz.
 
-Optionally, V1.3 boards may add the
+Optionally, boards utilizing the RK3308B-S parts may add the
 ###  [email protected]
 to overclock the B-S CPU to 1.3Ghz.
 Add the rk3308bs-rock-pi-s-1.3Ghz overlay  *after adding*  rockchip-rk3308bs
 
+According to Radxa, RockPI-S boards manufactured after after 2024 went back
+to the RK3308B.  I have found that many B suffix chips operate fine at the
+lower voltage selected by the rk3308-bs* overlays.  So, when in doubt, try
+the rk3308-bs* overlays first.  If operation is unstable, switch to the
+rk3308-b* overlays.  This will apply the minium CPU voltage necessary for
+your SOC.
+
 ===========
 Install the following overlays only on older (unpatched) mainline kernels:
 
@@ -231,13 +239,19 @@ Note that older mainline kernels cannot drive the SDIO clock faster than 10Mhz.
 
 
 **********************************
-Details for Rock S 0 overlays  (7 Feb 2024):
-
-Note thaat rk3308-bs* overlays crash the s0 for some strange reason
-So, the max CPU clock is currently limited to 1ghz :-(
-(under investigation...)
+Details for Rock S0 overlays  (2 Mar 2024):
 
+By default, the internal WiFi selects its internal chip antenna.
+This antenna is so noisy as to be nearly unusable.
+The external antenna, fortunately, works quite well.
+Install an external WiFi antenna and select it with:
 ###  rk3308-s0-ext-antenna
-Select Rock S0's external WiFi antenna input
-(instead of its internal WiFi antenna)
-The internal antenna is very weak.  Use an external one if convenient.
+
+All Rock S0 boards use the RK3308B chip.
+The:
+###  [email protected]
+overlay enables (overclocked) operation at 1.3ghz
+1.3Ghz operation appears stable on the two boards I've tested.
+
+The legacy kernel is not supported on the Rock S0
+

patch/kernel/archive/rockchip64-6.6/overlay/rk3308-b@1.3ghz.dts

@@ -0,0 +1,27 @@
+//Overclock the Rockchip RK3308-B suffix SOC to 1.3 Ghz
+//  THIS SHOULD NOT BE APPLIED to RK3308-B-S suffix chips
+//  because is will overvolt them
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	fragment@0 {
+		target = <&cpu0_opp_table>;
+		__overlay__ {
+			//the following are unsupported, overclocked operating points
+			opp-1200000000 {
+				opp-hz = /bits/ 64 <1200000000>;
+				opp-microvolt = <1250000 1250000 1340000>;
+				clock-latency-ns = <40000>;
+				status = "okay";
+			};
+			opp-1296000000 {
+				opp-hz = /bits/ 64 <1296000000>;
+				opp-microvolt = <1300000 1300000 1340000>;
+				clock-latency-ns = <40000>;
+				status = "okay";
+			};
+		};
+	};
+};

patch/kernel/archive/rockchip64-6.7/overlay/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 dtbo-$(CONFIG_ARCH_ROCKCHIP) += \
-        rk3308-s0-ext-antenna.dtbo \
+	rk3308-s0-ext-antenna.dtbo \
+	[email protected] \
 	rk3308-bs.dtbo [email protected] \
 	rk3308-emmc.dtbo \
 	[email protected] [email protected] \

patch/kernel/archive/rockchip64-6.7/overlay/README.rockchip-overlays

@@ -193,21 +193,32 @@ wifi + bt chip and clones.
 Enable additional cpu "high-speed" bins up to 1.3ghz
 
 **********************************
-Details for Rock Pi-S overlays  (7 Oct 2022):
+Details for Rock Pi-S overlays  (2 Mar 2024):
 
-V1.3 of the RockPi-S uses a the B-S variant of the RK3308 that is optimized
-for lower core voltages than the older chips on the V1.2 and V1.1 boards.
-All V1.3 boards should apply the
+Older V1.1 and V1.2 boards use the B variant of the RK3308.
+Some V1.3 boards manufactured after October 2023 also use the B variant.
+To overclock the RK3308B, apply:
+###  [email protected]
+
+V1.3 boards produced during 2022 and most of 2023 use the lower voltage
+B-S variant of the RK3308.
+Per Radxa, these chips will be marked RK3308BS instead of RK3308B 
+All boards utilizing the RK3308B-S part should apply the:
 ###  rk3308-bs
-overlay to lower the core voltages to reduce power consumption.
-This also enables operation at 1.1Ghz.
+overlay to operate at the appropriate (lower) the core voltage.
+This overlay also enables operation at 1.1Ghz.
 
-Optionally, V1.3 boards may add the
+Optionally, boards utilizing the RK3308B-S parts may add the
 ###  [email protected]
 to overclock the B-S CPU to 1.3Ghz.
-Add the rk3308bs-rock-pi-s-1.3Ghz overlay  *after adding*  rockchip-rk3308bs
+Apply the [email protected] overlay  *after applying*  rk3308-bs
+
+Applying the *-bs overlays to the B variant of the SOC may result in 
+unstable operation due to undervolting.
+Applying the [email protected] to a BS variant chip consumes more power and
+has the potential to damage the SOC due to overvolting.
 
-===========
+=====  For Older Kernels  ======
 Install the following overlays only on older (unpatched) mainline kernels:
 
 Older mainline kernels disable the Rock Pi S built-in SDNAND (EMMC)
@@ -228,3 +239,20 @@ increases the SDIO clock to only 4Mhz, providing about 1MB/s WiFi throughput.
 use this only if 10Mhz SDIO clock is unstable
 
 Note that older mainline kernels cannot drive the SDIO clock faster than 10Mhz.
+
+
+**********************************
+Details for Rock S0 overlays  (2 Mar 2024):
+
+By default, the internal WiFi uses its internal chip antenna.
+Almost any external antenna will improve WiFi performance over the internal one.
+Install an external WiFi antenna and select it by applying the overlay:
+###  rk3308-s0-ext-antenna
+
+All Rock S0 boards use the RK3308B chip.
+So, applying the overlay:
+###  [email protected]
+enables (overclocked) operation at 1.3ghz
+
+The legacy kernel is not supported on the Rock S0
+

patch/kernel/archive/rockchip64-6.7/overlay/rk3308-b@1.3ghz.dts

@@ -0,0 +1,27 @@
+//Overclock the Rockchip RK3308-B suffix SOC to 1.3 Ghz
+//  THIS SHOULD NOT BE APPLIED to RK3308-B-S suffix chips
+//  because is will overvolt them
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	fragment@0 {
+		target = <&cpu0_opp_table>;
+		__overlay__ {
+			//the following are unsupported, overclocked operating points
+			opp-1200000000 {
+				opp-hz = /bits/ 64 <1200000000>;
+				opp-microvolt = <1250000 1250000 1340000>;
+				clock-latency-ns = <40000>;
+				status = "okay";
+			};
+			opp-1296000000 {
+				opp-hz = /bits/ 64 <1296000000>;
+				opp-microvolt = <1300000 1300000 1340000>;
+				clock-latency-ns = <40000>;
+				status = "okay";
+			};
+		};
+	};
+};