meta-lxatac-bsp: linux-lxatac: upgrade to 6.6

umpf tag is now: 6.6/customers/lxa/lxatac/20231106-1
The tag includes the following topic branches:

  - v6.6/customers/lxa/lxatac
  - v6.6/topic/pwm-stm32
  - v6.6/topic/pwm-backlight
  - v6.6/topic/tty-trigger

Starting with this kernel version the LXA TAC base devicetree is mainline \o/
and we no longer have to add it here as a patch.

The TI LMP92064 buffering support also made it mainline.

Signed-off-by: Leonard Göhrs <[email protected]>

meta-lxatac-bsp/recipes-kernel/linux/files/patches/0003-ARM-dts-stm32-lxa-tac-reduce-RGMII-interface-drive-s.patch

@@ -0,0 +1,31 @@
+From: =?UTF-8?q?Leonard=20G=C3=B6hrs?= <[email protected]>
+Date: Fri, 22 Sep 2023 08:07:26 +0200
+Subject: [PATCH] ARM: dts: stm32: lxa-tac: reduce RGMII interface drive
+ strength
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This results in an improvement of EMI performance by reducing the
+125MHz emission and its harmonics caused by the RGMII clock line.
+
+Signed-off-by: Leonard Göhrs <[email protected]>
+---
+ arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
+index e5dad090551c..c940ea305412 100644
+--- a/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
++++ b/arch/arm/boot/dts/st/stm32mp15xc-lxa-tac.dtsi
+@@ -471,6 +471,10 @@ switch: switch@0 {
+ 		interrupt-parent = <&gpioa>;
+ 		interrupts = <6 IRQ_TYPE_EDGE_RISING>;
+
++		/* Reduce RGMII EMI emissions by reducing drive strength */
++		microchip,hi-drive-strength-microamp = <2000>;
++		microchip,lo-drive-strength-microamp = <8000>;
++
+ 		ports {
+ 			#address-cells = <1>;
+ 			#size-cells = <0>;