There are patches to enable "allwinner,simple-framebuffer" with "mixer0-lcd0" pipeline for V3s.
First patch updates V3s dts(i) from Linux-v5.9. Second patch enable simple-framebuffer in V3s dtsi (planed merge in Linux-v5.11) Third patch enable PWM0 (for backlight support). Fourth patch is the main extension to code and build: - V3s has 2x VI and 1x UI channels (use UI channel), so use third channel. - V3s uses PLL3 (PLL_VIDEO) for both DE2 and TCON0 pixelclock. PLL10 is used for DDR2. PLL3 does not support doubleclock. - V3s supports resolution upto 1024x1024. Also scale down memory requirements for V3s (64MB embedded DDR2) - V3s does not support HDMI. Fifth patch enable PWM drivers and corrects CONFIG_VIDEO_LCD_DCLK_PHASE.
Tested with "Lichee Zero" V3s and 800x600 LCD (not configured DRM DE2/TCON0/panel in linux DTS). To enable functionality see TESTING patch at - https://github.com/mcerveny/u-boot/tree/simplefb_v3s_v2
Changes since v1: - problematic patch for generic DE2 suppress of doubleclock search was redesigned for V3s only - changes dts(i) was synced from Linux-v5.9 and additional patch to enable simple-framebuffer
Martin Cerveny (5): ARM: dts: sun8i: Update V3s dts(i) files from Linux-v5.9 ARM: dts: sun8i: v3s: Add simple-framebuffer pwm: sunxi: v3s: Enable PWM0 sunxi: video: v3s: Enable LCD support sunxi: add drivers and configs needed for LCD display
arch/arm/dts/sun8i-v3s-licheepi-zero.dts | 26 ++- arch/arm/dts/sun8i-v3s.dtsi | 216 +++++++++++++++--- arch/arm/include/asm/arch-sunxi/clock_sun6i.h | 5 +- arch/arm/include/asm/arch-sunxi/gpio.h | 2 + arch/arm/mach-sunxi/Kconfig | 1 + configs/LicheePi_Zero_defconfig | 4 + drivers/pwm/sunxi_pwm.c | 3 + drivers/video/sunxi/lcdc.c | 5 +- drivers/video/sunxi/sunxi_de2.c | 25 +- drivers/video/sunxi/sunxi_dw_hdmi.c | 2 + drivers/video/sunxi/sunxi_lcd.c | 9 +- 11 files changed, 260 insertions(+), 38 deletions(-)