feat: Added st7789 pi-1.14-lcd

[sschueller]

This ads an overlay for the 1.14" pi hat like this one: https://www.aliexpress.com/item/1005001685753066.html

Works under Radxa ZERO 3 Debian Build 6 and Armbian distro

To use it under Armbian:

apt-get git build-dep --no-install-recommends -y .
git clone https://github.com/radxa-pkg/radxa-overlays.git
cd radxa-overlays
make all deb
make build-dtbo -j$(nproc) KERNELRELEASE=$(uname -r) CONFIG_CPU_RK3568=rockchip
mkdir -p /boot/overlay/
cp arch/arm64/boot/dts/rockchip/overlays/radxa-zero3-mini-pi-1.14-lcd-hat.dtbo /boot/overlay/
fdtoverlay -v -i /boot/dtb/rockchip/rk3566-radxa-zero3.dtb -o /boot/dtb/rockchip/rk3566-radxa-zero3-patched.dtb /boot/overlay/radxa-zero3-mini-pi-1.14-lcd-hat.dtbo

Edit your /boot/armbianEnv.txt

...
overlay_prefix=rk35xx
fdtfile=rockchip/rk3566-radxa-zero3-patched.dtb
...

Reboot

For the 135x240 to work with the correct offset the driver needs to be patched as well to support offsets:

apt install -y linux-source build-dep
tar -xf /usr/src/linux-source-*.tar.xz
cd linux-source-*/drivers/staging/fbtft/
git apply fb_st7789v.c.patch # patch with changes as file below
make -C /lib/modules/$(uname -r)/build M=$(pwd) fb_st7789v.ko
mv /usr/lib/modules/$(uname -r)/kernel/drivers/staging/fbtft/fb_st7789v.ko /usr/lib/modules/$(uname -r)/kernel/drivers/staging/fbtft/fb_st7789v.ko-old
cp fb_st7789v.ko /usr/lib/modules/$(uname -r)/kernel/drivers/staging/fbtft/.
reboot

fb_st7789v.c.patch

--- fb_st7789v-orig.c	2025-07-05 15:07:25.608286257 +0200
+++ fb_st7789v.c	2025-07-05 15:07:25.608286257 +0200
@@ -13,7 +13,7 @@
 #include <linux/interrupt.h>
 #include <linux/completion.h>
 #include <linux/module.h>
-
+#include <linux/moduleparam.h>
 #include <video/mipi_display.h>
 
 #include "fbtft.h"
@@ -30,6 +30,13 @@
 
 #define HSD20_IPS 1
 
+static int x_offset = 0;
+static int y_offset = 0;
+module_param(x_offset, int, 0444);
+MODULE_PARM_DESC(x_offset, "X offset of the display");
+module_param(y_offset, int, 0444);
+MODULE_PARM_DESC(y_offset, "Y offset of the display");
+
 /**
  * enum st7789v_command - ST7789V display controller commands
  *
@@ -142,6 +149,13 @@
  */
 static int init_display(struct fbtft_par *par)
 {
+	struct device *dev = par->info->device;
+
+	if (dev->of_node) {
+		of_property_read_u32(dev->of_node, "x-offset", &x_offset);
+		of_property_read_u32(dev->of_node, "y-offset", &y_offset);
+	}
+
 	int rc;
 
 	par->fbtftops.reset(par);
@@ -294,6 +308,33 @@
 }
 
 /**
+ * set_addr_win() - set the address window with optional offsets
+ *
+ * @par: FBTFT parameter object
+ * @xs: x start
+ * @ys: y start
+ * @xe: x end
+ * @ye: y end
+ */
+static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
+{
+	xs += x_offset;
+	xe += x_offset;
+	ys += y_offset;
+	ye += y_offset;
+
+	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
+		  (xs >> 8) & 0xFF, xs & 0xFF,
+		  (xe >> 8) & 0xFF, xe & 0xFF);
+
+	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
+		  (ys >> 8) & 0xFF, ys & 0xFF,
+		  (ye >> 8) & 0xFF, ye & 0xFF);
+
+	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
+}
+
+/**
  * set_gamma() - set gamma curves
  *
  * @par: FBTFT parameter object
@@ -379,6 +420,7 @@
 		.set_var = set_var,
 		.set_gamma = set_gamma,
 		.blank = blank,
+		.set_addr_win = set_addr_win,
 	},
 };
 
@@ -389,6 +431,6 @@
 MODULE_ALIAS("spi:st7789v");
 MODULE_ALIAS("platform:st7789v");
 
-MODULE_DESCRIPTION("FB driver for the ST7789V LCD Controller");
+MODULE_DESCRIPTION("FB driver for the ST7789V LCD Controller with offset");
 MODULE_AUTHOR("Dennis Menschel");
 MODULE_LICENSE("GPL");
\ No newline at end of file

[RadxaYuntian]

LGTM. Please squash your commits.

[sschueller]

LGTM. Please squash your commits.

Thanks, isn't that an option when merging?

[RadxaYuntian]

Not when you enabled merge queue, which it will only use the preconfigured action.

[RadxaYuntian]

CI reports build error.

[RadxaYuntian]

Suggested change