MilkV st7735 buildroot patch

st7735.patch

From 72b54c40a8f0b618d54f9ca32c05b2e9f9f650d2 Mon Sep 17 00:00:00 2001
From: Your Name <[email protected]>
Date: Mon, 13 Jan 2025 20:35:18 +0000
Subject: [PATCH] st7735 patch

---
 .../dts_riscv/cv1813h_milkv_duos_sd.dts       | 17 ++++++-
 .../cvitek_cv1813h_milkv_duos_sd_defconfig    |  2 +
 .../milkv-duos-sd_musl_riscv64_defconfig      |  5 +-
 linux_5.10/drivers/staging/fbtft/fbtft-core.c | 46 ++++++++++++++-----
 4 files changed, 56 insertions(+), 14 deletions(-)

diff --git a/build/boards/cv181x/cv1813h_milkv_duos_sd/dts_riscv/cv1813h_milkv_duos_sd.dts b/build/boards/cv181x/cv1813h_milkv_duos_sd/dts_riscv/cv1813h_milkv_duos_sd.dts
index 1ea1d4632..46f161273 100644
--- a/build/boards/cv181x/cv1813h_milkv_duos_sd/dts_riscv/cv1813h_milkv_duos_sd.dts
+++ b/build/boards/cv181x/cv1813h_milkv_duos_sd/dts_riscv/cv1813h_milkv_duos_sd.dts
@@ -43,9 +43,24 @@
 
 &spi3 {
 	status = "okay";
+	/delete-node/ spidev@0;
 
-	spidev@0 {
+	st7735r: st7735r@0{
+		compatible = "sitronix,st7735r";
+		reg = <0>;
 		status = "okay";
+		spi-max-frequency = <48000000>;
+		spi-cpol;
+		spi-cpha;
+		rotate = <0>;
+		fps = <60>;
+		rgb;
+		buswidth = <8>;
+
+		dc = <&porta 18 GPIO_ACTIVE_HIGH>;
+		reset = <&porta 28 GPIO_ACTIVE_HIGH>;
+
+		debug = <0x0>;
 	};
 };
 
diff --git a/build/boards/cv181x/cv1813h_milkv_duos_sd/linux/cvitek_cv1813h_milkv_duos_sd_defconfig b/build/boards/cv181x/cv1813h_milkv_duos_sd/linux/cvitek_cv1813h_milkv_duos_sd_defconfig
index 3003163a0..1d5f0d00b 100644
--- a/build/boards/cv181x/cv1813h_milkv_duos_sd/linux/cvitek_cv1813h_milkv_duos_sd_defconfig
+++ b/build/boards/cv181x/cv1813h_milkv_duos_sd/linux/cvitek_cv1813h_milkv_duos_sd_defconfig
@@ -165,6 +165,8 @@ CONFIG_WATCHDOG=y
 CONFIG_FB=y
 CONFIG_FB_SIMPLE=y
 CONFIG_FB_CVITEK=m
+CONFIG_FB_TFT=y
+CONFIG_FB_TFT_ST7735R=y
 CONFIG_SOUND=y
 CONFIG_SND=y
 # CONFIG_SND_SUPPORT_OLD_API is not set
diff --git a/buildroot-2021.05/configs/milkv-duos-sd_musl_riscv64_defconfig b/buildroot-2021.05/configs/milkv-duos-sd_musl_riscv64_defconfig
index dcafbf2bb..357e1b358 100644
--- a/buildroot-2021.05/configs/milkv-duos-sd_musl_riscv64_defconfig
+++ b/buildroot-2021.05/configs/milkv-duos-sd_musl_riscv64_defconfig
@@ -36,6 +36,10 @@ BR2_PACKAGE_STRESS_NG=y
 BR2_PACKAGE_TREE=y
 BR2_PACKAGE_E2FSPROGS=y
 BR2_PACKAGE_E2FSPROGS_RESIZE2FS=y
+BR2_PACKAGE_FB_TEST_APP=y
+BR2_PACKAGE_FBSET=y
+BR2_PACKAGE_FBTERM=y
+BR2_PACKAGE_FBV=y
 BR2_PACKAGE_EVTEST=y
 BR2_PACKAGE_I2C_TOOLS=y
 BR2_PACKAGE_PARTED=y
@@ -57,7 +61,6 @@ BR2_PACKAGE_PYTHON_SPIDEV=y
 BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_LIBOPENSSL_BIN=y
 BR2_PACKAGE_LIBOPENSSL_ENGINES=y
-BR2_PACKAGE_FREETYPE=y
 BR2_PACKAGE_C_PERIPHERY=y
 BR2_PACKAGE_LIBUSB=y
 BR2_PACKAGE_LIBUSB_EXAMPLES=y
diff --git a/linux_5.10/drivers/staging/fbtft/fbtft-core.c b/linux_5.10/drivers/staging/fbtft/fbtft-core.c
index 4f362dad4..2576046ac 100644
--- a/linux_5.10/drivers/staging/fbtft/fbtft-core.c
+++ b/linux_5.10/drivers/staging/fbtft/fbtft-core.c
@@ -27,6 +27,9 @@
 
 #include <video/mipi_display.h>
 
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+
 #include "fbtft.h"
 #include "internal.h"
 
@@ -72,22 +75,39 @@ void fbtft_dbg_hex(const struct device *dev, int groupsize,
 EXPORT_SYMBOL(fbtft_dbg_hex);
 
 static int fbtft_request_one_gpio(struct fbtft_par *par,
-				  const char *name, int index,
-				  struct gpio_desc **gpiop)
+                  const char *name, int index,
+                  struct gpio_desc **gpiop)
 {
 	struct device *dev = par->info->device;
-	int ret = 0;
+	struct device_node *node = dev->of_node;
+	int gpio, flags, ret = 0;
+	enum of_gpio_flags of_flags;
 
-	*gpiop = devm_gpiod_get_index_optional(dev, name, index,
-					       GPIOD_OUT_HIGH);
-	if (IS_ERR(*gpiop)) {
-		ret = PTR_ERR(*gpiop);
-		dev_err(dev,
-			"Failed to request %s GPIO: %d\n", name, ret);
-		return ret;
+	if (of_find_property(node, name, NULL)) {
+		gpio = of_get_named_gpio_flags(node, name, index, &of_flags);
+		if (gpio == -ENOENT)
+			return 0;
+		if (gpio == -EPROBE_DEFER)
+			return gpio;
+		if (gpio < 0) {
+			dev_err(dev, "failed to get '%s' from DT\n", name);
+			return gpio;
+		}
+
+		//active low translates to initially low
+		flags = (of_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
+		ret = devm_gpio_request_one(dev, gpio, flags, dev->driver->name);
+		if (ret) {
+			dev_err(dev,
+				"gpio_request_one('%s'=%d) failed with %d\n",
+				name, gpio, ret);
+			return ret;
+		}
+
+		*gpiop = gpio_to_desc(gpio);
+		fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' = GPIO%d\n",
+						__func__, name, gpio);
 	}
-	fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
-		      __func__, name);
 
 	return ret;
 }
@@ -231,6 +251,8 @@ static void fbtft_reset(struct fbtft_par *par)
 	usleep_range(20, 40);
 	gpiod_set_value_cansleep(par->gpio.reset, 0);
 	msleep(120);
+	gpiod_set_value_cansleep(par->gpio.reset, 1);
+	msleep(10);
 }
 
 static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
-- 
2.34.1

Test with executing fb-test