[PATCH] add drm panel driver for stm32f429-dicovery board the change details:

* [PATCH] add drm panel driver for stm32f429-dicovery board the change details:
@ 2020-04-30  8:07 ` dillon.minfei
  0 siblings, 0 replies; 6+ messages in thread
From: dillon.minfei @ 2020-04-30  8:07 UTC (permalink / raw)
  To: mcoquelin.stm32
  Cc: sam, airlied, daniel, robh+dt, dri-devel, devicetree,
	linux-kernel, alexandre.torgue, linux-stm32, linux-arm-kernel,
	mturquette, sboyd, thierry.reding, broonie, p.zabel, dillon.min,
	dillonhua, dillon min

From: dillon min <dillon.minfei@gmail.com>

1) add support drm ili9341 panel driver connect to ltdc

2) add i2c3/spi5 ltdc pins dts configuration for gyro/stmpe

3) add SPI_SIMPLEX_RX/SPI_3WIRE_RX in spi-stm32f4.c
   for SPI_SIMPLEX_RX , as we running kernel in sdram, so
   that the performance is not as good as internal flash,
   need add send dummy data out while in rx,
   otherwise will get many overrun errors.

4) fix hang bugs durning ltdc driver load , in clk-stm32f4.c
   store clk_hw to the wrong offset PLL_VCO_SAI, PLL_VCO_I2S

5) add CLK_IGNORE_UNUSED for ltdc, otherwise system will close
   ltdc clk

=======================

Signed-off-by: dillon min <dillon.minfei@gmail.com>
---
 .../bindings/display/panel/ilitek,ili9341.txt      |  43 ++
 arch/arm/boot/dts/stm32f4-pinctrl.dtsi             |  79 +++
 arch/arm/boot/dts/stm32f429-disco.dts              |  88 ++++
 arch/arm/boot/dts/stm32f429.dtsi                   |  12 +
 drivers/clk/clk-stm32f4.c                          |   7 +-
 drivers/gpu/drm/panel/Kconfig                      |   8 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-ilitek-ili9341.c       | 561 +++++++++++++++++++++
 drivers/spi/spi-stm32.c                            |  26 +-
 9 files changed, 818 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
 create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c

diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt b/Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
new file mode 100644
index 0000000..a03825f
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
@@ -0,0 +1,43 @@
+Ilitek ILI9341 TFT panel driver with SPI control bus
+
+This is a driver for 320x240 TFT panels, accepting a rgb input
+streams that get adapted and scaled to the panel.
+VCOMH outputs.
+
+Required properties:
+  - compatible: "stm32f429-disco,ltdc-panel", "ilitek,ili9341"
+    (full system-specific compatible is always required to look up configuration)
+  - reg: address of the panel on the SPI bus
+
+Optional properties:
+  - reset-gpios: a GPIO spec for the reset pin, see gpio/gpio.txt
+  - dc-gpios: a GPIO spec for the dc pin, see gpio/gpio.txt
+
+  The following optional properties only apply to RGB input mode:
+
+  - pixelclk-active: see display/panel/display-timing.txt
+  - de-active: see display/panel/display-timing.txt
+  - hsync-active: see display/panel/display-timing.txt
+  - vsync-active: see display/panel/display-timing.txt
+
+The panel must obey the rules for a SPI slave device as specified in
+spi/spi-bus.txt
+
+The device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in
+media/video-interfaces.txt. This node should describe panel's video bus.
+
+Example:
+
+panel: display@0 {
+	compatible = "stm32f429-disco,ltdc-panel", "ilitek,ili9341";
+	reg = <0>;
+	spi-3wire;
+	spi-max-frequency = <10000000>;
+	dc-gpios = <&gpiod 13 0>;
+	port {
+		panel_in: endpoint {
+			remote-endpoint = <&display_out>;
+		};
+	};
+};
diff --git a/arch/arm/boot/dts/stm32f4-pinctrl.dtsi b/arch/arm/boot/dts/stm32f4-pinctrl.dtsi
index 392fa14..45b68f4 100644
--- a/arch/arm/boot/dts/stm32f4-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32f4-pinctrl.dtsi
@@ -316,6 +316,85 @@
 				};
 			};
 
+			ltdc_pins_f429_disco: ltdc-1 {
+				pins {
+					pinmux = <STM32_PINMUX('C', 6,  AF14)>,
+						/* LCD_HSYNC */
+						 <STM32_PINMUX('A', 4,  AF14)>,
+						 /* LCD_VSYNC */
+						 <STM32_PINMUX('G', 7,  AF14)>,
+						 /* LCD_CLK */
+						 <STM32_PINMUX('C', 10, AF14)>,
+						 /* LCD_R2 */
+						 <STM32_PINMUX('B', 0,  AF9)>,
+						 /* LCD_R3 */
+						 <STM32_PINMUX('A', 11, AF14)>,
+						 /* LCD_R4 */
+						 <STM32_PINMUX('A', 12, AF14)>,
+						 /* LCD_R5 */
+						 <STM32_PINMUX('B', 1,  AF9)>,
+						 /* LCD_R6*/
+						 <STM32_PINMUX('G', 6,  AF14)>,
+						 /* LCD_R7 */
+						 <STM32_PINMUX('A', 6,  AF14)>,
+						 /* LCD_G2 */
+						 <STM32_PINMUX('G', 10, AF9)>,
+						 /* LCD_G3 */
+						 <STM32_PINMUX('B', 10, AF14)>,
+						 /* LCD_G4 */
+						 <STM32_PINMUX('D', 6,  AF14)>,
+						 /* LCD_B2 */
+						 <STM32_PINMUX('G', 11, AF14)>,
+						 /* LCD_B3*/
+						 <STM32_PINMUX('B', 11, AF14)>,
+						 /* LCD_G5 */
+						 <STM32_PINMUX('C', 7,  AF14)>,
+						 /* LCD_G6 */
+						 <STM32_PINMUX('D', 3,  AF14)>,
+						 /* LCD_G7 */
+						 <STM32_PINMUX('G', 12, AF9)>,
+						 /* LCD_B4 */
+						 <STM32_PINMUX('A', 3,  AF14)>,
+						 /* LCD_B5 */
+						 <STM32_PINMUX('B', 8,  AF14)>,
+						 /* LCD_B6 */
+						 <STM32_PINMUX('B', 9,  AF14)>,
+						 /* LCD_B7 */
+						 <STM32_PINMUX('F', 10, AF14)>;
+						 /* LCD_DE */
+					slew-rate = <2>;
+				};
+			};
+
+			i2c3_pins: i2c3-0 {
+				pins {
+					pinmux = <STM32_PINMUX('C', 9, AF4)>,
+						/* I2C3_SDA */
+						 <STM32_PINMUX('A', 8, AF4)>;
+						/* I2C3_SCL */
+					bias-disable;
+					drive-open-drain;
+					slew-rate = <3>;
+				};
+			};
+
+			spi5_pins: spi5-0 {
+				pins1 {
+					pinmux = <STM32_PINMUX('F', 7, AF5)>,
+						/* SPI5_CLK */
+						 <STM32_PINMUX('F', 9, AF5)>;
+						/* SPI5_MOSI */
+					bias-disable;
+					drive-push-pull;
+					slew-rate = <0>;
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('F', 8, AF5)>;
+						/* SPI5_MISO */
+					bias-disable;
+				};
+			};
+
 			dcmi_pins: dcmi-0 {
 				pins {
 					pinmux = <STM32_PINMUX('A', 4, AF13)>, /* DCMI_HSYNC */
diff --git a/arch/arm/boot/dts/stm32f429-disco.dts b/arch/arm/boot/dts/stm32f429-disco.dts
index 30c0f67..55eed05 100644
--- a/arch/arm/boot/dts/stm32f429-disco.dts
+++ b/arch/arm/boot/dts/stm32f429-disco.dts
@@ -49,6 +49,8 @@
 #include "stm32f429.dtsi"
 #include "stm32f429-pinctrl.dtsi"
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "STMicroelectronics STM32F429i-DISCO board";
@@ -98,6 +100,14 @@
 		regulator-name = "vcc5_host1";
 		regulator-always-on;
 	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "3P3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+	};
 };
 
 &clk_hse {
@@ -127,3 +137,81 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&ltdc {
+	status = "okay";
+	pinctrl-0 = <&ltdc_pins_f429_disco>;
+	pinctrl-names = "default";
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
+};
+
+&spi5 {
+	status = "okay";
+	pinctrl-0 = <&spi5_pins>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	cs-gpios = <&gpioc 1 GPIO_ACTIVE_LOW>,<&gpioc 2 GPIO_ACTIVE_LOW>;
+	dmas = <&dma2 3 2 0x400 0x0>,
+	       <&dma2 4 2 0x400 0x0>;
+	dma-names = "rx", "tx";
+	l3gd20: l3gd20@0 {
+		compatible = "st,l3gd20-gyro";
+		spi-max-frequency = <10000000>;
+		st,drdy-int-pin = <2>;
+		interrupt-parent = <&gpioa>;
+		interrupts = <1 IRQ_TYPE_EDGE_RISING>,
+				<2 IRQ_TYPE_EDGE_RISING>;
+		reg = <0>;
+		vddio = <&reg_3p3v>;
+		vdd = <&reg_3p3v>;
+		status = "okay";
+	};
+	display: display@1{
+		/* Connect panel-ilitek-9341 to ltdc */
+		compatible = "stm32f429-disco,ltdc-panel", "ilitek,ili9341";
+		reg = <1>;
+		spi-3wire;
+		spi-max-frequency = <10000000>;
+		dc-gpios = <&gpiod 13 0>;
+		port {
+			panel_in_rgb: endpoint {
+			remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
+};
+
+&i2c3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
+	status = "okay";
+
+	touch: stmpe811@41 {
+		compatible = "st,stmpe811";
+		reg = <0x41>;
+		interrupts = <15 IRQ_TYPE_EDGE_FALLING>;
+		interrupt-parent = <&gpioa>;
+		vio = <&reg_3p3v>;
+		vcc = <&reg_3p3v>;
+		status = "okay";
+
+		stmpe_touchscreen {
+			compatible = "st,stmpe-ts";
+			st,sample-time = <4>;
+			st,mod-12b = <1>;
+			st,ref-sel = <0>;
+			st,adc-freq = <1>;
+			st,ave-ctrl = <1>;
+			st,touch-det-delay = <2>;
+			st,settling = <2>;
+			st,fraction-z = <7>;
+			st,i-drive = <1>;
+		};
+	};
+};
diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index d777069..257b843 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -402,6 +402,18 @@
 			status = "disabled";
 		};
 
+		i2c3: i2c@40005c00 {
+			compatible = "st,stm32f4-i2c";
+			reg = <0x40005c00 0x400>;
+			interrupts = <72>,
+				     <73>;
+			resets = <&rcc STM32F4_APB1_RESET(I2C3)>;
+			clocks = <&rcc 0 STM32F4_APB1_CLOCK(I2C3)>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+		};
+
 		dac: dac@40007400 {
 			compatible = "st,stm32f4-dac-core";
 			reg = <0x40007400 0x400>;
diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 18117ce..bdebe05 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -129,7 +129,8 @@ static const struct stm32f4_gate_data stm32f429_gates[] __initconst = {
 	{ STM32F4_RCC_APB2ENR, 20,	"spi5",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 21,	"spi6",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 22,	"sai1",		"apb2_div" },
-	{ STM32F4_RCC_APB2ENR, 26,	"ltdc",		"apb2_div" },
+	{ STM32F4_RCC_APB2ENR, 26,	"ltdc",		"apb2_div",
+		CLK_IGNORE_UNUSED },
 };
 
 static const struct stm32f4_gate_data stm32f469_gates[] __initconst = {
@@ -1754,10 +1755,10 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 	stm32f4_rcc_register_pll("vco_in", &data->pll_data[0],
 			&stm32f4_clk_lock);
 
-	clks[PLL_VCO_I2S] = stm32f4_rcc_register_pll("vco_in",
+	clks[PLL_I2S] = stm32f4_rcc_register_pll("vco_in",
 			&data->pll_data[1], &stm32f4_clk_lock);
 
-	clks[PLL_VCO_SAI] = stm32f4_rcc_register_pll("vco_in",
+	clks[PLL_SAI] = stm32f4_rcc_register_pll("vco_in",
 			&data->pll_data[2], &stm32f4_clk_lock);
 
 	for (n = 0; n < MAX_POST_DIV; n++) {
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index a1723c1..e42692c 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -95,6 +95,14 @@ config DRM_PANEL_ILITEK_IL9322
 	  Say Y here if you want to enable support for Ilitek IL9322
 	  QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.
 
+config DRM_PANEL_ILITEK_IL9341
+	tristate "Ilitek ILI9341 240x320 QVGA panels"
+	depends on OF && SPI
+	select REGMAP
+	help
+	  Say Y here if you want to enable support for Ilitek IL9341
+	  QVGA (240x320) RGB panels.
+
 config DRM_PANEL_ILITEK_ILI9881C
 	tristate "Ilitek ILI9881C-based panels"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 96a883c..d123543 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) += panel-elida-kd35t133.o
 obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) += panel-feixin-k101-im2ba02.o
 obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
+obj-$(CONFIG_DRM_PANEL_ILITEK_IL9341) += panel-ilitek-ili9341.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
 obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
new file mode 100644
index 0000000..0b2b17f
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -0,0 +1,561 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Ilitek ILI9341 TFT LCD drm_panel driver.
+ *
+ * This panel can be configured to support:
+ * - 16-bit parallel RGB interface
+ *
+ * Copyright (C) 2020 Dillon Min <dillon.minfei@gmail.com>
+ * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c
+ */
+
+#include <linux/bitops.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#define DEFAULT_SPI_SPEED	10000000
+
+#define ILI9341_SLEEP_OUT            0x11   /* Sleep out register */
+#define ILI9341_GAMMA                0x26   /* Gamma register */
+#define ILI9341_DISPLAY_OFF          0x28   /* Display off register */
+#define ILI9341_DISPLAY_ON           0x29   /* Display on register */
+#define ILI9341_COLUMN_ADDR          0x2A   /* Colomn address register */
+#define ILI9341_PAGE_ADDR            0x2B   /* Page address register */
+#define ILI9341_GRAM                 0x2C   /* GRAM register */
+#define ILI9341_MAC                  0x36   /* Memory Access Control register*/
+#define ILI9341_PIXEL_FORMAT         0x3A   /* Pixel Format register */
+#define ILI9341_WDB                  0x51   /* Write Brightness Display
+						* register
+					     */
+#define ILI9341_WCD                  0x53   /* Write Control Display
+					     * register
+					     */
+#define ILI9341_RGB_INTERFACE        0xB0   /* RGB Interface Signal Control */
+#define ILI9341_FRC                  0xB1   /* Frame Rate Control register */
+#define ILI9341_BPC                  0xB5   /* Blanking Porch Control
+					     * register
+					     */
+#define ILI9341_DFC                  0xB6   /* Display Function Control
+					     * register
+					     */
+#define ILI9341_POWER1               0xC0   /* Power Control 1 register */
+#define ILI9341_POWER2               0xC1   /* Power Control 2 register */
+#define ILI9341_VCOM1                0xC5   /* VCOM Control 1 register */
+#define ILI9341_VCOM2                0xC7   /* VCOM Control 2 register */
+#define ILI9341_POWERA               0xCB   /* Power control A register */
+#define ILI9341_POWERB               0xCF   /* Power control B register */
+#define ILI9341_PGAMMA               0xE0   /* Positive Gamma Correction
+					     * register
+					     */
+#define ILI9341_NGAMMA               0xE1   /* Negative Gamma Correction
+					     * register
+					     */
+#define ILI9341_DTCA                 0xE8   /* Driver timing control A */
+#define ILI9341_DTCB                 0xEA   /* Driver timing control B */
+#define ILI9341_POWER_SEQ            0xED   /* Power on sequence register */
+#define ILI9341_3GAMMA_EN            0xF2   /* 3 Gamma enable register */
+#define ILI9341_INTERFACE            0xF6   /* Interface control register */
+#define ILI9341_PRC                  0xF7   /* Pump ratio control register */
+
+static u8 ili9341_cmd0[] = {0xc3, 0x08, 0x50};
+static u8 ili9341_powerb[] = {0x00, 0xc1, 0x30};
+static u8 ili9341_power_seq[] = {0x64, 0x03, 0x12, 0x81};
+static u8 ili9341_dtca[] = {0x85, 0x00, 0x78};
+static u8 ili9341_powera[] = {0x39, 0x2c, 0x00, 0x34, 0x02};
+static u8 ili9341_prc[] = {0x20};
+static u8 ili9341_dtcb[] = {0x00, 0x00};
+static u8 ili9341_frc[] = {0x00, 0x1b};
+static u8 ili9341_dfc1[] = {0x0a, 0xa2};
+static u8 ili9341_power1[] = {0x10};
+static u8 ili9341_power2[] = {0x10};
+static u8 ili9341_vcom1[] = {0x45, 0x15};
+static u8 ili9341_vcom2[] = {0x90};
+static u8 ili9341_mac[] = {0xc8};
+static u8 ili9341_gamma_en[] = {0x00};
+static u8 ili9341_rgb_intr[] = {0xc2};
+static u8 ili9341_dfc2[] = {0x0a, 0xa7, 0x27, 0x04};
+static u8 ili9341_column_addr[] = {0x00, 0x00, 0x00, 0xef};
+static u8 ili9341_page_addr[] = {0x00, 0x00, 0x01, 0x3f};
+static u8 ili9341_intr[] = {0x01, 0x00, 0x06};
+static u8 ili9341_gamma[] = {0x01};
+static u8 ili9341_pgamma[] = {0x0f, 0x29, 0x24, 0x0c, 0x0e, 0x09, 0x4e, 0x78,
+				0x3c, 0x09, 0x13, 0x05,	0x17, 0x11, 0x00};
+static u8 ili9341_ngamma[] = {0x00, 0x16, 0x1b, 0x04, 0x11, 0x07, 0x31, 0x33,
+				0x42, 0x05, 0x0c, 0x0a, 0x28, 0x2f, 0x0f};
+
+/**
+ * enum ili9341_input - the format of the incoming signal to the panel
+ *
+ * The panel can be connected to various input streams and four of them can
+ * be selected by electronic straps on the display. However it is possible
+ * to select another mode or override the electronic default with this
+ * setting.
+ */
+enum ili9341_input {
+	ILI9341_INPUT_PRGB_THROUGH = 0x0,
+	ILI9341_INPUT_PRGB_ALIGNED = 0x1,
+	ILI9341_INPUT_UNKNOWN = 0xf,
+};
+
+/**
+ * struct ili9341_config - the system specific ILI9341 configuration
+ * @width_mm: physical panel width [mm]
+ * @height_mm: physical panel height [mm]
+ * @input: the input/entry type used in this system, if this is set to
+ * ILI9341_INPUT_UNKNOWN the driver will try to figure it out by probing
+ * the hardware
+ * @dclk_active_high: data/pixel clock active high, data will be clocked
+ * in on the rising edge of the DCLK (this is usually the case).
+ * @de_active_high: DE (data entry) is active high
+ * @hsync_active_high: HSYNC is active high
+ * @vsync_active_high: VSYNC is active high
+ */
+struct ili9341_config {
+	u32 width_mm;
+	u32 height_mm;
+	enum ili9341_input input;
+	bool dclk_active_high;
+	bool de_active_high;
+	bool hsync_active_high;
+	bool vsync_active_high;
+};
+
+struct ili9341 {
+	struct device *dev;
+	const struct ili9341_config *conf;
+	struct drm_panel panel;
+	struct regmap *regmap;
+	struct gpio_desc *reset_gpio;
+	struct gpio_desc *dc_gpio;
+	enum ili9341_input input;
+	struct videomode vm;
+};
+
+static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
+{
+	return container_of(panel, struct ili9341, panel);
+}
+
+int ili9341_spi_transfer(struct spi_device *spi, u32 speed_hz,
+			  u8 bpw, const void *buf, size_t len)
+{
+	size_t max_chunk = spi_max_transfer_size(spi);
+	struct spi_transfer tr = {
+		.bits_per_word = bpw,
+		.speed_hz = speed_hz,
+		.len = len,
+	};
+	struct spi_message m;
+	size_t chunk;
+	int ret;
+
+	spi_message_init_with_transfers(&m, &tr, 1);
+
+	while (len) {
+		chunk = min(len, max_chunk);
+
+		tr.tx_buf = buf;
+		tr.len = chunk;
+		buf += chunk;
+		len -= chunk;
+
+		ret = spi_sync(spi, &m);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+static int ili9341_regmap_spi_write(void *context, const void *data,
+				    size_t count)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+	struct ili9341 *ili = spi_get_drvdata(spi);
+	int ret = 0;
+
+	gpiod_set_value_cansleep(ili->dc_gpio, 0);
+
+	ret = ili9341_spi_transfer(spi, DEFAULT_SPI_SPEED, 8, data+0, 1);
+	if (ret || count == 1 ||
+			((u8 *)data)[0] == ILI9341_GRAM ||
+			((u8 *)data)[0] == ILI9341_DISPLAY_ON ||
+			((u8 *)data)[0] == ILI9341_SLEEP_OUT ||
+			((u8 *)data)[0] == ILI9341_DISPLAY_OFF)
+		return ret;
+
+	gpiod_set_value_cansleep(ili->dc_gpio, 1);
+
+	return ili9341_spi_transfer(spi, DEFAULT_SPI_SPEED, 8, data+1, count-1);
+}
+
+static int ili9341_regmap_spi_read(void *context, const void *reg,
+				   size_t reg_size, void *val, size_t val_size)
+{
+	return 0;
+}
+
+static struct regmap_bus ili9341_regmap_bus = {
+	.write = ili9341_regmap_spi_write,
+	.read = ili9341_regmap_spi_read,
+	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
+	.val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static bool ili9341_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return false;
+}
+
+static bool ili9341_writeable_reg(struct device *dev, unsigned int reg)
+{
+	/* Just register 0 is read-only */
+	if (reg == 0x00)
+		return false;
+	return true;
+}
+
+static const struct regmap_config ili9341_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xff,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = ili9341_volatile_reg,
+	.writeable_reg = ili9341_writeable_reg,
+};
+
+static int ili9341_init(struct drm_panel *panel, struct ili9341 *ili)
+{
+	regmap_bulk_write(ili->regmap, 0xca,
+					ili9341_cmd0, sizeof(ili9341_cmd0));
+	regmap_bulk_write(ili->regmap, ILI9341_POWERB,
+				ili9341_powerb, sizeof(ili9341_powerb));
+	regmap_bulk_write(ili->regmap, ILI9341_POWER_SEQ,
+				ili9341_power_seq, sizeof(ili9341_power_seq));
+	regmap_bulk_write(ili->regmap, ILI9341_DTCA,
+				ili9341_dtca, sizeof(ili9341_dtca));
+	regmap_bulk_write(ili->regmap, ILI9341_POWERA,
+				ili9341_powera, sizeof(ili9341_powera));
+	regmap_write(ili->regmap, ILI9341_PRC, ili9341_prc[0]);
+	regmap_bulk_write(ili->regmap, ILI9341_DTCB,
+				ili9341_dtcb, sizeof(ili9341_dtcb));
+	regmap_bulk_write(ili->regmap, ILI9341_FRC,
+				ili9341_frc, sizeof(ili9341_frc));
+	regmap_bulk_write(ili->regmap, ILI9341_DFC,
+				ili9341_dfc1, sizeof(ili9341_dfc1));
+	regmap_write(ili->regmap, ILI9341_POWER1, ili9341_power1[0]);
+	regmap_write(ili->regmap, ILI9341_POWER2, ili9341_power2[0]);
+	regmap_bulk_write(ili->regmap, ILI9341_VCOM1,
+				ili9341_vcom1, sizeof(ili9341_vcom1));
+	regmap_write(ili->regmap, ILI9341_VCOM2, ili9341_vcom2[0]);
+	regmap_write(ili->regmap, ILI9341_MAC, ili9341_mac[0]);
+	regmap_write(ili->regmap, ILI9341_3GAMMA_EN, ili9341_gamma_en[0]);
+	regmap_write(ili->regmap, ILI9341_RGB_INTERFACE, ili9341_rgb_intr[0]);
+	regmap_bulk_write(ili->regmap, ILI9341_DFC,
+				ili9341_dfc2, sizeof(ili9341_dfc2));
+
+	/* colomn address set */
+	regmap_bulk_write(ili->regmap, ILI9341_COLUMN_ADDR,
+			ili9341_column_addr, sizeof(ili9341_column_addr));
+
+	/* Page Address Set */
+	regmap_bulk_write(ili->regmap, ILI9341_PAGE_ADDR,
+				ili9341_page_addr, sizeof(ili9341_page_addr));
+	regmap_bulk_write(ili->regmap, ILI9341_INTERFACE,
+				ili9341_intr, sizeof(ili9341_intr));
+	regmap_write(ili->regmap, ILI9341_GRAM, 0);
+	msleep(200);
+
+	regmap_write(ili->regmap, ILI9341_GAMMA, ili9341_gamma[0]);
+	regmap_bulk_write(ili->regmap, ILI9341_PGAMMA,
+				ili9341_pgamma, sizeof(ili9341_pgamma));
+	regmap_bulk_write(ili->regmap, ILI9341_NGAMMA,
+				ili9341_ngamma, sizeof(ili9341_ngamma));
+	regmap_write(ili->regmap, ILI9341_SLEEP_OUT, 0);
+	msleep(200);
+
+	regmap_write(ili->regmap, ILI9341_DISPLAY_ON, 0);
+
+	/* GRAM start writing */
+	regmap_write(ili->regmap, ILI9341_GRAM, 0);
+
+	dev_info(ili->dev, "initialized display\n");
+
+	return 0;
+}
+
+/*
+ * This power-on sequence if from the datasheet, page 57.
+ */
+static int ili9341_power_on(struct ili9341 *ili)
+{
+	/* Assert RESET */
+	gpiod_set_value(ili->reset_gpio, 1);
+
+	msleep(20);
+
+	/* De-assert RESET */
+	gpiod_set_value(ili->reset_gpio, 0);
+
+	msleep(10);
+
+	return 0;
+}
+
+static int ili9341_power_off(struct ili9341 *ili)
+{
+	return 0;
+}
+
+static int ili9341_disable(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	int ret;
+
+	ret = regmap_write(ili->regmap, ILI9341_DISPLAY_OFF, 0);
+	if (ret) {
+		dev_err(ili->dev, "unable to go to standby mode\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ili9341_unprepare(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+
+	return ili9341_power_off(ili);
+}
+
+static int ili9341_prepare(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	int ret;
+
+	ret = ili9341_power_on(ili);
+	if (ret < 0)
+		return ret;
+
+	ret = ili9341_init(panel, ili);
+	if (ret < 0)
+		ili9341_unprepare(panel);
+
+	return ret;
+}
+
+static int ili9341_enable(struct drm_panel *panel)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	int ret;
+
+	ret = regmap_write(ili->regmap, ILI9341_DISPLAY_ON, 0);
+	if (ret) {
+		dev_err(ili->dev, "unable to enable panel\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/* This is the only mode listed for parallel RGB in the datasheet */
+static const struct drm_display_mode prgb_320x240_mode = {
+	.clock = 6100,
+	.hdisplay = 240,
+	.hsync_start = 240 + 10,
+	.hsync_end = 240 + 10 + 10,
+	.htotal = 280,
+	.vdisplay = 320,
+	.vsync_start = 320 + 4,
+	.vsync_end = 320 + 4 + 2,
+	.vtotal = 328,
+	.vrefresh = 60,
+	.flags = 0,
+};
+
+static int ili9341_get_modes(struct drm_panel *panel,
+				struct drm_connector *connector)
+{
+	struct ili9341 *ili = panel_to_ili9341(panel);
+	struct drm_device *drm = connector->dev;
+	struct drm_display_mode *mode;
+	struct drm_display_info *info;
+
+	info = &connector->display_info;
+	info->width_mm = ili->conf->width_mm;
+	info->height_mm = ili->conf->height_mm;
+	if (ili->conf->dclk_active_high)
+		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
+	else
+		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
+
+	if (ili->conf->de_active_high)
+		info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+	else
+		info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
+
+	switch (ili->input) {
+	case ILI9341_INPUT_PRGB_THROUGH:
+	case ILI9341_INPUT_PRGB_ALIGNED:
+		mode = drm_mode_duplicate(drm, &prgb_320x240_mode);
+		break;
+	default:
+		mode = NULL;
+		break;
+	}
+	if (!mode) {
+		DRM_ERROR("bad mode or failed to add mode\n");
+		return -EINVAL;
+	}
+	drm_mode_set_name(mode);
+	/*
+	 * This is the preferred mode because most people are going
+	 * to want to use the display with VGA type graphics.
+	 */
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+	/* Set up the polarity */
+	if (ili->conf->hsync_active_high)
+		mode->flags |= DRM_MODE_FLAG_PHSYNC;
+	else
+		mode->flags |= DRM_MODE_FLAG_NHSYNC;
+	if (ili->conf->vsync_active_high)
+		mode->flags |= DRM_MODE_FLAG_PVSYNC;
+	else
+		mode->flags |= DRM_MODE_FLAG_NVSYNC;
+
+	mode->width_mm = ili->conf->width_mm;
+	mode->height_mm = ili->conf->height_mm;
+	drm_mode_probed_add(connector, mode);
+
+	return 1; /* Number of modes */
+}
+
+static const struct drm_panel_funcs ili9341_drm_funcs = {
+	.disable = ili9341_disable,
+	.unprepare = ili9341_unprepare,
+	.prepare = ili9341_prepare,
+	.enable = ili9341_enable,
+	.get_modes = ili9341_get_modes,
+};
+
+static int ili9341_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct ili9341 *ili;
+	const struct regmap_config *regmap_config;
+	int ret;
+
+	ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
+	if (!ili)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, ili);
+
+	ili->dev = dev;
+	/*
+	 * Every new incarnation of this display must have a unique
+	 * data entry for the system in this driver.
+	 */
+	ili->conf = of_device_get_match_data(dev);
+	if (!ili->conf) {
+		dev_err(dev, "missing device configuration\n");
+		return -ENODEV;
+	}
+
+	ili->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(ili->reset_gpio)) {
+		dev_err(dev, "failed to get RESET GPIO\n");
+		return PTR_ERR(ili->reset_gpio);
+	}
+
+	ili->dc_gpio = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(ili->dc_gpio)) {
+		dev_err(dev, "failed to get DC GPIO\n");
+		return PTR_ERR(ili->dc_gpio);
+	}
+
+	spi->bits_per_word = 8;
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		dev_err(dev, "spi setup failed.\n");
+		return ret;
+	}
+
+	regmap_config = &ili9341_regmap_config;
+
+	ili->regmap = devm_regmap_init(dev, &ili9341_regmap_bus, dev,
+				       regmap_config);
+	if (IS_ERR(ili->regmap)) {
+		dev_err(dev, "failed to allocate register map\n");
+		return PTR_ERR(ili->regmap);
+	}
+
+	ili->input = ili->conf->input;
+
+	drm_panel_init(&ili->panel, dev, &ili9341_drm_funcs,
+		       DRM_MODE_CONNECTOR_DPI);
+
+	return drm_panel_add(&ili->panel);
+}
+
+static int ili9341_remove(struct spi_device *spi)
+{
+	struct ili9341 *ili = spi_get_drvdata(spi);
+
+	ili9341_power_off(ili);
+	drm_panel_remove(&ili->panel);
+
+	return 0;
+}
+
+/*
+ * The Stm32f429-disco board has a panel ili9341 connected to ltdc controller
+ */
+static const struct ili9341_config ili9341_data = {
+	.width_mm = 65,
+	.height_mm = 50,
+	.input = ILI9341_INPUT_PRGB_THROUGH,
+	.dclk_active_high = true,
+	.de_active_high = false,
+	.hsync_active_high = false,
+	.vsync_active_high = false,
+};
+
+static const struct of_device_id ili9341_of_match[] = {
+	{
+		.compatible = "stm32f429-disco,ltdc-panel",
+		.data = &ili9341_data,
+	},
+	{
+		.compatible = "ilitek,ili9341",
+		.data = NULL,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili9341_of_match);
+
+static struct spi_driver ili9341_driver = {
+	.probe = ili9341_probe,
+	.remove = ili9341_remove,
+	.driver = {
+		.name = "panel-ilitek-ili9341",
+		.of_match_table = ili9341_of_match,
+	},
+};
+module_spi_driver(ili9341_driver);
+
+MODULE_AUTHOR("Dillon Min <dillon.minfei@gmail.com>");
+MODULE_DESCRIPTION("ILI9341 LCD panel driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 44ac6eb3..680cede 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -388,6 +388,10 @@ static int stm32h7_spi_get_fifo_size(struct stm32_spi *spi)
 	return count;
 }
 
+static void stm32f4_spi_tx_dummy(struct stm32_spi *spi)
+{
+	writeb_relaxed(0x55, spi->base + STM32F4_SPI_DR);
+}
 /**
  * stm32f4_spi_get_bpw_mask - Return bits per word mask
  * @spi: pointer to the spi controller data structure
@@ -811,7 +815,9 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 		mask |= STM32F4_SPI_SR_TXE;
 	}
 
-	if (!spi->cur_usedma && spi->cur_comm == SPI_FULL_DUPLEX) {
+	if (!spi->cur_usedma && (spi->cur_comm == SPI_FULL_DUPLEX ||
+				 spi->cur_comm == SPI_SIMPLEX_RX ||
+				 spi->cur_comm == SPI_3WIRE_RX)) {
 		/* TXE flag is set and is handled when RXNE flag occurs */
 		sr &= ~STM32F4_SPI_SR_TXE;
 		mask |= STM32F4_SPI_SR_RXNE | STM32F4_SPI_SR_OVR;
@@ -850,8 +856,10 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 		stm32f4_spi_read_rx(spi);
 		if (spi->rx_len == 0)
 			end = true;
-		else /* Load data for discontinuous mode */
+		else if (spi->tx_buf)/* Load data for discontinuous mode */
 			stm32f4_spi_write_tx(spi);
+		else if (spi->cur_comm == SPI_SIMPLEX_RX)
+			stm32f4_spi_tx_dummy(spi);
 	}
 
 end_irq:
@@ -1151,7 +1159,9 @@ static int stm32f4_spi_transfer_one_irq(struct stm32_spi *spi)
 	/* Enable the interrupts relative to the current communication mode */
 	if (spi->cur_comm == SPI_SIMPLEX_TX || spi->cur_comm == SPI_3WIRE_TX) {
 		cr2 |= STM32F4_SPI_CR2_TXEIE;
-	} else if (spi->cur_comm == SPI_FULL_DUPLEX) {
+	} else if (spi->cur_comm == SPI_FULL_DUPLEX ||
+				spi->cur_comm == SPI_SIMPLEX_RX ||
+				spi->cur_comm == SPI_3WIRE_RX) {
 		/* In transmit-only mode, the OVR flag is set in the SR register
 		 * since the received data are never read. Therefore set OVR
 		 * interrupt only when rx buffer is available.
@@ -1170,6 +1180,8 @@ static int stm32f4_spi_transfer_one_irq(struct stm32_spi *spi)
 	/* starting data transfer when buffer is loaded */
 	if (spi->tx_buf)
 		stm32f4_spi_write_tx(spi);
+	else if (spi->cur_comm == SPI_SIMPLEX_RX)
+		stm32f4_spi_tx_dummy(spi);
 
 	spin_unlock_irqrestore(&spi->lock, flags);
 
@@ -1462,9 +1474,15 @@ static int stm32f4_spi_set_mode(struct stm32_spi *spi, unsigned int comm_type)
 		stm32_spi_set_bits(spi, STM32F4_SPI_CR1,
 					STM32F4_SPI_CR1_BIDIMODE |
 					STM32F4_SPI_CR1_BIDIOE);
-	} else if (comm_type == SPI_FULL_DUPLEX) {
+	} else if (comm_type == SPI_FULL_DUPLEX ||
+				comm_type == SPI_SIMPLEX_RX) {
 		stm32_spi_clr_bits(spi, STM32F4_SPI_CR1,
 					STM32F4_SPI_CR1_BIDIMODE |
+					STM32F4_SPI_CR1_RXONLY);
+	} else if (comm_type == SPI_3WIRE_RX) {
+		stm32_spi_set_bits(spi, STM32F4_SPI_CR1,
+					STM32F4_SPI_CR1_BIDIMODE);
+		stm32_spi_clr_bits(spi, STM32F4_SPI_CR1,
 					STM32F4_SPI_CR1_BIDIOE);
 	} else {
 		return -EINVAL;
-- 
2.7.4


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