Message-ID: <86f97466-3ab4-0560-2372-a819d1128308@tronnes.org>
Date:   Fri, 10 Nov 2017 19:44:17 +0100
From:   Noralf Trønnes <noralf@...nnes.org>
To:     David Lechner <david@...hnology.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] drm/tinydrm: add driver for ILI9225 panels


Den 08.11.2017 04.52, skrev David Lechner:
> This adds a new driver for display panels based on the Ilitek ILI9225
> controller.
>
> This was developed for a no-name panel with a red PCB that is commonly
> marketed for Arduino. See <https://github.com/Nkawu/TFT_22_ILI9225>.
>
> I really did try very hard to find a make and model for this panel, but
> there doesn't seem to be one, so the best I can do is offer the picture
> in the link above for identification.
>
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>   MAINTAINERS                       |   6 +
>   drivers/gpu/drm/tinydrm/Kconfig   |  10 +
>   drivers/gpu/drm/tinydrm/Makefile  |   1 +
>   drivers/gpu/drm/tinydrm/ili9225.c | 547 ++++++++++++++++++++++++++++++++++++++
>   4 files changed, 564 insertions(+)
>   create mode 100644 drivers/gpu/drm/tinydrm/ili9225.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0d77f22..72404f3 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4372,6 +4372,12 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
>   S:	Maintained
>   F:	drivers/gpu/drm/tve200/
>   
> +DRM DRIVER FOR ILITEK ILI9225 PANELS
> +M:	David Lechner <david@...hnology.com>
> +S:	Maintained
> +F:	drivers/gpu/drm/tinydrm/ili9225.c
> +F:	Documentation/devicetree/bindings/display/ili9225.txt
> +
>   DRM DRIVER FOR INTEL I810 VIDEO CARDS
>   S:	Orphan / Obsolete
>   F:	drivers/gpu/drm/i810/
> diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
> index 2e790e7..90c5bd5 100644
> --- a/drivers/gpu/drm/tinydrm/Kconfig
> +++ b/drivers/gpu/drm/tinydrm/Kconfig
> @@ -12,6 +12,16 @@ menuconfig DRM_TINYDRM
>   config TINYDRM_MIPI_DBI
>   	tristate
>   
> +config TINYDRM_ILI9225
> +	tristate "DRM support for ILI9225 display panels"
> +	depends on DRM_TINYDRM && SPI
> +	select TINYDRM_MIPI_DBI
> +	help
> +	  DRM driver for the following Ilitek ILI9225 panels:
> +	  * No-name 2.2" color screen module
> +
> +	  If M is selected the module will be called ili9225.
> +
>   config TINYDRM_MI0283QT
>   	tristate "DRM support for MI0283QT"
>   	depends on DRM_TINYDRM && SPI
> diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
> index 0c184bd..8aeee53 100644
> --- a/drivers/gpu/drm/tinydrm/Makefile
> +++ b/drivers/gpu/drm/tinydrm/Makefile
> @@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_TINYDRM)		+= core/
>   obj-$(CONFIG_TINYDRM_MIPI_DBI)		+= mipi-dbi.o
>   
>   # Displays
> +obj-$(CONFIG_TINYDRM_ILI9225)		+= ili9225.o
>   obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
>   obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o
>   obj-$(CONFIG_TINYDRM_ST7586)		+= st7586.o
> diff --git a/drivers/gpu/drm/tinydrm/ili9225.c b/drivers/gpu/drm/tinydrm/ili9225.c
> new file mode 100644
> index 0000000..07e1b8b
> --- /dev/null
> +++ b/drivers/gpu/drm/tinydrm/ili9225.c
> @@ -0,0 +1,547 @@
> +/*
> + * DRM driver for Ilitek ILI9225 panels
> + *
> + * Copyright 2017 David Lechner <david@...hnology.com>
> + *
> + * Lots of code copied from mipi-dbi.c
> + * Copyright 2016 Noralf Trønnes
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/dma-buf.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/property.h>
> +#include <linux/spi/spi.h>
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/tinydrm/mipi-dbi.h>
> +#include <drm/tinydrm/tinydrm-helpers.h>
> +
> +#define ILI9225_DRIVER_READ_CODE	0x00
> +#define ILI9225_DRIVER_OUTPUT_CONTROL	0x01
> +#define ILI9225_LCD_AC_DRIVING_CONTROL	0x02
> +#define ILI9225_ENTRY_MODE		0x03
> +#define ILI9225_DISPLAY_CONTROL_1	0x07
> +#define ILI9225_BLANK_PERIOD_CONTROL_1	0x08
> +#define ILI9225_FRAME_CYCLE_CONTROL	0x0b
> +#define ILI9225_INTERFACE_CONTROL	0x0c
> +#define ILI9225_OSCILLATION_CONTROL	0x0f
> +#define ILI9225_POWER_CONTROL_1		0x10
> +#define ILI9225_POWER_CONTROL_2		0x11
> +#define ILI9225_POWER_CONTROL_3		0x12
> +#define ILI9225_POWER_CONTROL_4		0x13
> +#define ILI9225_POWER_CONTROL_5		0x14
> +#define ILI9225_VCI_RECYCLING		0x15
> +#define ILI9225_RAM_ADDRESS_SET_1	0x20
> +#define ILI9225_RAM_ADDRESS_SET_2	0x21
> +#define ILI9225_WRITE_DATA_TO_GRAM	0x22
> +#define ILI9225_SOFTWARE_RESET		0x28
> +#define ILI9225_GATE_SCAN_CONTROL	0x30
> +#define ILI9225_VERTICAL_SCROLL_1	0x31
> +#define ILI9225_VERTICAL_SCROLL_2	0x32
> +#define ILI9225_VERTICAL_SCROLL_3	0x33
> +#define ILI9225_PARTIAL_DRIVING_POS_1	0x34
> +#define ILI9225_PARTIAL_DRIVING_POS_2	0x35
> +#define ILI9225_HORIZ_WINDOW_ADDR_1	0x36
> +#define ILI9225_HORIZ_WINDOW_ADDR_2	0x37
> +#define ILI9225_VERT_WINDOW_ADDR_1	0x38
> +#define ILI9225_VERT_WINDOW_ADDR_2	0x39
> +#define ILI9225_GAMMA_CONTROL_1		0x50
> +#define ILI9225_GAMMA_CONTROL_2		0x51
> +#define ILI9225_GAMMA_CONTROL_3		0x52
> +#define ILI9225_GAMMA_CONTROL_4		0x53
> +#define ILI9225_GAMMA_CONTROL_5		0x54
> +#define ILI9225_GAMMA_CONTROL_6		0x55
> +#define ILI9225_GAMMA_CONTROL_7		0x56
> +#define ILI9225_GAMMA_CONTROL_8		0x57
> +#define ILI9225_GAMMA_CONTROL_9		0x58
> +#define ILI9225_GAMMA_CONTROL_10	0x59
> +
> +static int ili9225_buf_copy(void *dst, struct drm_framebuffer *fb,
> +			    struct drm_clip_rect *clip, bool swap)
> +{
> +	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> +	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
> +	struct drm_format_name_buf format_name;
> +	void *src = cma_obj->vaddr;
> +	int ret = 0;
> +
> +	if (import_attach) {
> +		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
> +					       DMA_FROM_DEVICE);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	switch (fb->format->format) {
> +	case DRM_FORMAT_RGB565:
> +		if (swap)
> +			tinydrm_swab16(dst, src, fb, clip);
> +		else
> +			tinydrm_memcpy(dst, src, fb, clip);
> +		break;
> +	case DRM_FORMAT_XRGB8888:
> +		tinydrm_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
> +		break;
> +	default:
> +		dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
> +			     drm_get_format_name(fb->format->format,
> +						 &format_name));
> +		return -EINVAL;
> +	}
> +
> +	if (import_attach)
> +		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
> +					     DMA_FROM_DEVICE);
> +	return ret;
> +}
> +
> +static int ili9225_fb_dirty(struct drm_framebuffer *fb,
> +			    struct drm_file *file_priv, unsigned int flags,
> +			    unsigned int color, struct drm_clip_rect *clips,
> +			    unsigned int num_clips)
> +{
> +	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> +	struct tinydrm_device *tdev = fb->dev->dev_private;
> +	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
> +	bool swap = mipi->swap_bytes;
> +	struct drm_clip_rect clip;
> +	u8 x_start, y_start;
> +	u8 x1, x2, y1, y2;
> +	int ret = 0;
> +	bool full;
> +	void *tr;
> +
> +	mutex_lock(&tdev->dirty_lock);
> +
> +	if (!mipi->enabled)
> +		goto out_unlock;
> +
> +	/* fbdev can flush even when we're not interested */
> +	if (tdev->pipe.plane.fb != fb)
> +		goto out_unlock;
> +
> +	full = tinydrm_merge_clips(&clip, clips, num_clips, flags,
> +				   fb->width, fb->height);
> +
> +	DRM_DEBUG("Flushing [FB:%d] x1=%u, x2=%u, y1=%u, y2=%u\n", fb->base.id,
> +		  clip.x1, clip.x2, clip.y1, clip.y2);
> +
> +	if (!mipi->dc || !full || swap ||
> +	    fb->format->format == DRM_FORMAT_XRGB8888) {
> +		tr = mipi->tx_buf;
> +		ret = ili9225_buf_copy(mipi->tx_buf, fb, &clip, swap);
> +		if (ret)
> +			goto out_unlock;
> +	} else {
> +		tr = cma_obj->vaddr;
> +	}
> +
> +	switch (mipi->rotation) {
> +	default:
> +		x1 = clip.x1;
> +		x2 = clip.x2 - 1;
> +		y1 = clip.y1;
> +		y2 = clip.y2 - 1;
> +		x_start = x1;
> +		y_start = y1;
> +		break;
> +	case 90:
> +		x1 = clip.y1;
> +		x2 = clip.y2 - 1;
> +		y1 = fb->width - clip.x2;
> +		y2 = fb->width - clip.x1 - 1;
> +		x_start = x1;
> +		y_start = y2;
> +		break;
> +	case 180:
> +		x1 = fb->width - clip.x2;
> +		x2 = fb->width - clip.x1 - 1;
> +		y1 = fb->height - clip.y2;
> +		y2 = fb->height - clip.y1 - 1;
> +		x_start = x2;
> +		y_start = y2;
> +		break;
> +	case 270:
> +		x1 = fb->height - clip.y2;
> +		x2 = fb->height - clip.y1 - 1;
> +		y1 = clip.x1;
> +		y2 = clip.x2 - 1;
> +		x_start = x2;
> +		y_start = y1;
> +		break;
> +	}
> +
> +	mipi_dbi_command(mipi, ILI9225_HORIZ_WINDOW_ADDR_1, 0x00, x2);

Please make a register write function that takes the reg value as 16-bit.
Like ili9225_write(mipi, u8 reg, u16 val) or something.

I have come to understand that mipi isn't really a good variable name here.
mipi can be a lot of things, MIPI DSI for instance uses dsi as a variable
name. So we really should use 'dbi' instead of 'mipi'.

Noralf.

> +	mipi_dbi_command(mipi, ILI9225_HORIZ_WINDOW_ADDR_2, 0x00, x1);
> +	mipi_dbi_command(mipi, ILI9225_VERT_WINDOW_ADDR_1, 0x00, y2);
> +	mipi_dbi_command(mipi, ILI9225_VERT_WINDOW_ADDR_2, 0x00, y1);
> +
> +	mipi_dbi_command(mipi, ILI9225_RAM_ADDRESS_SET_1, 0x00, x_start);
> +	mipi_dbi_command(mipi, ILI9225_RAM_ADDRESS_SET_2, 0x00, y_start);
> +
> +	ret = mipi_dbi_command_buf(mipi, ILI9225_WRITE_DATA_TO_GRAM, tr,
> +				(clip.x2 - clip.x1) * (clip.y2 - clip.y1) * 2);
> +
> +out_unlock:
> +	mutex_unlock(&tdev->dirty_lock);
> +
> +	if (ret)
> +		dev_err_once(fb->dev->dev, "Failed to update display %d\n",
> +			     ret);
> +
> +	return ret;
> +}
> +
> +static const struct drm_framebuffer_funcs ili9225_fb_funcs = {
> +	.destroy	= drm_gem_fb_destroy,
> +	.create_handle	= drm_gem_fb_create_handle,
> +	.dirty		= ili9225_fb_dirty,
> +};
> +
> +static void ili9225_pipe_enable(struct drm_simple_display_pipe *pipe,
> +				struct drm_crtc_state *crtc_state)
> +{
> +	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
> +	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
> +	struct drm_framebuffer *fb = pipe->plane.fb;
> +	struct device *dev = tdev->drm->dev;
> +	int ret;
> +	u8 am_id;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	mipi_dbi_hw_reset(mipi);
> +
> +	/*
> +	 * There don't seem to be two example init sequences that match, so
> +	 * using the one from the popular Arduino library for this display.
> +	 * https://github.com/Nkawu/TFT_22_ILI9225/blob/master/src/TFT_22_ILI9225.cpp
> +	 */
> +
> +	ret = mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_1, 0x00, 0x00);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
> +		return;
> +	}
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_2, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_3, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_4, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_5, 0x00, 0x00);
> +
> +	msleep(40);
> +
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_2, 0x00, 0x18);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_3, 0x61, 0x21);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_4, 0x00, 0x6f);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_5, 0x49, 0x5f);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_1, 0x08, 0x00);
> +
> +	msleep(10);
> +
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_2, 0x10, 0x3b);
> +
> +	msleep(50);
> +
> +	switch (mipi->rotation) {
> +	default:
> +		am_id = 0x30;
> +		break;
> +	case 90:
> +		am_id = 0x18;
> +		break;
> +	case 180:
> +		am_id = 0x00;
> +		break;
> +	case 270:
> +		am_id = 0x28;
> +		break;
> +	}
> +	mipi_dbi_command(mipi, ILI9225_DRIVER_OUTPUT_CONTROL, 0x01, 0x1c);
> +	mipi_dbi_command(mipi, ILI9225_LCD_AC_DRIVING_CONTROL, 0x01, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_ENTRY_MODE, 0x10, am_id);
> +	mipi_dbi_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_BLANK_PERIOD_CONTROL_1, 0x08, 0x08);
> +	mipi_dbi_command(mipi, ILI9225_FRAME_CYCLE_CONTROL, 0x11, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_INTERFACE_CONTROL, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_OSCILLATION_CONTROL, 0x0d, 0x01);
> +	mipi_dbi_command(mipi, ILI9225_VCI_RECYCLING, 0x00, 0x20);
> +	mipi_dbi_command(mipi, ILI9225_RAM_ADDRESS_SET_1, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_RAM_ADDRESS_SET_2, 0x00, 0x00);
> +
> +	mipi_dbi_command(mipi, ILI9225_GATE_SCAN_CONTROL, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_VERTICAL_SCROLL_1, 0x00, 0xdb);
> +	mipi_dbi_command(mipi, ILI9225_VERTICAL_SCROLL_2, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_VERTICAL_SCROLL_3, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_PARTIAL_DRIVING_POS_1, 0x00, 0xdb);
> +	mipi_dbi_command(mipi, ILI9225_PARTIAL_DRIVING_POS_2, 0x00, 0x00);
> +
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_1, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_2, 0x08, 0x08);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_3, 0x08, 0x0a);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_4, 0x00, 0x0a);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_5, 0x0a, 0x08);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_6, 0x08, 0x08);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_7, 0x00, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_8, 0x0a, 0x00);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_9, 0x07, 0x10);
> +	mipi_dbi_command(mipi, ILI9225_GAMMA_CONTROL_10, 0x07, 0x10);
> +
> +	mipi_dbi_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x00, 0x12);
> +
> +	msleep(50);
> +
> +	mipi_dbi_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x10, 0x17);
> +
> +	mipi->enabled = true;
> +
> +	if (fb)
> +		fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
> +}
> +
> +static void ili9225_pipe_disable(struct drm_simple_display_pipe *pipe)
> +{
> +	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
> +	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	if (!mipi->enabled)
> +		return;
> +
> +	mipi_dbi_command(mipi, ILI9225_DISPLAY_CONTROL_1, 0x00, 0x00);
> +	msleep(50);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_2, 0x00, 0x07);
> +	msleep(50);
> +	mipi_dbi_command(mipi, ILI9225_POWER_CONTROL_1, 0x0a, 0x02);
> +
> +	mipi->enabled = false;
> +}
> +
> +static u32 ili9225_spi_cmd_max_speed(struct spi_device *spi, size_t len)
> +{
> +	if (len > 64)
> +		return 0; /* use default */
> +
> +	return min_t(u32, 10000000, spi->max_speed_hz);
> +}
> +
> +static int ili9225_command(struct mipi_dbi *mipi, u8 cmd, u8 *par, size_t num)
> +{
> +	struct spi_device *spi = mipi->spi;
> +	unsigned int bpw = 8;
> +	u32 speed_hz;
> +	int ret;
> +
> +	gpiod_set_value_cansleep(mipi->dc, 0);
> +	speed_hz = ili9225_spi_cmd_max_speed(spi, 1);
> +	ret = tinydrm_spi_transfer(spi, speed_hz, NULL, 8, &cmd, 1);
> +	if (ret || !num)
> +		return ret;
> +
> +	if (cmd == ILI9225_WRITE_DATA_TO_GRAM && !mipi->swap_bytes)
> +		bpw = 16;
> +
> +	gpiod_set_value_cansleep(mipi->dc, 1);
> +	speed_hz = ili9225_spi_cmd_max_speed(spi, num);
> +
> +	return tinydrm_spi_transfer(spi, speed_hz, NULL, bpw, par, num);
> +}
> +
> +static int ili9225_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
> +			    struct gpio_desc *dc)
> +{
> +	size_t tx_size = tinydrm_spi_max_transfer_size(spi, 0);
> +	struct device *dev = &spi->dev;
> +	int ret;
> +
> +	if (tx_size < 16) {
> +		DRM_ERROR("SPI transmit buffer too small: %zu\n", tx_size);
> +		return -EINVAL;
> +	}
> +
> +	/*
> +	 * Even though it's not the SPI device that does DMA (the master does),
> +	 * the dma mask is necessary for the dma_alloc_wc() in
> +	 * drm_gem_cma_create(). The dma_addr returned will be a physical
> +	 * address which might be different from the bus address, but this is
> +	 * not a problem since the address will not be used.
> +	 * The virtual address is used in the transfer and the SPI core
> +	 * re-maps it on the SPI master device using the DMA streaming API
> +	 * (spi_map_buf()).
> +	 */
> +	if (!dev->coherent_dma_mask) {
> +		ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
> +		if (ret) {
> +			dev_warn(dev, "Failed to set dma mask %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	mipi->spi = spi;
> +
> +	mipi->command = ili9225_command;
> +	mipi->dc = dc;
> +	if (tinydrm_machine_little_endian() &&
> +	    !tinydrm_spi_bpw_supported(spi, 16))
> +		mipi->swap_bytes = true;
> +
> +	DRM_DEBUG_DRIVER("SPI speed: %uMHz\n", spi->max_speed_hz / 1000000);
> +
> +	return 0;
> +}
> +
> +static const u32 ili9225_formats[] = {
> +	DRM_FORMAT_RGB565,
> +	DRM_FORMAT_XRGB8888,
> +};
> +
> +static int ili9225_init(struct device *dev, struct mipi_dbi *mipi,
> +			const struct drm_simple_display_pipe_funcs *pipe_funcs,
> +			struct drm_driver *driver,
> +			const struct drm_display_mode *mode,
> +			unsigned int rotation)
> +{
> +	size_t bufsize = mode->vdisplay * mode->hdisplay * sizeof(u16);
> +	struct tinydrm_device *tdev = &mipi->tinydrm;
> +	int ret;
> +
> +	if (!mipi->command)
> +		return -EINVAL;
> +
> +	mutex_init(&mipi->cmdlock);
> +
> +	mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
> +	if (!mipi->tx_buf)
> +		return -ENOMEM;
> +
> +	ret = devm_tinydrm_init(dev, tdev, &ili9225_fb_funcs, driver);
> +	if (ret)
> +		return ret;
> +
> +	ret = tinydrm_display_pipe_init(tdev, pipe_funcs,
> +					DRM_MODE_CONNECTOR_VIRTUAL,
> +					ili9225_formats,
> +					ARRAY_SIZE(ili9225_formats), mode,
> +					rotation);
> +	if (ret)
> +		return ret;
> +
> +	tdev->drm->mode_config.preferred_depth = 16;
> +	mipi->rotation = rotation;
> +
> +	drm_mode_config_reset(tdev->drm);
> +
> +	DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
> +		      tdev->drm->mode_config.preferred_depth, rotation);
> +
> +	return 0;
> +}
> +
> +static const struct drm_simple_display_pipe_funcs ili9225_pipe_funcs = {
> +	.enable		= ili9225_pipe_enable,
> +	.disable	= ili9225_pipe_disable,
> +	.update		= tinydrm_display_pipe_update,
> +	.prepare_fb	= tinydrm_display_pipe_prepare_fb,
> +};
> +
> +static const struct drm_display_mode ili9225_mode = {
> +	TINYDRM_MODE(176, 220, 35, 44),
> +};
> +
> +DEFINE_DRM_GEM_CMA_FOPS(ili9225_fops);
> +
> +static struct drm_driver ili9225_driver = {
> +	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
> +				  DRIVER_ATOMIC,
> +	.fops			= &ili9225_fops,
> +	TINYDRM_GEM_DRIVER_OPS,
> +	.lastclose		= tinydrm_lastclose,
> +	.name			= "ili9225",
> +	.desc			= "Ilitek ILI9225",
> +	.date			= "20171106",
> +	.major			= 1,
> +	.minor			= 0,
> +};
> +
> +static const struct of_device_id ili9225_of_match[] = {
> +	{ .compatible = "generic,2.2in-176x220-ili9225-tft" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, ili9225_of_match);
> +
> +static const struct spi_device_id ili9225_id[] = {
> +	{ "2.2in-176x220-ili9225-tft", 0 },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(spi, ili9225_id);
> +
> +static int ili9225_probe(struct spi_device *spi)
> +{
> +	struct device *dev = &spi->dev;
> +	struct mipi_dbi *mipi;
> +	struct gpio_desc *rs;
> +	u32 rotation = 0;
> +	int ret;
> +
> +	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
> +	if (!mipi)
> +		return -ENOMEM;
> +
> +	mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(mipi->reset)) {
> +		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
> +		return PTR_ERR(mipi->reset);
> +	}
> +
> +	rs = devm_gpiod_get(dev, "rs", GPIOD_OUT_LOW);
> +	if (IS_ERR(rs)) {
> +		DRM_DEV_ERROR(dev, "Failed to get gpio 'rs'\n");
> +		return PTR_ERR(rs);
> +	}
> +
> +	device_property_read_u32(dev, "rotation", &rotation);
> +
> +	ret = ili9225_spi_init(spi, mipi, rs);
> +	if (ret)
> +		return ret;
> +
> +	ret = ili9225_init(&spi->dev, mipi, &ili9225_pipe_funcs,
> +			   &ili9225_driver, &ili9225_mode, rotation);
> +	if (ret)
> +		return ret;
> +
> +	spi_set_drvdata(spi, mipi);
> +
> +	return devm_tinydrm_register(&mipi->tinydrm);
> +}
> +
> +static void ili9225_shutdown(struct spi_device *spi)
> +{
> +	struct mipi_dbi *mipi = spi_get_drvdata(spi);
> +
> +	tinydrm_shutdown(&mipi->tinydrm);
> +}
> +
> +static struct spi_driver ili9225_spi_driver = {
> +	.driver = {
> +		.name = "ili9225",
> +		.owner = THIS_MODULE,
> +		.of_match_table = ili9225_of_match,
> +	},
> +	.id_table = ili9225_id,
> +	.probe = ili9225_probe,
> +	.shutdown = ili9225_shutdown,
> +};
> +module_spi_driver(ili9225_spi_driver);
> +
> +MODULE_DESCRIPTION("Ilitek ILI9225 DRM driver");
> +MODULE_AUTHOR("David Lechner <david@...hnology.com>");
> +MODULE_LICENSE("GPL");

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