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SubjectRe: [PATCH v1 2/2] drm/tinydrm: add driver for ILI9225 panels
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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@lechnology.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@lechnology.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@lechnology.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@lechnology.com>");
> +MODULE_LICENSE("GPL");

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