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Subject[PATCH v2 2/4] drm/tinydrm: add support for LEGO MINDSTORMS EV3 LCD
Date
LEGO MINDSTORMS EV3 has an LCD with a ST7586 controller. This adds a new
module for the ST7586 controller with parameters for the EV3 LCD display.

Signed-off-by: David Lechner <david@lechnology.com>
---
.../devicetree/bindings/display/st7586.txt | 26 +
drivers/gpu/drm/tinydrm/Kconfig | 10 +
drivers/gpu/drm/tinydrm/Makefile | 1 +
drivers/gpu/drm/tinydrm/st7586.c | 579 +++++++++++++++++++++
include/drm/tinydrm/st7586.h | 34 ++
5 files changed, 650 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/st7586.txt
create mode 100644 drivers/gpu/drm/tinydrm/st7586.c
create mode 100644 include/drm/tinydrm/st7586.h

diff --git a/Documentation/devicetree/bindings/display/st7586.txt b/Documentation/devicetree/bindings/display/st7586.txt
new file mode 100644
index 0000000..acf784aa
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/st7586.txt
@@ -0,0 +1,26 @@
+Sitronix ST7586 display panel
+
+Required properties:
+- compatible: "lego,ev3-lcd".
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in ../spi/spi-bus.txt must be specified.
+
+Optional properties:
+- dc-gpios: D/C pin. The presence/absence of this GPIO determines
+ the panel interface mode (IM[3:0] pins):
+ - present: IM=x110 4-wire 8-bit data serial interface
+ - absent: IM=x101 3-wire 9-bit data serial interface
+- reset-gpios: Reset pin
+- power-supply: A regulator node for the supply voltage.
+- backlight: phandle of the backlight device attached to the panel
+- rotation: panel rotation in degrees counter clockwise (0,90,180,270)
+
+Example:
+ display@0{
+ compatible = "lego,ev3-lcd";
+ reg = <0>;
+ spi-max-frequency = <10000000>;
+ dc-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
+ };
diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
index f17c3ca..2e790e7 100644
--- a/drivers/gpu/drm/tinydrm/Kconfig
+++ b/drivers/gpu/drm/tinydrm/Kconfig
@@ -32,3 +32,13 @@ config TINYDRM_REPAPER
2.71" TFT EPD Panel (E2271CS021)

If M is selected the module will be called repaper.
+
+config TINYDRM_ST7586
+ tristate "DRM support for Sitronix ST7586 display panels"
+ depends on DRM_TINYDRM && SPI
+ select TINYDRM_MIPI_DBI
+ help
+ DRM driver for the following Sitronix ST7586 panels:
+ * LEGO MINDSTORMS EV3
+
+ If M is selected the module will be called st7586.
diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
index 95bb4d4..0c184bd 100644
--- a/drivers/gpu/drm/tinydrm/Makefile
+++ b/drivers/gpu/drm/tinydrm/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o
# Displays
obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o
obj-$(CONFIG_TINYDRM_REPAPER) += repaper.o
+obj-$(CONFIG_TINYDRM_ST7586) += st7586.o
diff --git a/drivers/gpu/drm/tinydrm/st7586.c b/drivers/gpu/drm/tinydrm/st7586.c
new file mode 100644
index 0000000..6093021
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/st7586.c
@@ -0,0 +1,579 @@
+/*
+ * DRM driver for Sitronix ST7586 panels
+ *
+ * Copyright 2017 David Lechner <david@lechnology.com>
+ *
+ * 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/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+#include <drm/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/st7586.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+
+static inline u8 st7586_rgb565_to_gray2(u16 rgb)
+{
+ u8 r = (rgb & 0xf800) >> 11;
+ u8 g = (rgb & 0x07e0) >> 5;
+ u8 b = rgb & 0x001f;
+ /* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
+ /* g is already * 2 because it is 6-bit */
+ u8 gray5 = (3 * r + 3 * g + b) / 10;
+
+ return gray5 >> 3;
+}
+
+static void st7586_from_rgb565(u8 *dst, void *vaddr,
+ struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip)
+{
+ size_t len;
+ unsigned int x, y;
+ u16 *src, *buf;
+ u8 val;
+
+ /* 3 pixels per byte, so grow clip to nearest multiple of 3 */
+ clip->x1 = clip->x1 / 3 * 3;
+ clip->x2 = (clip->x2 + 2) / 3 * 3;
+ len = (clip->x2 - clip->x1) * sizeof(u16);
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ for (y = clip->y1; y < clip->y2; y++) {
+ src = vaddr + (y * fb->pitches[0]);
+ src += clip->x1;
+ memcpy(buf, src, len);
+ src = buf;
+ for (x = clip->x1; x < clip->x2; x += 3) {
+ val = st7586_rgb565_to_gray2(*src++) << 6;
+ if (val & 0xC0)
+ val |= 0x20;
+ val |= st7586_rgb565_to_gray2(*src++) << 3;
+ if (val & 0x18)
+ val |= 0x04;
+ val |= st7586_rgb565_to_gray2(*src++);
+ *dst++ = ~val;
+ }
+ }
+
+ /* now adjust the clip so it applies to dst */
+ clip->x1 /= 3;
+ clip->x2 /= 3;
+
+ kfree(buf);
+}
+
+static inline u8 st7586_xrgb8888_to_gray2(u32 rgb)
+{
+ u8 r = (rgb & 0x00ff0000) >> 16;
+ u8 g = (rgb & 0x0000ff00) >> 8;
+ u8 b = rgb & 0x000000ff;
+ /* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
+ u8 gray8 = (3 * r + 6 * g + b) / 10;
+
+ return gray8 >> 6;
+}
+
+static void st7586_from_xrgb8888(u8 *dst, void *vaddr,
+ struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip)
+{
+ size_t len;
+ unsigned int x, y;
+ u32 *src, *buf;
+ u8 val;
+
+ /* 3 pixels per byte, so grow clip to nearest multiple of 3 */
+ clip->x1 = clip->x1 / 3 * 3;
+ clip->x2 = (clip->x2 + 2) / 3 * 3;
+ len = (clip->x2 - clip->x1) * sizeof(u32);
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ for (y = clip->y1; y < clip->y2; y++) {
+ src = vaddr + (y * fb->pitches[0]);
+ src += clip->x1;
+ memcpy(buf, src, len);
+ src = buf;
+ for (x = clip->x1; x < clip->x2; x += 3) {
+ val = st7586_xrgb8888_to_gray2(*src++) << 6;
+ if (val & 0xC0)
+ val |= 0x20;
+ val |= st7586_xrgb8888_to_gray2(*src++) << 3;
+ if (val & 0x18)
+ val |= 0x04;
+ val |= st7586_xrgb8888_to_gray2(*src++);
+ *dst++ = ~val;
+ }
+ }
+
+ /* now adjust the clip so it applies to dst */
+ clip->x1 /= 3;
+ clip->x2 /= 3;
+
+ kfree(buf);
+}
+
+static int st7586_mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip)
+{
+ 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:
+ st7586_from_rgb565(dst, src, fb, clip);
+ break;
+ case DRM_FORMAT_XRGB8888:
+ st7586_from_xrgb8888(dst, src, fb, clip);
+ break;
+ default:
+ dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
+ drm_get_format_name(fb->format->format,
+ &format_name));
+ ret = -EINVAL;
+ break;
+ }
+
+ if (import_attach)
+ ret = dma_buf_end_cpu_access(import_attach->dmabuf,
+ DMA_FROM_DEVICE);
+ return ret;
+}
+
+static int st7586_mipi_dbi_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 tinydrm_device *tdev = fb->dev->dev_private;
+ struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+ struct drm_clip_rect clip;
+ int ret = 0;
+
+ 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;
+
+ 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);
+
+ ret = st7586_mipi_dbi_buf_copy(mipi->tx_buf, fb, &clip);
+ if (ret)
+ goto out_unlock;
+
+ /* NB: st7586_mipi_dbi_buf_copy() modifies clip */
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
+ (clip.x1 >> 8) & 0xFF, clip.x1 & 0xFF,
+ (clip.x2 >> 8) & 0xFF, (clip.x2 - 1) & 0xFF);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
+ (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF,
+ (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF);
+
+ ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
+ (u8 *)mipi->tx_buf,
+ (clip.x2 - clip.x1) * (clip.y2 - clip.y1));
+
+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 st7586_mipi_dbi_fb_funcs = {
+ .destroy = drm_fb_cma_destroy,
+ .create_handle = drm_fb_cma_create_handle,
+ .dirty = st7586_mipi_dbi_fb_dirty,
+};
+
+void st7586_mipi_dbi_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;
+
+ DRM_DEBUG_KMS("\n");
+
+ mipi->enabled = true;
+ if (fb)
+ fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+
+ tinydrm_enable_backlight(mipi->backlight);
+}
+
+static void st7586_mipi_dbi_blank(struct mipi_dbi *mipi)
+{
+ struct drm_device *drm = mipi->tinydrm.drm;
+ u16 height = drm->mode_config.min_height;
+ u16 width = (drm->mode_config.min_width + 2) / 3;
+ size_t len = width * height;
+
+ memset(mipi->tx_buf, 0, len);
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0,
+ (width >> 8) & 0xFF, (width - 1) & 0xFF);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0,
+ (height >> 8) & 0xFF, (height - 1) & 0xFF);
+ mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
+ (u8 *)mipi->tx_buf, len);
+}
+
+static void st7586_mipi_dbi_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");
+
+ mipi->enabled = false;
+
+ if (mipi->backlight)
+ tinydrm_disable_backlight(mipi->backlight);
+ else
+ st7586_mipi_dbi_blank(mipi);
+}
+
+static const u32 st7586_mipi_dbi_formats[] = {
+ DRM_FORMAT_RGB565,
+ DRM_FORMAT_XRGB8888,
+};
+
+static int st7586_mipi_dbi_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 + 2) / 3 * mode->hdisplay;
+ 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, &st7586_mipi_dbi_fb_funcs, driver);
+ if (ret)
+ return ret;
+
+ ret = tinydrm_display_pipe_init(tdev, pipe_funcs,
+ DRM_MODE_CONNECTOR_VIRTUAL,
+ st7586_mipi_dbi_formats,
+ ARRAY_SIZE(st7586_mipi_dbi_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 int st7586_init(struct mipi_dbi *mipi)
+{
+ struct tinydrm_device *tdev = &mipi->tinydrm;
+ struct device *dev = tdev->drm->dev;
+ u8 addr_mode;
+ int ret;
+
+ DRM_DEBUG_KMS("\n");
+
+ ret = regulator_enable(mipi->regulator);
+ if (ret) {
+ dev_err(dev, "Failed to enable regulator %d\n", ret);
+ return ret;
+ }
+
+ /* Avoid flicker by skipping setup if the bootloader has done it */
+ if (mipi_dbi_display_is_on(mipi))
+ return 0;
+
+ mipi_dbi_hw_reset(mipi);
+ ret = mipi_dbi_command(mipi, ST7586_AUTO_READ_CTRL, 0x9f);
+ if (ret) {
+ dev_err(dev, "Error sending command %d\n", ret);
+ regulator_disable(mipi->regulator);
+ return ret;
+ }
+
+ mipi_dbi_command(mipi, ST7586_OTP_RW_CTRL, 0x00);
+
+ msleep(10);
+
+ mipi_dbi_command(mipi, ST7586_OTP_READ);
+
+ msleep(20);
+
+ mipi_dbi_command(mipi, ST7586_OTP_CTRL_OUT);
+ mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
+
+ msleep(50);
+
+ mipi_dbi_command(mipi, ST7586_SET_VOP_OFFSET, 0x00);
+ mipi_dbi_command(mipi, ST7586_SET_VOP, 0xe3, 0x00);
+ mipi_dbi_command(mipi, ST7586_SET_BIAS_SYSTEM, 0x02);
+ mipi_dbi_command(mipi, ST7586_SET_BOOST_LEVEL, 0x04);
+ mipi_dbi_command(mipi, ST7586_ENABLE_ANALOG, 0x1d);
+ mipi_dbi_command(mipi, ST7586_SET_NLINE_INV, 0x00);
+ mipi_dbi_command(mipi, ST7586_DISP_MODE_GRAY);
+ mipi_dbi_command(mipi, ST7586_ENABLE_DDRAM, 0x02);
+
+ switch (mipi->rotation) {
+ default:
+ addr_mode = 0x00;
+ break;
+ case 90:
+ addr_mode = ST7586_DISP_CTRL_MY;
+ break;
+ case 180:
+ addr_mode = ST7586_DISP_CTRL_MX | ST7586_DISP_CTRL_MY;
+ break;
+ case 270:
+ addr_mode = ST7586_DISP_CTRL_MX;
+ break;
+ }
+ mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+ mipi_dbi_command(mipi, ST7586_SET_DISP_DUTY, 0x7f);
+ mipi_dbi_command(mipi, ST7586_SET_PART_DISP, 0xa0);
+ mipi_dbi_command(mipi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 0x00, 0x77);
+ mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
+
+ msleep(100);
+
+ mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
+
+ return 0;
+}
+
+static void st7586_fini(void *data)
+{
+ struct mipi_dbi *mipi = data;
+
+ DRM_DEBUG_KMS("\n");
+ regulator_disable(mipi->regulator);
+}
+
+static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = {
+ .enable = st7586_mipi_dbi_pipe_enable,
+ .disable = st7586_mipi_dbi_pipe_disable,
+ .update = tinydrm_display_pipe_update,
+ .prepare_fb = tinydrm_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode st7586_mode = {
+ TINYDRM_MODE(178, 128, 37, 27),
+};
+
+DEFINE_DRM_GEM_CMA_FOPS(st7586_fops);
+
+static struct drm_driver st7586_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
+ DRIVER_ATOMIC,
+ .fops = &st7586_fops,
+ TINYDRM_GEM_DRIVER_OPS,
+ .lastclose = tinydrm_lastclose,
+ .debugfs_init = mipi_dbi_debugfs_init,
+ .name = "st7586",
+ .desc = "Sitronix ST7586",
+ .date = "20170801",
+ .major = 1,
+ .minor = 0,
+};
+
+static const struct of_device_id st7586_of_match[] = {
+ { .compatible = "lego,ev3-lcd" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, st7586_of_match);
+
+static const struct spi_device_id st7586_id[] = {
+ { "ev3-lcd", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(spi, st7586_id);
+
+static int st7586_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct tinydrm_device *tdev;
+ struct mipi_dbi *mipi;
+ struct gpio_desc *dc;
+ u32 rotation = 0;
+ int ret;
+
+ mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
+ if (!mipi)
+ return -ENOMEM;
+
+ mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(mipi->reset)) {
+ dev_err(dev, "Failed to get gpio 'reset'\n");
+ return PTR_ERR(mipi->reset);
+ }
+
+ dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(dc)) {
+ dev_err(dev, "Failed to get gpio 'dc'\n");
+ return PTR_ERR(dc);
+ }
+
+ mipi->regulator = devm_regulator_get(dev, "power");
+ if (IS_ERR(mipi->regulator))
+ return PTR_ERR(mipi->regulator);
+
+ mipi->backlight = tinydrm_of_find_backlight(dev);
+ if (IS_ERR(mipi->backlight))
+ return PTR_ERR(mipi->backlight);
+
+ device_property_read_u32(dev, "rotation", &rotation);
+
+ ret = mipi_dbi_spi_init(spi, mipi, dc);
+ if (ret)
+ return ret;
+
+ /*
+ * we are using 8-bit data, so we are not actually swapping anything,
+ * but setting mipi->swap_bytes makes mipi_dbi_typec3_command() do the
+ * right thing and not use 16-bit transfers (which results in swapped
+ * bytes on little-endian systems and causes out of order data to be
+ * sent to the display).
+ */
+ mipi->swap_bytes = true;
+
+ ret = st7586_mipi_dbi_init(&spi->dev, mipi, &st7586_pipe_funcs,
+ &st7586_driver, &st7586_mode, rotation);
+ if (ret)
+ return ret;
+
+ ret = st7586_init(mipi);
+ if (ret)
+ return ret;
+
+ /* use devres to fini after drm unregister (drv->remove is before) */
+ ret = devm_add_action(dev, st7586_fini, mipi);
+ if (ret) {
+ st7586_fini(mipi);
+ return ret;
+ }
+
+ tdev = &mipi->tinydrm;
+
+ ret = devm_tinydrm_register(tdev);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, mipi);
+
+ DRM_DEBUG_DRIVER("Initialized %s:%s @%uMHz on minor %d\n",
+ tdev->drm->driver->name, dev_name(dev),
+ spi->max_speed_hz / 1000000,
+ tdev->drm->primary->index);
+
+ return 0;
+}
+
+static void st7586_shutdown(struct spi_device *spi)
+{
+ struct mipi_dbi *mipi = spi_get_drvdata(spi);
+
+ tinydrm_shutdown(&mipi->tinydrm);
+}
+
+static int __maybe_unused st7586_pm_suspend(struct device *dev)
+{
+ struct mipi_dbi *mipi = dev_get_drvdata(dev);
+ int ret;
+
+ ret = tinydrm_suspend(&mipi->tinydrm);
+ if (ret)
+ return ret;
+
+ st7586_fini(mipi);
+
+ return 0;
+}
+
+static int __maybe_unused st7586_pm_resume(struct device *dev)
+{
+ struct mipi_dbi *mipi = dev_get_drvdata(dev);
+ int ret;
+
+ ret = st7586_init(mipi);
+ if (ret)
+ return ret;
+
+ return tinydrm_resume(&mipi->tinydrm);
+}
+
+static const struct dev_pm_ops st7586_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(st7586_pm_suspend, st7586_pm_resume)
+};
+
+static struct spi_driver st7586_spi_driver = {
+ .driver = {
+ .name = "st7586",
+ .owner = THIS_MODULE,
+ .of_match_table = st7586_of_match,
+ .pm = &st7586_pm_ops,
+ },
+ .id_table = st7586_id,
+ .probe = st7586_probe,
+ .shutdown = st7586_shutdown,
+};
+module_spi_driver(st7586_spi_driver);
+
+MODULE_DESCRIPTION("Sitronix ST7586 DRM driver");
+MODULE_AUTHOR("David Lechner <david@lechnology.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/drm/tinydrm/st7586.h b/include/drm/tinydrm/st7586.h
new file mode 100644
index 0000000..18fb56b
--- /dev/null
+++ b/include/drm/tinydrm/st7586.h
@@ -0,0 +1,34 @@
+/*
+ * ST7586 LCD controller
+ *
+ * Copyright (C) 2017 David Lechner <david@lechnology.com>
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_ST7856_H
+#define __LINUX_ST7856_H
+
+#define ST7586_DISP_MODE_GRAY 0x38
+#define ST7586_DISP_MODE_MONO 0x39
+#define ST7586_ENABLE_DDRAM 0x3a
+#define ST7586_SET_DISP_DUTY 0xb0
+#define ST7586_SET_PART_DISP 0xb4
+#define ST7586_SET_NLINE_INV 0xb5
+#define ST7586_SET_VOP 0xc0
+#define ST7586_SET_BIAS_SYSTEM 0xc3
+#define ST7586_SET_BOOST_LEVEL 0xc4
+#define ST7586_SET_VOP_OFFSET 0xc7
+#define ST7586_ENABLE_ANALOG 0xd0
+#define ST7586_AUTO_READ_CTRL 0xd7
+#define ST7586_OTP_RW_CTRL 0xe0
+#define ST7586_OTP_CTRL_OUT 0xe1
+#define ST7586_OTP_READ 0xe3
+
+#define ST7586_DISP_CTRL_MX BIT(6)
+#define ST7586_DISP_CTRL_MY BIT(7)
+
+#endif /* __LINUX_ST7856_H */
--
2.7.4
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