MLK-24334-1: drm/panel: Add support for WKS-101WX001-WCT parallel display

This patch adds WKS 101WX001-WCT panel driver, which is a WXGA
(1280x800) RGB 24-bit parallel LCD with touch.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>

drivers/gpu/drm/panel/Kconfig

@@ -499,4 +499,13 @@ config DRM_PANEL_XINPENG_XPP055C272
 	  Say Y here if you want to enable support for the Xinpeng
 	  XPP055C272 controller for 720x1280 LCD panels with MIPI/RGB/SPI
 	  system interfaces.
+config DRM_PANEL_WKS_101WX001
+	tristate "WKS 101WX001 parallel LCD"
+	depends on OF
+	depends on BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+	help
+	  Say Y here if you want to enable support for the WKS
+	  101WX001 controller for 1280x800 LCD panel
+
 endmenu

drivers/gpu/drm/panel/Makefile

@@ -53,3 +53,4 @@ obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
 obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
 obj-$(CONFIG_DRM_PANEL_VISIONOX_RM69299) += panel-visionox-rm69299.o
 obj-$(CONFIG_DRM_PANEL_XINPENG_XPP055C272) += panel-xinpeng-xpp055c272.o
+obj-$(CONFIG_DRM_PANEL_WKS_101WX001) += panel-wks-101wx001.o

drivers/gpu/drm/panel/panel-wks-101wx001.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * WKS 101WX001-WCT parallel LCD panel driver
+ *
+ * Copyright 2020 NXP
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/display_timing.h>
+#include <video/videomode.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_device.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+struct wks_panel {
+	struct drm_panel panel;
+	struct gpio_desc *bl_ctr;
+	struct regulator *vcc;
+
+	bool prepared;
+	bool enabled;
+};
+
+static const struct drm_display_mode default_mode = {
+	.clock = 71100,
+	.hdisplay = 1280,
+	.hsync_start = 1280 + 70,
+	.hsync_end = 1280 + 70 + 10,
+	.htotal = 1280 + 70 + 10 + 80,
+	.vdisplay = 800,
+	.vsync_start = 800 + 10,
+	.vsync_end = 800 + 10 + 3,
+	.vtotal = 800 + 10 + 3 + 10,
+	.width_mm = 217,
+	.height_mm = 135,
+	.flags = DRM_MODE_FLAG_NHSYNC |
+		 DRM_MODE_FLAG_NVSYNC,
+};
+
+static const u32 wks_bus_formats[] = {
+	MEDIA_BUS_FMT_RGB666_1X18,
+};
+
+static const u32 wks_bus_flags = DRM_BUS_FLAG_DE_HIGH |
+				 DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
+
+static inline struct wks_panel *to_wks_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct wks_panel, panel);
+}
+
+static int wks_panel_prepare(struct drm_panel *panel)
+{
+	struct wks_panel *p = to_wks_panel(panel);
+	int err;
+
+	if (p->prepared)
+		return 0;
+
+	err = regulator_enable(p->vcc);
+	if (err < 0) {
+		dev_err(panel->dev, "failed to enable vcc: %d\n", err);
+		return err;
+	}
+
+	p->prepared = true;
+
+	return 0;
+}
+
+static int wks_panel_enable(struct drm_panel *panel)
+{
+	struct wks_panel *p = to_wks_panel(panel);
+
+	if (p->enabled)
+		return 0;
+
+	gpiod_set_value_cansleep(p->bl_ctr, 1);
+
+	p->enabled = true;
+
+	return 0;
+}
+
+
+static int wks_panel_disable(struct drm_panel *panel)
+{
+	struct wks_panel *p = to_wks_panel(panel);
+
+	if (!p->enabled)
+		return 0;
+
+	gpiod_set_value_cansleep(p->bl_ctr, 0);
+
+	p->enabled = false;
+
+	return 0;
+}
+
+static int wks_panel_unprepare(struct drm_panel *panel)
+{
+	struct wks_panel *p = to_wks_panel(panel);
+
+	if (!p->prepared)
+		return 0;
+
+	regulator_disable(p->vcc);
+
+	p->prepared = false;
+
+	return 0;
+}
+
+static int wks_panel_get_modes(struct drm_panel *panel,
+			       struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &default_mode);
+	if (!mode) {
+		DRM_DEV_ERROR(panel->dev, "failed to add mode %ux%ux@%d\n",
+			      default_mode.hdisplay, default_mode.vdisplay,
+			      drm_mode_vrefresh(&default_mode));
+		return -ENOMEM;
+	}
+
+	drm_mode_set_name(mode);
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+	DRM_DEV_DEBUG_DRIVER(panel->dev, "Mode flags: 0x%08X", mode->flags);
+
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	connector->display_info.bus_flags = wks_bus_flags;
+
+	drm_display_info_set_bus_formats(&connector->display_info,
+					 wks_bus_formats,
+					 ARRAY_SIZE(wks_bus_formats));
+	return 1;
+
+}
+
+static const struct drm_panel_funcs wks_panel_funcs = {
+	.prepare = wks_panel_prepare,
+	.enable = wks_panel_enable,
+	.disable = wks_panel_disable,
+	.unprepare = wks_panel_unprepare,
+	.get_modes = wks_panel_get_modes,
+};
+
+static int wks_panel_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct wks_panel *panel;
+	int err;
+
+	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
+	if (!panel)
+		return -ENOMEM;
+
+	panel->vcc = devm_regulator_get(dev, "vcc");
+	if (IS_ERR(panel->vcc))
+		return PTR_ERR(panel->vcc);
+
+	panel->bl_ctr = devm_gpiod_get(dev, "blctr", GPIOD_OUT_LOW);
+	if (IS_ERR(panel->bl_ctr)) {
+		err = PTR_ERR(panel->bl_ctr);
+		dev_err(dev, "Failed to get blctr gpio (%d)\n", err);
+		return err;
+	}
+
+	drm_panel_init(&panel->panel,
+		       dev,
+		       &wks_panel_funcs,
+		       DRM_MODE_CONNECTOR_DPI);
+
+	drm_panel_add(&panel->panel);
+	dev_set_drvdata(dev, panel);
+
+	return 0;
+}
+
+static int wks_panel_remove(struct platform_device *pdev)
+{
+	struct wks_panel *p = dev_get_drvdata(&pdev->dev);
+
+	drm_panel_remove(&p->panel);
+
+	wks_panel_disable(&p->panel);
+
+	return 0;
+}
+
+static void wks_panel_shutdown(struct platform_device *pdev)
+{
+	struct wks_panel *p = dev_get_drvdata(&pdev->dev);
+
+	wks_panel_disable(&p->panel);
+}
+
+static const struct of_device_id wks_of_match[] = {
+	{ .compatible = "wks,101wx001", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, wks_of_match);
+
+static struct platform_driver wks_panel_platform_driver = {
+	.driver = {
+		.name = "panel-wks-101wx001",
+		.of_match_table = wks_of_match,
+	},
+	.probe = wks_panel_probe,
+	.remove = wks_panel_remove,
+	.shutdown = wks_panel_shutdown,
+};
+module_platform_driver(wks_panel_platform_driver);
+
+MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
+MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
+MODULE_LICENSE("GPL v2");