// SPDX-License-Identifier: GPL-2.0 /* * Panel driver for the ARM Versatile family reference designs from * ARM Limited. * * Author: * Linus Walleij <[email protected]> * * On the Versatile AB, these panels come mounted on daughterboards * named "IB1" or "IB2" (Interface Board 1 & 2 respectively.) They * are documented in ARM DUI 0225D Appendix C and D. These daughter * boards support TFT display panels. * * - The IB1 is a passive board where the display connector defines a * few wires for encoding the display type for autodetection, * suitable display settings can then be looked up from this setting. * The magic bits can be read out from the system controller. * * - The IB2 is a more complex board intended for GSM phone development * with some logic and a control register, which needs to be accessed * and the board display needs to be turned on explicitly. * * On the Versatile PB, a special CLCD adaptor board is available * supporting the same displays as the Versatile AB, plus one more * Epson QCIF display. * */ #include <linux/bitops.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/mfd/syscon.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <video/of_videomode.h> #include <video/videomode.h> #include <drm/drm_modes.h> #include <drm/drm_panel.h> /* * This configuration register in the Versatile and RealView * family is uniformly present but appears more and more * unutilized starting with the RealView series. */ #define SYS_CLCD … /* The Versatile can detect the connected panel type */ #define SYS_CLCD_CLCDID_MASK … #define SYS_CLCD_ID_SANYO_3_8 … #define SYS_CLCD_ID_SHARP_8_4 … #define SYS_CLCD_ID_EPSON_2_2 … #define SYS_CLCD_ID_SANYO_2_5 … #define SYS_CLCD_ID_VGA … /* IB2 control register for the Versatile daughterboard */ #define IB2_CTRL … #define IB2_CTRL_LCD_SD … #define IB2_CTRL_LCD_BL_ON … #define IB2_CTRL_LCD_MASK … /** * struct versatile_panel_type - lookup struct for the supported panels */ struct versatile_panel_type { … }; /** * struct versatile_panel - state container for the Versatile panels */ struct versatile_panel { … }; static const struct versatile_panel_type versatile_panels[] = …; static inline struct versatile_panel * to_versatile_panel(struct drm_panel *panel) { … } static int versatile_panel_disable(struct drm_panel *panel) { … } static int versatile_panel_enable(struct drm_panel *panel) { … } static int versatile_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector) { … } static const struct drm_panel_funcs versatile_panel_drm_funcs = …; static int versatile_panel_probe(struct platform_device *pdev) { … } static const struct of_device_id versatile_panel_match[] = …; MODULE_DEVICE_TABLE(of, versatile_panel_match); static struct platform_driver versatile_panel_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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