1 // SPDX-License-Identifier: GPL-2.0-only
3  * OF helpers for parsing display timings
16  * parse_timing_property - parse timing_entry from device_node
34 		return -EINVAL;  in parse_timing_property()
39 		ret = of_property_read_u32(np, name, &result->typ);  in parse_timing_property()
40 		result->min = result->typ;  in parse_timing_property()
41 		result->max = result->typ;  in parse_timing_property()
43 		ret = of_property_read_u32_array(np, name, &result->min, cells);  in parse_timing_property()
46 		return -EINVAL;  in parse_timing_property()
53  * of_parse_display_timing - parse display_timing entry from device_node
65 	ret |= parse_timing_property(np, "hback-porch", &dt->hback_porch);  in of_parse_display_timing()
66 	ret |= parse_timing_property(np, "hfront-porch", &dt->hfront_porch);  in of_parse_display_timing()
67 	ret |= parse_timing_property(np, "hactive", &dt->hactive);  in of_parse_display_timing()
68 	ret |= parse_timing_property(np, "hsync-len", &dt->hsync_len);  in of_parse_display_timing()
69 	ret |= parse_timing_property(np, "vback-porch", &dt->vback_porch);  in of_parse_display_timing()
70 	ret |= parse_timing_property(np, "vfront-porch", &dt->vfront_porch);  in of_parse_display_timing()
71 	ret |= parse_timing_property(np, "vactive", &dt->vactive);  in of_parse_display_timing()
72 	ret |= parse_timing_property(np, "vsync-len", &dt->vsync_len);  in of_parse_display_timing()
73 	ret |= parse_timing_property(np, "clock-frequency", &dt->pixelclock);  in of_parse_display_timing()
75 	dt->flags = 0;  in of_parse_display_timing()
76 	if (!of_property_read_u32(np, "vsync-active", &val))  in of_parse_display_timing()
77 		dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH :  in of_parse_display_timing()
79 	if (!of_property_read_u32(np, "hsync-active", &val))  in of_parse_display_timing()
80 		dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH :  in of_parse_display_timing()
82 	if (!of_property_read_u32(np, "de-active", &val))  in of_parse_display_timing()
83 		dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH :  in of_parse_display_timing()
85 	if (!of_property_read_u32(np, "pixelclk-active", &val))  in of_parse_display_timing()
86 		dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE :  in of_parse_display_timing()
89 	if (!of_property_read_u32(np, "syncclk-active", &val))  in of_parse_display_timing()
90 		dt->flags |= val ? DISPLAY_FLAGS_SYNC_POSEDGE :  in of_parse_display_timing()
92 	else if (dt->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |  in of_parse_display_timing()
94 		dt->flags |= dt->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE ?  in of_parse_display_timing()
99 		dt->flags |= DISPLAY_FLAGS_INTERLACED;  in of_parse_display_timing()
101 		dt->flags |= DISPLAY_FLAGS_DOUBLESCAN;  in of_parse_display_timing()
103 		dt->flags |= DISPLAY_FLAGS_DOUBLECLK;  in of_parse_display_timing()
107 		return -EINVAL;  in of_parse_display_timing()
114  * of_get_display_timing - parse a display_timing entry
126 		return -EINVAL;  in of_get_display_timing()
130 		return -ENOENT;  in of_get_display_timing()
141  * of_get_display_timings - parse all display_timing entries from a device_node
154 	timings_np = of_get_child_by_name(np, "display-timings");  in of_get_display_timings()
156 		pr_err("%pOF: could not find display-timings node\n", np);  in of_get_display_timings()
166 	entry = of_parse_phandle(timings_np, "native-mode", 0);  in of_get_display_timings()
180 	disp->num_timings = of_get_child_count(timings_np);  in of_get_display_timings()
181 	if (disp->num_timings == 0) {  in of_get_display_timings()
183 		pr_err("%pOF: no timings specified\n", np);  in of_get_display_timings()
187 	disp->timings = kcalloc(disp->num_timings,  in of_get_display_timings()
190 	if (!disp->timings) {  in of_get_display_timings()
191 		pr_err("%pOF: could not allocate timings array\n", np);  in of_get_display_timings()
195 	disp->num_timings = 0;  in of_get_display_timings()
196 	disp->native_mode = 0;  in of_get_display_timings()
216 				np, disp->num_timings + 1);  in of_get_display_timings()
222 			disp->native_mode = disp->num_timings;  in of_get_display_timings()
224 		disp->timings[disp->num_timings] = dt;  in of_get_display_timings()
225 		disp->num_timings++;  in of_get_display_timings()
234 	pr_debug("%pOF: got %d timings. Using timing #%d as default\n",  in of_get_display_timings()
235 		np, disp->num_timings,  in of_get_display_timings()
236 		disp->native_mode + 1);  in of_get_display_timings()