drm/panel: ilitek-ili9881c: Allow configuration of the number of lanes

Not all panels use all 4 data lanes, so allow configuration based
on the compatible string.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250608142908.54121-2-marek.vasut+renesas@mailbox.org

Author: Marek Vasut

drivers/gpu/drm/panel/panel-ilitek-ili9881c.c

@@ -43,6 +43,7 @@ struct ili9881c_desc {
 	const struct drm_display_mode *mode;
 	const unsigned long mode_flags;
 	u8 default_address_mode;
+	unsigned int lanes;
 };
 
 struct ili9881c {
@@ -1548,7 +1549,7 @@ static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
 
 	dsi->mode_flags = ctx->desc->mode_flags;
 	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->lanes = 4;
+	dsi->lanes = ctx->desc->lanes;
 
 	return mipi_dsi_attach(dsi);
 }
@@ -1566,13 +1567,15 @@ static const struct ili9881c_desc lhr050h41_desc = {
 	.init_length = ARRAY_SIZE(lhr050h41_init),
 	.mode = &lhr050h41_default_mode,
 	.mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
+	.lanes = 4,
 };
 
 static const struct ili9881c_desc k101_im2byl02_desc = {
 	.init = k101_im2byl02_init,
 	.init_length = ARRAY_SIZE(k101_im2byl02_init),
 	.mode = &k101_im2byl02_default_mode,
 	.mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
+	.lanes = 4,
 };
 
 static const struct ili9881c_desc kd050hdfia020_desc = {
@@ -1598,6 +1601,7 @@ static const struct ili9881c_desc w552946aba_desc = {
 	.mode = &w552946aba_default_mode,
 	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 		      MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET,
+	.lanes = 4,
 };
 
 static const struct ili9881c_desc am8001280g_desc = {