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Subject答复: [PATCH v2 6/6] drm/panel: Add Ilitek IL I9341 DBI panel driver
Date
> +struct ili9341 {
> + struct drm_panel panel;
> + struct mipi_dsi_device *dsi;
> + const struct ili9341_pdata *pdata;
> +
> + struct gpio_desc *reset_gpiod;
> + u32 rotation;
> +};
> +

Hi Paul, you put the mipi_dsi_device inside the struct. I think it maybe not
a good idea. That means the panel has a MIPI-DSI interface but it doesn't
have actually.

> +static int ili9341_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device *dev = &dsi->dev;
> + struct ili9341 *priv;
> + int ret;
> +
> + /* See comment for mipi_dbi_spi_init() */
> + if (!dev->coherent_dma_mask) {
> + ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
> + if (ret) {
> + dev_warn(dev, "Failed to set dma mask %d\n", ret);
> + return ret;
> + }
> + }
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + mipi_dsi_set_drvdata(dsi, priv);
> + priv->dsi = dsi;
> +
> + device_property_read_u32(dev, "rotation", &priv->rotation);
> +
> + priv->pdata = device_get_match_data(dev);
> + if (!priv->pdata)
> + return -EINVAL;
> +
> + drm_panel_init(&priv->panel, dev, &ili9341_funcs,
> + DRM_MODE_CONNECTOR_DPI);
> +
> + priv->reset_gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(priv->reset_gpiod)) {
> + dev_err(dev, "Couldn't get our reset GPIO\n");
> + return PTR_ERR(priv->reset_gpiod);
> + }
> +
> + ret = drm_panel_of_backlight(&priv->panel);
> + if (ret < 0) {
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get backlight handle\n");
> + return ret;
> + }
> +
> + drm_panel_add(&priv->panel);
> +
> + dsi->bus_type = priv->pdata->bus_type;
> + dsi->lanes = priv->pdata->lanes;
> + dsi->format = MIPI_DSI_FMT_RGB565;
> +
> + ret = mipi_dsi_attach(dsi);
> + if (ret) {
> + dev_err(dev, "Failed to attach DSI panel\n");
> + goto err_panel_remove;
> + }
> +
> + ret = mipi_dsi_maybe_register_tiny_driver(dsi);
> + if (ret) {
> + dev_err(dev, "Failed to init TinyDRM driver\n");
> + goto err_mipi_dsi_detach;
> + }
> +
> + return 0;
> +
> +err_mipi_dsi_detach:
> + mipi_dsi_detach(dsi);
> +err_panel_remove:
> + drm_panel_remove(&priv->panel);
> + return ret;
> +}
> +
> +static int ili9341_remove(struct mipi_dsi_device *dsi)
> +{
> + struct ili9341 *priv = mipi_dsi_get_drvdata(dsi);
> +
> + mipi_dsi_detach(dsi);
> + drm_panel_remove(&priv->panel);
> +
> + drm_panel_disable(&priv->panel);
> + drm_panel_unprepare(&priv->panel);
> +
> + return 0;
> +}
> +
> +static const struct ili9341_pdata yx240qv29_pdata = {
> + .mode = { DRM_SIMPLE_MODE(240, 320, 37, 49) },
> + .width_mm = 0, // TODO
> + .height_mm = 0, // TODO
> + .bus_type = MIPI_DCS_BUS_TYPE_DBI_SPI_C3,
> + .lanes = 1,
> +};
> +
> +static const struct of_device_id ili9341_of_match[] = {
> + { .compatible = "adafruit,yx240qv29", .data = &yx240qv29_pdata },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ili9341_of_match);
> +
> +static struct mipi_dsi_driver ili9341_dsi_driver = {
> + .probe = ili9341_probe,
> + .remove = ili9341_remove,
> + .driver = {
> + .name = "ili9341-dsi",
> + .of_match_table = ili9341_of_match,
> + },
> +};
> +module_mipi_dsi_driver(ili9341_dsi_driver);

Again, you treat this driver as a mipi dsi driver but for a MIPI-DBI (I8080/SPI)
panel device. That will make developers confused.

Is it possible to just add a mipi_dbi_driver for I8080/SPI interface panel?
Thanks!


Best regards

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