[PATCH 28/39] drm/bridge: imx: Add NXP i.MX95 pixel link support
Frank Li
Frank.li at nxp.com
Mon Oct 13 12:10:51 PDT 2025
On Sat, Oct 11, 2025 at 06:51:43PM +0200, Marek Vasut wrote:
> From: Liu Ying <victor.liu at nxp.com>
>
> Add NXP i.MX95 pixel link bridge support.
>
> Signed-off-by: Marek Vasut <marek.vasut at mailbox.org>
> Signed-off-by: Liu Ying <victor.liu at nxp.com>
> Reviewed-by: Sandor Yu <Sandor.yu at nxp.com>
> ---
> Cc: Abel Vesa <abelvesa at kernel.org>
> Cc: Conor Dooley <conor+dt at kernel.org>
> Cc: Fabio Estevam <festevam at gmail.com>
> Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
> Cc: Laurent Pinchart <Laurent.pinchart at ideasonboard.com>
> Cc: Liu Ying <victor.liu at nxp.com>
> Cc: Lucas Stach <l.stach at pengutronix.de>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Pengutronix Kernel Team <kernel at pengutronix.de>
> Cc: Rob Herring <robh at kernel.org>
> Cc: Shawn Guo <shawnguo at kernel.org>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> Cc: devicetree at vger.kernel.org
> Cc: dri-devel at lists.freedesktop.org
> Cc: imx at lists.linux.dev
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-clk at vger.kernel.org
> ---
> drivers/gpu/drm/bridge/imx/Kconfig | 9 +
> drivers/gpu/drm/bridge/imx/Makefile | 1 +
> drivers/gpu/drm/bridge/imx/imx95-pixel-link.c | 184 ++++++++++++++++++
> 3 files changed, 194 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/imx/imx95-pixel-link.c
>
> diff --git a/drivers/gpu/drm/bridge/imx/Kconfig b/drivers/gpu/drm/bridge/imx/Kconfig
> index 3e1b1d825d7bf..8baa335deac49 100644
> --- a/drivers/gpu/drm/bridge/imx/Kconfig
> +++ b/drivers/gpu/drm/bridge/imx/Kconfig
> @@ -97,4 +97,13 @@ config DRM_IMX95_PIXEL_INTERLEAVER
> Choose this to enable pixel interleaver found in NXP i.MX95
> processors.
>
> +config DRM_IMX95_PIXEL_LINK
> + tristate "NXP i.MX95 display pixel link"
> + depends on OF && MFD_SYSCON
> + select DRM_KMS_HELPER
> + select REGMAP_MMIO
> + help
> + Choose this to enable display pixel link found in NXP i.MX95
> + processors.
> +
> endif # ARCH_MXC || COMPILE_TEST
> diff --git a/drivers/gpu/drm/bridge/imx/Makefile b/drivers/gpu/drm/bridge/imx/Makefile
> index 583054c70f002..b6b2e1bc8d4bd 100644
> --- a/drivers/gpu/drm/bridge/imx/Makefile
> +++ b/drivers/gpu/drm/bridge/imx/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o
> obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK_TO_DPI) += imx8qxp-pxl2dpi.o
> obj-$(CONFIG_DRM_IMX93_MIPI_DSI) += imx93-mipi-dsi.o
> obj-$(CONFIG_DRM_IMX95_PIXEL_INTERLEAVER) += imx95-pixel-interleaver.o
> +obj-$(CONFIG_DRM_IMX95_PIXEL_LINK) += imx95-pixel-link.o
> diff --git a/drivers/gpu/drm/bridge/imx/imx95-pixel-link.c b/drivers/gpu/drm/bridge/imx/imx95-pixel-link.c
> new file mode 100644
> index 0000000000000..747d2d77b59ef
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/imx/imx95-pixel-link.c
> @@ -0,0 +1,184 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +/*
> + * Copyright 2023 NXP
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/media-bus-format.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drm_atomic_state_helper.h>
> +#include <drm/drm_bridge.h>
> +
> +#define CTRL 0x8
register name too short
> +#define PL_VALID(n) BIT(1 + 4 * (n))
> +#define PL_ENABLE(n) BIT(4 * (n))
> +
> +#define OUT_ENDPOINTS 2
> +
> +#define DRIVER_NAME "imx95-pixel-link"
> +
> +struct imx95_pixel_link_bridge {
> + struct drm_bridge bridge;
> + struct drm_bridge *next_bridge;
> + struct device *dev;
> + struct regmap *regmap;
> + u8 stream_id;
> +};
> +
> +static int imx95_pixel_link_bridge_attach(struct drm_bridge *bridge,
> + struct drm_encoder *encoder,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct imx95_pixel_link_bridge *pl = bridge->driver_private;
> +
> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> + dev_err(pl->dev, "do not support creating a drm_connector\n");
> + return -EINVAL;
> + }
> +
> + return drm_bridge_attach(encoder, pl->next_bridge, bridge,
> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> +}
> +
> +static void imx95_pixel_link_bridge_disable(struct drm_bridge *bridge)
> +{
> + struct imx95_pixel_link_bridge *pl = bridge->driver_private;
> + unsigned int id = pl->stream_id;
> +
> + regmap_update_bits(pl->regmap, CTRL, PL_ENABLE(id), 0);
> + regmap_update_bits(pl->regmap, CTRL, PL_VALID(id), 0);
> +}
> +
> +static void imx95_pixel_link_bridge_enable(struct drm_bridge *bridge)
> +{
> + struct imx95_pixel_link_bridge *pl = bridge->driver_private;
> + unsigned int id = pl->stream_id;
> +
> + regmap_update_bits(pl->regmap, CTRL, PL_VALID(id), PL_VALID(id));
> + regmap_update_bits(pl->regmap, CTRL, PL_ENABLE(id), PL_ENABLE(id));
> +}
> +
> +static u32 *
> +imx95_pixel_link_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state,
> + u32 output_fmt,
> + unsigned int *num_input_fmts)
> +{
> + u32 *input_fmts;
> +
> + if (output_fmt != MEDIA_BUS_FMT_RGB888_1X36_CPADLO &&
> + output_fmt != MEDIA_BUS_FMT_FIXED)
> + return NULL;
> +
> + *num_input_fmts = 1;
> +
> + input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
> + if (!input_fmts)
> + return NULL;
> +
> + input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
> +
> + return input_fmts;
> +}
> +
> +static const struct drm_bridge_funcs imx95_pixel_link_bridge_funcs = {
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .attach = imx95_pixel_link_bridge_attach,
> + .disable = imx95_pixel_link_bridge_disable,
> + .enable = imx95_pixel_link_bridge_enable,
> + .atomic_get_input_bus_fmts =
> + imx95_pixel_link_bridge_atomic_get_input_bus_fmts,
> +};
> +
> +static int imx95_pixel_link_bridge_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *remote, *np = dev->of_node;
> + struct imx95_pixel_link_bridge *pl;
> + int i, ret;
> +
> + pl = devm_drm_bridge_alloc(dev, struct imx95_pixel_link_bridge, bridge,
> + &imx95_pixel_link_bridge_funcs);
> + if (IS_ERR(pl))
> + return PTR_ERR(pl);
> +
> + pl->dev = dev;
> + platform_set_drvdata(pdev, pl);
> +
> + pl->regmap = syscon_regmap_lookup_by_phandle(np, "fsl,syscon");
> + if (IS_ERR(pl->regmap))
> + return dev_err_probe(dev, PTR_ERR(pl->regmap), "failed to get regmap\n");
> +
> + ret = of_property_read_u8(np, "fsl,dc-stream-id", &pl->stream_id);
> + if (ret)
> + return dev_err_probe(dev, ret, "failed to get stream index\n");
> +
> + pl->bridge.driver_private = pl;
> + pl->bridge.of_node = of_graph_get_port_by_id(np, 0);
> + if (!pl->bridge.of_node)
> + return dev_err_probe(dev, -ENODEV, "failed to get port at 0\n");
> + of_node_put(pl->bridge.of_node);
this put should be in driver remove function.
> +
> + for (i = 0; i < OUT_ENDPOINTS; i++) {
> + remote = of_graph_get_remote_node(np, 1, i);
> + if (!remote) {
> + dev_dbg(dev, "no remote node for port at 1 ep%u\n", i);
> + continue;
> + }
> +
> + pl->next_bridge = of_drm_find_bridge(remote);
> + if (!pl->next_bridge) {
> + dev_dbg(dev, "failed to find next bridge for port at 1 ep%u\n", i);
> + of_node_put(remote);
> + return -EPROBE_DEFER;
> + }
> +
> + of_node_put(remote);
> +
> + drm_bridge_add(&pl->bridge);
> +
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static void imx95_pixel_link_bridge_remove(struct platform_device *pdev)
> +{
> + struct imx95_pixel_link_bridge *pl = platform_get_drvdata(pdev);
> +
> + drm_bridge_remove(&pl->bridge);
> +}
> +
> +static const struct of_device_id imx95_pixel_link_bridge_dt_ids[] = {
> + { .compatible = "fsl,imx95-dc-pixel-link", },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, imx95_pixel_link_bridge_dt_ids);
> +
> +static struct platform_driver imx95_pixel_link_bridge_driver = {
> + .probe = imx95_pixel_link_bridge_probe,
> + .remove = imx95_pixel_link_bridge_remove,
> + .driver = {
> + .of_match_table = imx95_pixel_link_bridge_dt_ids,
> + .name = DRIVER_NAME,
> + },
> +};
> +
> +module_platform_driver(imx95_pixel_link_bridge_driver);
> +
> +MODULE_DESCRIPTION("i.MX95 display pixel link bridge driver");
> +MODULE_AUTHOR("NXP Semiconductor");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
Drop
> --
> 2.51.0
>
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