[PATCH 28/39] drm/bridge: imx: Add NXP i.MX95 pixel link support
Marek Vasut
marek.vasut at mailbox.org
Sat Oct 11 09:51:43 PDT 2025
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
+#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);
+
+ 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);
--
2.51.0
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