This enables support for simple bridges, i.e. bridges that can be used without initialization.
This is e.g. the case with bridges that have persistent configuration, the kernel has a full-fledged driver to configure the bridge and persist it. The bootloader then needs to do nothing more. Having such a transparent bridge allows reusing the kernel device tree without changing the graph specification. Signed-off-by: Ahmad Fatoum <[email protected]> --- .../video/display/bridge/simple-bridge.txt | 41 +++++++++++++ drivers/video/Kconfig | 7 +++ drivers/video/Makefile | 2 +- drivers/video/simple-bridge.c | 57 +++++++++++++++++++ 4 files changed, 106 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/video/display/bridge/simple-bridge.txt create mode 100644 drivers/video/simple-bridge.c diff --git a/Documentation/devicetree/bindings/video/display/bridge/simple-bridge.txt b/Documentation/devicetree/bindings/video/display/bridge/simple-bridge.txt new file mode 100644 index 000000000000..b1485569d992 --- /dev/null +++ b/Documentation/devicetree/bindings/video/display/bridge/simple-bridge.txt @@ -0,0 +1,41 @@ +Simple display bridge +===================== + +bridge node +----------- + +Required properties: + - compatible : "barebox,simple-bridge". + - #address-cells : must be <1> + - #size-cells : must be <0> + - video interfaces: Device node should contain two video interface port + nodes for input and output according to [1]. + - port@0 - bridge input + - port@1 - bridge output + +[1]: dts/Bindings/media/video-interfaces.txt + + +Example: + fpga-display-bridge@0 { + compatible = "barebox,simple-bridge"; + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + + port@0 { + reg = <0>; + + ch0_lcd_in: endpoint { + remote-endpoint = <¶llel_display_out>; + }; + }; + + port@1 { + reg = <1>; + + ch0_out: endpoint { + remote-endpoint = <&disp1_in>; + }; + }; + }; diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index a26bace176a1..b153978492a9 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -161,4 +161,11 @@ config DRIVER_VIDEO_SIMPLE_PANEL Linux Kernel implementation this one is able to understand display-timings nodes so that it's not necessary to keep a list of all known displays with their corresponding timings in barebox. + +config DRIVER_VIDEO_SIMPLE_BRIDGE + bool "Simple bridge support" + depends on OFTREE + help + This enables support for simple bridges, i.e. bridges that can be + used without initialization. endif diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 01fabe880920..2296c14ccc73 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -24,4 +24,4 @@ obj-$(CONFIG_DRIVER_VIDEO_IMX_IPUV3) += imx-ipu-v3/ obj-$(CONFIG_DRIVER_VIDEO_EFI_GOP) += efi_gop.o obj-$(CONFIG_DRIVER_VIDEO_FB_SSD1307) += ssd1307fb.o obj-$(CONFIG_BACKLIGHT_RAVE_SP) += rave-sp-backlight.o - +obj-$(CONFIG_DRIVER_VIDEO_SIMPLE_BRIDGE) += simple-bridge.o diff --git a/drivers/video/simple-bridge.c b/drivers/video/simple-bridge.c new file mode 100644 index 000000000000..0d6621df7b0c --- /dev/null +++ b/drivers/video/simple-bridge.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0-only +// SPDX-FileCopyright-Text: 2020 Pengutronix, Ahmad Fatoum <[email protected]> + +#include <common.h> +#include <init.h> +#include <driver.h> +#include <video/vpl.h> +#include <of_graph.h> + +enum { BRIDGE_INPUT_PORT = 0, BRIDGE_OUTPUT_PORT = 1 }; + +struct simple_bridge_priv { + struct device_d *dev; + struct vpl vpl; +}; + +static int simple_bridge_ioctl(struct vpl *vpl, unsigned int port, + unsigned int cmd, void *ptr) +{ + struct simple_bridge_priv *priv = container_of(vpl, struct simple_bridge_priv, vpl); + + dev_dbg(priv->dev, "ioctl(port=%d, cmd=0x%08x)\n", port, cmd); + + return vpl_ioctl(vpl, BRIDGE_OUTPUT_PORT, cmd, ptr); +} + +static int simple_bridge_probe(struct device_d *dev) +{ + struct simple_bridge_priv *priv; + struct device_node *port; + + priv = xzalloc(sizeof(*priv)); + priv->dev = dev; + + port = of_graph_get_port_by_id(dev->device_node, BRIDGE_OUTPUT_PORT); + if (!port) { + dev_err(dev, "No remote panel found\n"); + return -ENODEV; + } + + priv->vpl.node = dev->device_node; + priv->vpl.ioctl = simple_bridge_ioctl; + + return vpl_register(&priv->vpl); +} + +static const struct of_device_id __maybe_unused simple_bridge_match[] = { + { .compatible = "barebox,simple-bridge" }, + { /* sentinel */ }, +}; + +static struct driver_d simple_bridge_driver = { + .name = "simple-bridge", + .probe = simple_bridge_probe, + .of_compatible = DRV_OF_COMPAT(simple_bridge_match), +}; +device_platform_driver(simple_bridge_driver); -- 2.28.0 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
