dm: extcon: add an uclass for extcon

Add a new simple uclass for extcon. Currently all setup is done
in the probe. Uclass struct and ops are empty for now.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/Kconfig

@@ -36,6 +36,8 @@ source "drivers/dfu/Kconfig"
 
 source "drivers/dma/Kconfig"
 
+source "drivers/extcon/Kconfig"
+
 source "drivers/fastboot/Kconfig"
 
 source "drivers/firmware/Kconfig"

drivers/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_$(SPL_TPL_)DM) += core/
 obj-$(CONFIG_$(SPL_TPL_)DMA) += dma/
 obj-$(CONFIG_$(SPL_TPL_)DMA_LEGACY) += dma/
 obj-$(CONFIG_$(SPL_TPL_)DFU) += dfu/
+obj-$(CONFIG_$(SPL_TPL_)EXTCON) += extcon/
 obj-$(CONFIG_$(SPL_TPL_)GPIO) += gpio/
 obj-$(CONFIG_$(SPL_TPL_)DRIVERS_MISC) += misc/
 obj-$(CONFIG_$(SPL_TPL_)SYSRESET) += sysreset/

drivers/extcon/Kconfig

@@ -0,0 +1,15 @@
+menu "Extcon Support"
+
+config EXTCON
+	bool "External Connector Class (extcon) support"
+	depends on DM
+	help
+	  Say Y here to enable external connector class (extcon) support.
+	  This allows monitoring external connectors and supports external
+	  connectors with multiple states; i.e., an extcon that may have
+	  multiple cables attached. For example, an external connector
+	  of a device may be used to connect an HDMI cable and a AC adaptor,
+	  and to host USB ports. Many of 30-pin connectors including PDMI
+	  are also good examples.
+
+endmenu

drivers/extcon/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+
+obj-$(CONFIG_EXTCON) += extcon-uclass.o

drivers/extcon/extcon-uclass.c

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#define LOG_CATEGORY UCLASS_EXTCON
+
+#include <common.h>
+#include <extcon.h>
+#include <dm.h>
+
+UCLASS_DRIVER(extcon) = {
+	.id			= UCLASS_EXTCON,
+	.name			= "extcon",
+	.per_device_plat_auto	= sizeof(struct extcon_uc_plat),
+};

include/dm/uclass-id.h

@@ -56,6 +56,7 @@ enum uclass_id {
 	UCLASS_EFI_MEDIA,	/* Devices provided by UEFI firmware */
 	UCLASS_ETH,		/* Ethernet device */
 	UCLASS_ETH_PHY,		/* Ethernet PHY device */
+	UCLASS_EXTCON,		/* External Connector Class */
 	UCLASS_FIRMWARE,	/* Firmware */
 	UCLASS_FPGA,		/* FPGA device */
 	UCLASS_FUZZING_ENGINE,	/* Fuzzing engine */

include/extcon.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#ifndef __EXTCON_H
+#define __EXTCON_H
+
+struct udevice;
+
+/**
+ * struct extcon_uc_plat - Platform data the uclass stores about each device
+ *
+ * To be filled
+ */
+struct extcon_uc_plat {
+};
+
+#endif