summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorSimon Glass <sjg@chromium.org>2015-03-26 09:29:28 -0600
committerSimon Glass <sjg@chromium.org>2015-04-18 11:11:14 -0600
commita274e9cac55de3c8ca4e877912a260fb646df38d (patch)
treead56dbcf144ecbdb58f40bea81b1b88af9dad7b5
parent452f5487536e9d5bf9bb7e515368f6deac7d61f5 (diff)
downloadu-boot-imx-a274e9cac55de3c8ca4e877912a260fb646df38d.zip
u-boot-imx-a274e9cac55de3c8ca4e877912a260fb646df38d.tar.gz
u-boot-imx-a274e9cac55de3c8ca4e877912a260fb646df38d.tar.bz2
dm: x86: Add a uclass for an Low Pin Count (LPC) device
On x86 systems this device is commonly used to provide legacy port access. It is sort-of a replacement for the old ISA bus. Add a uclass for this, and allow it to have child devices. Signed-off-by: Simon Glass <sjg@chromium.org>
-rw-r--r--arch/x86/lib/Makefile1
-rw-r--r--arch/x86/lib/lpc-uclass.c28
-rw-r--r--include/dm/uclass-id.h1
3 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
index fe022f6..6c571dd 100644
--- a/arch/x86/lib/Makefile
+++ b/arch/x86/lib/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_HAVE_FSP) += cmd_hob.o
obj-y += gcc.o
obj-y += init_helpers.o
obj-y += interrupts.o
+obj-y += lpc-uclass.o
obj-y += cmd_mtrr.o
obj-$(CONFIG_SYS_PCAT_INTERRUPTS) += pcat_interrupts.o
obj-$(CONFIG_SYS_PCAT_TIMER) += pcat_timer.o
diff --git a/arch/x86/lib/lpc-uclass.c b/arch/x86/lib/lpc-uclass.c
new file mode 100644
index 0000000..6aeb4d4
--- /dev/null
+++ b/arch/x86/lib/lpc-uclass.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/root.h>
+
+static int lpc_uclass_post_bind(struct udevice *bus)
+{
+ /*
+ * Scan the device tree for devices
+ *
+ * Before relocation, only bind devices marked for pre-relocation
+ * use.
+ */
+ return dm_scan_fdt_node(bus, gd->fdt_blob, bus->of_offset,
+ gd->flags & GD_FLG_RELOC ? false : true);
+}
+
+UCLASS_DRIVER(lpc) = {
+ .id = UCLASS_LPC,
+ .name = "lpc",
+ .post_bind = lpc_uclass_post_bind,
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index 84a6955..79b51d3 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -39,6 +39,7 @@ enum uclass_id {
UCLASS_PCI_GENERIC, /* Generic PCI bus device */
UCLASS_PCH, /* x86 platform controller hub */
UCLASS_ETH, /* Ethernet device */
+ UCLASS_LPC, /* x86 'low pin count' interface */
UCLASS_COUNT,
UCLASS_INVALID = -1,