[U-Boot] [PATCH v2 02/14] sysreset: add syscon-reboot driver

Álvaro Fernández Rojas
2017-04-15T22:03:54Z

Add a new sysreset driver based on linux/drivers/power/reset/syscon-reboot.c,
which provides a generic driver for platforms that only require writing a mask
to a regmap offset.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
v2: no changes

drivers/sysreset/Kconfig | 8 +++++
drivers/sysreset/Makefile | 1 +
drivers/sysreset/sysreset_syscon.c | 60 ++++++++++++++++++++++++++++++++++++++
3 files changed, 69 insertions(+)
create mode 100644 drivers/sysreset/sysreset_syscon.c

diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index 05a37b9..0946c9d 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -13,4 +13,12 @@ config SYSRESET
to effect a reset. The uclass will try all available drivers when
reset_walk() is called.

+config SYSRESET_SYSCON
+ bool "Enable support for mfd syscon reboot driver"
+ depends on SYSRESET
+ select REGMAP
+ select SYSCON
+ help
+ Description here.
+
endmenu
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 49b8bb6..1205f47 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_ARCH_SNAPDRAGON) += sysreset_snapdragon.o
obj-$(CONFIG_ARCH_STI) += sysreset_sti.o
obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o
obj-$(CONFIG_ARCH_ASPEED) += sysreset_ast.o
+obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
diff --git a/drivers/sysreset/sysreset_syscon.c b/drivers/sysreset/sysreset_syscon.c
new file mode 100644
index 0000000..61aeb1d
--- /dev/null
+++ b/drivers/sysreset/sysreset_syscon.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/drivers/power/reset/syscon-reboot.c:
+ * Copyright (C) 2013, Applied Micro Circuits Corporation
+ * Author: Feng Kan <fkan@apm.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <regmap.h>
+#include <syscon.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static int syscon_reboot_request(struct udevice *dev, enum sysreset_t type)
+{
+ struct udevice *syscon;
+ struct regmap *regmap;
+ unsigned int offset, mask;
+ int err;
+
+ err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
+ "regmap", &syscon);
+ if (err) {
+ error("unable to find syscon device\n");
+ return err;
+ }
+
+ regmap = syscon_get_regmap(syscon);
+ if (!regmap) {
+ error("unable to find regmap\n");
+ return -ENODEV;
+ }
+
+ offset = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "offset", 0);
+ mask = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), "mask", 0);
+
+ return regmap_write(regmap, offset, mask);
+}
+
+static struct sysreset_ops syscon_reboot_ops = {
+ .request = syscon_reboot_request,
+};
+
+static const struct udevice_id syscon_reboot_ids[] = {
+ { .compatible = "syscon-reboot" },
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(syscon_reboot) = {
+ .name = "syscon_reboot",
+ .id = UCLASS_SYSRESET,
+ .of_match = syscon_reboot_ids,
+ .ops = &syscon_reboot_ops,
+};
--
2.1.4