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 --- 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, +};