This adds an NVMEM reboot mode driver, similar to Linux's implementation. This allows using the same device tree binding for Linux and U-Boot in most cases.
Signed-off-by: Sean Anderson sean.anderson@seco.com ---
MAINTAINERS | 1 + drivers/reboot-mode/Kconfig | 7 +++ drivers/reboot-mode/Makefile | 1 + drivers/reboot-mode/reboot-mode-nvmem.c | 57 +++++++++++++++++++++++++ 4 files changed, 66 insertions(+) create mode 100644 drivers/reboot-mode/reboot-mode-nvmem.c
diff --git a/MAINTAINERS b/MAINTAINERS index 97b2f69f65..15321ce9bc 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1190,6 +1190,7 @@ M: Sean Anderson seanga2@gmail.com S: Maintained F: doc/api/nvmem.rst F: drivers/misc/nvmem.c +F: drivers/reboot-mode/reboot-mode-nvmem.c F: include/nvmem.h
NXP C45 TJA11XX PHY DRIVER diff --git a/drivers/reboot-mode/Kconfig b/drivers/reboot-mode/Kconfig index 63ea18cdf0..d57baacc93 100644 --- a/drivers/reboot-mode/Kconfig +++ b/drivers/reboot-mode/Kconfig @@ -30,4 +30,11 @@ config DM_REBOOT_MODE_RTC a device in a specific mode by using a register(s) that can be controlled outside U-Boot (e.g. Kernel).
+config REBOOT_MODE_NVMEM + bool "Use NVMEM reboot mode" + depends on DM_REBOOT_MODE && NVMEM + help + Use any kind of non-volatile memory (EEPROM, RTC, etc) to control the + reboot mode. + endmenu diff --git a/drivers/reboot-mode/Makefile b/drivers/reboot-mode/Makefile index 2c13780ced..48c8ab7fe7 100644 --- a/drivers/reboot-mode/Makefile +++ b/drivers/reboot-mode/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_DM_REBOOT_MODE) += reboot-mode-uclass.o obj-$(CONFIG_DM_REBOOT_MODE_GPIO) += reboot-mode-gpio.o obj-$(CONFIG_DM_REBOOT_MODE_RTC) += reboot-mode-rtc.o +obj-$(CONFIG_REBOOT_MODE_NVMEM) += reboot-mode-nvmem.o diff --git a/drivers/reboot-mode/reboot-mode-nvmem.c b/drivers/reboot-mode/reboot-mode-nvmem.c new file mode 100644 index 0000000000..da41ca41d9 --- /dev/null +++ b/drivers/reboot-mode/reboot-mode-nvmem.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2022 Sean Anderson sean.anderson@seco.com + */ + +#include <common.h> +#include <dm.h> +#include <nvmem.h> +#include <reboot-mode/reboot-mode.h> + +/** + * struct nvmem_reboot_mode_priv - Private data for the nvmem reboot mode device + * @cell: The nvmem cell to store the mode in + */ +struct nvmem_reboot_mode_priv { + struct nvmem_cell cell; +}; + +static int reboot_mode_get(struct udevice *dev, u32 *mode) +{ + struct nvmem_reboot_mode_priv *priv = dev_get_priv(dev); + + return nvmem_cell_read(&priv->cell, mode, sizeof(*mode)); +} + +static int reboot_mode_set(struct udevice *dev, u32 mode) +{ + struct nvmem_reboot_mode_priv *priv = dev_get_priv(dev); + + return nvmem_cell_write(&priv->cell, &mode, sizeof(mode)); +} + +static const struct reboot_mode_ops nvmem_reboot_mode_ops = { + .get = reboot_mode_get, + .set = reboot_mode_set, +}; + +static int reboot_mode_probe(struct udevice *dev) +{ + struct nvmem_reboot_mode_priv *priv = dev_get_priv(dev); + + return nvmem_cell_get_by_name(dev, "reboot-mode", &priv->cell); +} + +static const struct udevice_id nvmem_reboot_mode_ids[] = { + { .compatible = "nvmem-reboot-mode" }, + { } +}; + +U_BOOT_DRIVER(nvmem_reboot_mode) = { + .name = "nvmem-reboot-mode", + .id = UCLASS_REBOOT_MODE, + .of_match = nvmem_reboot_mode_ids, + .probe = reboot_mode_probe, + .priv_auto = sizeof(struct nvmem_reboot_mode_priv), + .ops = &nvmem_reboot_mode_ops, +};