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linux/drivers/nvmem/Kconfig
Miquel Raynal fc29fd821d nvmem: core: Rework layouts to become regular devices 
Current layout support was initially written without modules support in
mind. When the requirement for module support rose, the existing base
was improved to adopt modularization support, but kind of a design flaw
was introduced. With the existing implementation, when a storage device
registers into NVMEM, the core tries to hook a layout (if any) and
populates its cells immediately. This means, if the hardware description
expects a layout to be hooked up, but no driver was provided for that,
the storage medium will fail to probe and try later from
scratch. Even if we consider that the hardware description shall be
correct, we could still probe the storage device (especially if it
contains the rootfs).

One way to overcome this situation is to consider the layouts as
devices, and leverage the native notifier mechanism. When a new NVMEM
device is registered, we can populate its nvmem-layout child, if any,
and wait for the matching to be done in order to get the cells (the
waiting can be easily done with the NVMEM notifiers). If the layout
driver is compiled as a module, it should automatically be loaded. This
way, there is no strong order to enforce, any NVMEM device creation
or NVMEM layout driver insertion will be observed as a new event which
may lead to the creation of additional cells, without disturbing the
probes with costly (and sometimes endless) deferrals.

In order to achieve that goal we create a new bus for the nvmem-layouts
with minimal logic to match nvmem-layout devices with nvmem-layout
drivers. All this infrastructure code is created in the layouts.c file.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20231215111536.316972-7-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-15 13:30:07 +01:00

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# SPDX-License-Identifier: GPL-2.0-only
menuconfig NVMEM
bool "NVMEM Support"
imply NVMEM_LAYOUTS
help
Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES...
This framework is designed to provide a generic interface to NVMEM
from both the Linux Kernel and the userspace.
If unsure, say no.
if NVMEM
config NVMEM_SYSFS
bool "/sys/bus/nvmem/devices/*/nvmem (sysfs interface)"
depends on SYSFS
default y
help
Say Y here to add a sysfs interface for NVMEM.
This interface is mostly used by userspace applications to
read/write directly into nvmem.
# Layouts
source "drivers/nvmem/layouts/Kconfig"
# Devices
config NVMEM_APPLE_EFUSES
tristate "Apple eFuse support"
depends on ARCH_APPLE || COMPILE_TEST
default ARCH_APPLE
help
Say y here to enable support for reading eFuses on Apple SoCs
such as the M1. These are e.g. used to store factory programmed
calibration data required for the PCIe or the USB-C PHY.
This driver can also be built as a module. If so, the module will
be called nvmem-apple-efuses.
config NVMEM_BCM_OCOTP
tristate "Broadcom On-Chip OTP Controller support"
depends on ARCH_BCM_IPROC || COMPILE_TEST
depends on HAS_IOMEM
default ARCH_BCM_IPROC
help
Say y here to enable read/write access to the Broadcom OTP
controller.
This driver can also be built as a module. If so, the module
will be called nvmem-bcm-ocotp.
config NVMEM_BRCM_NVRAM
tristate "Broadcom's NVRAM support"
depends on ARCH_BCM_5301X || COMPILE_TEST
depends on HAS_IOMEM
select GENERIC_NET_UTILS
help
This driver provides support for Broadcom's NVRAM that can be accessed
using I/O mapping.
config NVMEM_IMX_IIM
tristate "i.MX IC Identification Module support"
depends on ARCH_MXC || COMPILE_TEST
help
This is a driver for the IC Identification Module (IIM) available on
i.MX SoCs, providing access to 4 Kbits of programmable
eFuses.
This driver can also be built as a module. If so, the module
will be called nvmem-imx-iim.
config NVMEM_IMX_OCOTP
tristate "i.MX 6/7/8 On-Chip OTP Controller support"
depends on ARCH_MXC || COMPILE_TEST
depends on HAS_IOMEM
help
This is a driver for the On-Chip OTP Controller (OCOTP) available on
i.MX6 SoCs, providing access to 4 Kbits of one-time programmable
eFuses.
This driver can also be built as a module. If so, the module
will be called nvmem-imx-ocotp.
config NVMEM_IMX_OCOTP_ELE
tristate "i.MX On-Chip OTP Controller support"
depends on ARCH_MXC || COMPILE_TEST
depends on HAS_IOMEM
depends on OF
help
This is a driver for the On-Chip OTP Controller (OCOTP)
available on i.MX SoCs which has ELE.
config NVMEM_IMX_OCOTP_SCU
tristate "i.MX8 SCU On-Chip OTP Controller support"
depends on IMX_SCU
depends on HAVE_ARM_SMCCC
help
This is a driver for the SCU On-Chip OTP Controller (OCOTP)
available on i.MX8 SoCs.
config NVMEM_JZ4780_EFUSE
tristate "JZ4780 EFUSE Memory Support"
depends on MACH_INGENIC || COMPILE_TEST
depends on HAS_IOMEM
depends on OF
select REGMAP_MMIO
help
Say Y here to include support for JZ4780 efuse memory found on
all JZ4780 SoC based devices.
To compile this driver as a module, choose M here: the module
will be called nvmem_jz4780_efuse.
config NVMEM_LAN9662_OTPC
tristate "Microchip LAN9662 OTP controller support"
depends on SOC_LAN966 || COMPILE_TEST
depends on HAS_IOMEM
help
This driver enables the OTP controller available on Microchip LAN9662
SoCs. It controls the access to the OTP memory connected to it.
config NVMEM_LAYERSCAPE_SFP
tristate "Layerscape SFP (Security Fuse Processor) support"
depends on ARCH_LAYERSCAPE || COMPILE_TEST
depends on HAS_IOMEM
select REGMAP_MMIO
help
This driver provides support to read the eFuses on Freescale
Layerscape SoC's. For example, the vendor provides a per part
unique ID there.
This driver can also be built as a module. If so, the module
will be called layerscape-sfp.
config NVMEM_LPC18XX_EEPROM
tristate "NXP LPC18XX EEPROM Memory Support"
depends on ARCH_LPC18XX || COMPILE_TEST
depends on HAS_IOMEM
help
Say Y here to include support for NXP LPC18xx EEPROM memory found in
NXP LPC185x/3x and LPC435x/3x/2x/1x devices.
To compile this driver as a module, choose M here: the module
will be called nvmem_lpc18xx_eeprom.
config NVMEM_LPC18XX_OTP
tristate "NXP LPC18XX OTP Memory Support"
depends on ARCH_LPC18XX || COMPILE_TEST
depends on HAS_IOMEM
help
Say Y here to include support for NXP LPC18xx OTP memory found on
all LPC18xx and LPC43xx devices.
To compile this driver as a module, choose M here: the module
will be called nvmem_lpc18xx_otp.
config NVMEM_MESON_EFUSE
tristate "Amlogic Meson GX eFuse Support"
depends on (ARCH_MESON || COMPILE_TEST) && MESON_SM
help
This is a driver to retrieve specific values from the eFuse found on
the Amlogic Meson GX SoCs.
This driver can also be built as a module. If so, the module
will be called nvmem_meson_efuse.
config NVMEM_MESON_MX_EFUSE
tristate "Amlogic Meson6/Meson8/Meson8b eFuse Support"
depends on ARCH_MESON || COMPILE_TEST
help
This is a driver to retrieve specific values from the eFuse found on
the Amlogic Meson6, Meson8 and Meson8b SoCs.
This driver can also be built as a module. If so, the module
will be called nvmem_meson_mx_efuse.
config NVMEM_MICROCHIP_OTPC
tristate "Microchip OTPC support"
depends on ARCH_AT91 || COMPILE_TEST
help
This driver enable the OTP controller available on Microchip SAMA7G5
SoCs. It controls the access to the OTP memory connected to it.
config NVMEM_MTK_EFUSE
tristate "Mediatek SoCs EFUSE support"
depends on ARCH_MEDIATEK || COMPILE_TEST
depends on HAS_IOMEM
help
This is a driver to access hardware related data like sensor
calibration, HDMI impedance etc.
This driver can also be built as a module. If so, the module
will be called efuse-mtk.
config NVMEM_MXS_OCOTP
tristate "Freescale MXS On-Chip OTP Memory Support"
depends on ARCH_MXS || COMPILE_TEST
depends on HAS_IOMEM
help
If you say Y here, you will get readonly access to the
One Time Programmable memory pages that are stored
on the Freescale i.MX23/i.MX28 processor.
This driver can also be built as a module. If so, the module
will be called nvmem-mxs-ocotp.
config NVMEM_NINTENDO_OTP
tristate "Nintendo Wii and Wii U OTP Support"
depends on WII || COMPILE_TEST
help
This is a driver exposing the OTP of a Nintendo Wii or Wii U console.
This memory contains common and per-console keys, signatures and
related data required to access peripherals.
This driver can also be built as a module. If so, the module
will be called nvmem-nintendo-otp.
config NVMEM_QCOM_QFPROM
tristate "QCOM QFPROM Support"
depends on ARCH_QCOM || COMPILE_TEST
depends on HAS_IOMEM
help
Say y here to enable QFPROM support. The QFPROM provides access
functions for QFPROM data to rest of the drivers via nvmem interface.
This driver can also be built as a module. If so, the module
will be called nvmem_qfprom.
config NVMEM_QCOM_SEC_QFPROM
tristate "QCOM SECURE QFPROM Support"
depends on ARCH_QCOM || COMPILE_TEST
depends on HAS_IOMEM
depends on OF
select QCOM_SCM
help
Say y here to enable secure QFPROM support. The secure QFPROM provides access
functions for QFPROM data to rest of the drivers via nvmem interface.
This driver can also be built as a module. If so, the module will be called
nvmem_sec_qfprom.
config NVMEM_RAVE_SP_EEPROM
tristate "Rave SP EEPROM Support"
depends on RAVE_SP_CORE
help
Say y here to enable Rave SP EEPROM support.
config NVMEM_RMEM
tristate "Reserved Memory Based Driver Support"
depends on HAS_IOMEM
help
This driver maps reserved memory into an nvmem device. It might be
useful to expose information left by firmware in memory.
This driver can also be built as a module. If so, the module
will be called nvmem-rmem.
config NVMEM_ROCKCHIP_EFUSE
tristate "Rockchip eFuse Support"
depends on ARCH_ROCKCHIP || COMPILE_TEST
depends on HAS_IOMEM
help
This is a simple driver to dump specified values of Rockchip SoC
from eFuse, such as cpu-leakage.
This driver can also be built as a module. If so, the module
will be called nvmem_rockchip_efuse.
config NVMEM_ROCKCHIP_OTP
tristate "Rockchip OTP controller support"
depends on ARCH_ROCKCHIP || COMPILE_TEST
depends on HAS_IOMEM
help
This is a simple driver to dump specified values of Rockchip SoC
from OTP, such as cpu-leakage.
This driver can also be built as a module. If so, the module
will be called nvmem_rockchip_otp.
config NVMEM_SC27XX_EFUSE
tristate "Spreadtrum SC27XX eFuse Support"
depends on MFD_SC27XX_PMIC || COMPILE_TEST
depends on HAS_IOMEM
help
This is a simple driver to dump specified values of Spreadtrum
SC27XX PMICs from eFuse.
This driver can also be built as a module. If so, the module
will be called nvmem-sc27xx-efuse.
config NVMEM_SNVS_LPGPR
tristate "Support for Low Power General Purpose Register"
depends on ARCH_MXC || COMPILE_TEST
help
This is a driver for Low Power General Purpose Register (LPGPR) available on
i.MX6 and i.MX7 SoCs in Secure Non-Volatile Storage (SNVS) of this chip.
This driver can also be built as a module. If so, the module
will be called nvmem-snvs-lpgpr.
config NVMEM_SPMI_SDAM
tristate "SPMI SDAM Support"
depends on SPMI
help
This driver supports the Shared Direct Access Memory Module on
Qualcomm Technologies, Inc. PMICs. It provides the clients
an interface to read/write to the SDAM module's shared memory.
config NVMEM_SPRD_EFUSE
tristate "Spreadtrum SoC eFuse Support"
depends on ARCH_SPRD || COMPILE_TEST
depends on HAS_IOMEM
help
This is a simple driver to dump specified values of Spreadtrum
SoCs from eFuse.
This driver can also be built as a module. If so, the module
will be called nvmem-sprd-efuse.
config NVMEM_STM32_BSEC_OPTEE_TA
def_bool NVMEM_STM32_ROMEM && OPTEE
help
Say y here to enable the accesses to STM32MP SoC OTPs by the OP-TEE
trusted application STM32MP BSEC.
This library is a used by stm32-romem driver or included in the module
called nvmem-stm32-romem.
config NVMEM_STM32_ROMEM
tristate "STMicroelectronics STM32 factory-programmed memory support"
depends on ARCH_STM32 || COMPILE_TEST
depends on OPTEE || !OPTEE
help
Say y here to enable read-only access for STMicroelectronics STM32
factory-programmed memory area.
This driver can also be built as a module. If so, the module
will be called nvmem-stm32-romem.
config NVMEM_SUNPLUS_OCOTP
tristate "Sunplus SoC OTP support"
depends on SOC_SP7021 || COMPILE_TEST
depends on HAS_IOMEM
help
This is a driver for the On-chip OTP controller (OCOTP) available
on Sunplus SoCs. It provides access to 128 bytes of one-time
programmable eFuse.
This driver can also be built as a module. If so, the module
will be called nvmem-sunplus-ocotp.
config NVMEM_SUNXI_SID
tristate "Allwinner SoCs SID support"
depends on ARCH_SUNXI
help
This is a driver for the 'security ID' available on various Allwinner
devices.
This driver can also be built as a module. If so, the module
will be called nvmem_sunxi_sid.
config NVMEM_U_BOOT_ENV
tristate "U-Boot environment variables support"
depends on OF && MTD
select CRC32
select GENERIC_NET_UTILS
help
U-Boot stores its setup as environment variables. This driver adds
support for verifying & exporting such data. It also exposes variables
as NVMEM cells so they can be referenced by other drivers.
Currently this drivers works only with env variables on top of MTD.
If compiled as module it will be called nvmem_u-boot-env.
config NVMEM_UNIPHIER_EFUSE
tristate "UniPhier SoCs eFuse support"
depends on ARCH_UNIPHIER || COMPILE_TEST
depends on HAS_IOMEM
help
This is a simple driver to dump specified values of UniPhier SoC
from eFuse.
This driver can also be built as a module. If so, the module
will be called nvmem-uniphier-efuse.
config NVMEM_VF610_OCOTP
tristate "VF610 SoC OCOTP support"
depends on SOC_VF610 || COMPILE_TEST
depends on HAS_IOMEM
help
This is a driver for the 'OCOTP' peripheral available on Vybrid
devices like VF5xx and VF6xx.
This driver can also be build as a module. If so, the module will
be called nvmem-vf610-ocotp.
config NVMEM_ZYNQMP
tristate "Xilinx ZYNQMP SoC nvmem firmware support"
depends on ARCH_ZYNQMP
help
This is a driver to access hardware related data like
soc revision, IDCODE... etc by using the firmware
interface.
If sure, say yes. If unsure, say no.
config NVMEM_QORIQ_EFUSE
tristate "NXP QorIQ eFuse support"
depends on PPC_85xx || COMPILE_TEST
depends on HAS_IOMEM
help
This driver provides read support for the eFuses (SFP) on NXP QorIQ
series SoC's. This includes secure boot settings, the globally unique
NXP ID 'FUIDR' and the OEM unique ID 'OUIDR'.
This driver can also be built as a module. If so, the module
will be called nvmem_qoriq_efuse.
endif
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