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authorGeert Uytterhoeven <geert+renesas@glider.be>2024-10-30 14:03:10 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2024-11-05 05:33:46 +0100
commit1530b923a514b158b91453bf5adc9291e77638f5 (patch)
treec193a5afc798c7c9dae110ef126773dd1744250f /drivers/nvmem/Kconfig
parent2aea0d17ff9e08e8ab50dd588c53cc37d963e016 (diff)
nvmem: Add R-Car E-FUSE driver
R-Car Gen4 SoCs contain fuses indicating hardware support or hardware (e.g. tuning) parameters. Add a driver to access the state of the fuses. This supports two types of hardware fuse providers: 1. E-FUSE non-volatile memory accessible through the Pin Function Controller on R-Car V3U and S4-8, 2. E-FUSE non-volatile memory accessible through OTP_MEM on R-Car V4H and V4M. The state of the cells can be read using the NVMEM framework, either from kernel space (e.g. by the Renesas UFSHCD driver), or from userspace. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241030140315.40562-3-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem/Kconfig')
-rw-r--r--drivers/nvmem/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index d2c384f58028..8671b7c974b9 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -246,6 +246,17 @@ config NVMEM_RAVE_SP_EEPROM
help
Say y here to enable Rave SP EEPROM support.
+config NVMEM_RCAR_EFUSE
+ tristate "Renesas R-Car Gen4 E-FUSE support"
+ depends on (ARCH_RENESAS && ARM64) || COMPILE_TEST
+ depends on NVMEM
+ help
+ Enable support for reading the fuses in the E-FUSE or OTP
+ non-volatile memory block on Renesas R-Car Gen4 SoCs.
+
+ This driver can also be built as a module. If so, the module
+ will be called nvmem-rcar-efuse.
+
config NVMEM_RMEM
tristate "Reserved Memory Based Driver Support"
depends on HAS_IOMEM