| Message ID | 20210112142342.7290-1-nsaenzjulienne@suse.de |
|---|---|
| Headers | show |
| Series | Expose RPi4's bootloader configuration | expand |
On 12/01/2021 14:23, Nicolas Saenz Julienne wrote: > Soon to be released versions of RPi4's firmware will take of care > passing their bootloader's configuration[1] to the OS by copying it into > memory and creating a reserved memory node in the board's DT. By > modeling this reserved memory node as an nvmem device using > 'nvmem-rmem', which this series introduces, user-space applications will > be able to query this information through nvmem's sysfs interface. > > An alternative approach, less nice IMO, would be to create a > platform-specific 'soc' driver. > > Regards, > Nicolas > > [1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md > > --- > > Changes since v2: > - Fix DT bingins > > Changes since v1: > - Avoid the reserved-memory indirection by integrating the nvmem driver > into the reserved memory node. > > Nicolas Saenz Julienne (5): > dt-bindings: nvmem: Add bindings for rmem driver > nvmem: Add driver to expose reserved memory as nvmem > ARM: dts: bcm2711: Add reserved memory template to hold firmware > configuration > arm64: defconfig: Enable nvmem's rmem driver > ARM: multi_v7_defconfig: Enable nvmem's rmem driver > Thanks Applied (1/5) and (2/5), rest of patches should go via arm-soc tree! --srini > .../devicetree/bindings/nvmem/rmem.yaml | 49 ++++++++++ > arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 17 ++++ > arch/arm/configs/multi_v7_defconfig | 1 + > arch/arm64/configs/defconfig | 1 + > drivers/nvmem/Kconfig | 8 ++ > drivers/nvmem/Makefile | 2 + > drivers/nvmem/rmem.c | 97 +++++++++++++++++++ > drivers/of/platform.c | 1 + > 8 files changed, 176 insertions(+) > create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml > create mode 100644 drivers/nvmem/rmem.c >
On Tue, 2021-01-12 at 15:23 +0100, Nicolas Saenz Julienne wrote: > Soon to be released versions of RPi4's firmware will take of care > passing their bootloader's configuration[1] to the OS by copying it into > memory and creating a reserved memory node in the board's DT. By > modeling this reserved memory node as an nvmem device using > 'nvmem-rmem', which this series introduces, user-space applications will > be able to query this information through nvmem's sysfs interface. > > An alternative approach, less nice IMO, would be to create a > platform-specific 'soc' driver. > > Regards, > Nicolas > > [1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md > Applied patches #3 to #5 for next. Regards, Nicolas
Soon to be released versions of RPi4's firmware will take of care passing their bootloader's configuration[1] to the OS by copying it into memory and creating a reserved memory node in the board's DT. By modeling this reserved memory node as an nvmem device using 'nvmem-rmem', which this series introduces, user-space applications will be able to query this information through nvmem's sysfs interface. An alternative approach, less nice IMO, would be to create a platform-specific 'soc' driver. Regards, Nicolas [1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md --- Changes since v2: - Fix DT bingins Changes since v1: - Avoid the reserved-memory indirection by integrating the nvmem driver into the reserved memory node. Nicolas Saenz Julienne (5): dt-bindings: nvmem: Add bindings for rmem driver nvmem: Add driver to expose reserved memory as nvmem ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration arm64: defconfig: Enable nvmem's rmem driver ARM: multi_v7_defconfig: Enable nvmem's rmem driver .../devicetree/bindings/nvmem/rmem.yaml | 49 ++++++++++ arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 17 ++++ arch/arm/configs/multi_v7_defconfig | 1 + arch/arm64/configs/defconfig | 1 + drivers/nvmem/Kconfig | 8 ++ drivers/nvmem/Makefile | 2 + drivers/nvmem/rmem.c | 97 +++++++++++++++++++ drivers/of/platform.c | 1 + 8 files changed, 176 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml create mode 100644 drivers/nvmem/rmem.c