Add a random number generator(rng) uclass to facilitate adding drivers for rng devices. I plan to add an implementation of the EFI_RNG_PROTOCOL, which would get the random number from the rng uclass -- the protocol would be used by the efi stub for getting a random number for the kaslr feature.
The patch series also adds a driver for the rng device found on the stm32mp1 and qemu platforms. A dummy rng driver for sandbox has also been added, along with the unit test for the rng uclass. Changes since V7: * Set the length to min(len, sizeof(buf)) to avoid a buffer overrun. Changes since V6: * Handle review comments from Heinrich Schuchardt to handle the scenario of data buffer being passed to the virtio rng driver not being aligned on 4 bytes. * Handle review comment by Simon Glass to only keep a forward declaration of struct udevice in rng.h. Changes since V5: * Handle review comments from Heinrich Schuchardt to read all the bytes requested in the individual drivers. Changes since V4: * Get the read functions of individual drivers to return number of bytes read on successful read, and a -ve value on error. * Handle review comments from Heinrich Schuchardt. Changes since V3: * Handle review comments from Patrick Delaunay Changes since V2: * Add a driver for the virtio-rng device on qemu platform Changes since V1: * Add a SPDX header in rng.h * Change the UCLASS_DRIVER name from hwrng to rng, consistent with the rest of the naming convention * Handle review comment from Patrice Chotard Sughosh Ganu (8): dm: rng: Add random number generator(rng) uclass clk: stm32mp1: Add a clock entry for RNG1 device stm32mp1: rng: Add a driver for random number generator(rng) device configs: stm32mp15: Enable random number generator(rng) device sandbox: rng: Add a random number generator(rng) driver configs: sandbox: Enable random number generator(rng) device test: rng: Add basic test for random number generator(rng) uclass virtio: rng: Add a random number generator(rng) driver arch/sandbox/dts/test.dts | 4 + configs/sandbox64_defconfig | 2 + configs/sandbox_defconfig | 2 + configs/stm32mp15_basic_defconfig | 2 + configs/stm32mp15_optee_defconfig | 2 + configs/stm32mp15_trusted_defconfig | 2 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/clk/clk_stm32mp1.c | 1 + drivers/rng/Kconfig | 22 +++++ drivers/rng/Makefile | 8 ++ drivers/rng/rng-uclass.c | 23 ++++++ drivers/rng/sandbox_rng.c | 56 +++++++++++++ drivers/rng/stm32mp1_rng.c | 161 ++++++++++++++++++++++++++++++++++++ drivers/virtio/Kconfig | 6 ++ drivers/virtio/Makefile | 1 + drivers/virtio/virtio-uclass.c | 1 + drivers/virtio/virtio_rng.c | 88 ++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/rng.h | 33 ++++++++ include/virtio.h | 4 +- test/dm/Makefile | 1 + test/dm/rng.c | 26 ++++++ 23 files changed, 448 insertions(+), 1 deletion(-) create mode 100644 drivers/rng/Kconfig create mode 100644 drivers/rng/Makefile create mode 100644 drivers/rng/rng-uclass.c create mode 100644 drivers/rng/sandbox_rng.c create mode 100644 drivers/rng/stm32mp1_rng.c create mode 100644 drivers/virtio/virtio_rng.c create mode 100644 include/rng.h create mode 100644 test/dm/rng.c -- 2.7.4
