The Raspberry Pi (bcm283x SoC) family contains 2 IP blocks to drive SD peripherals: A pretty standard SDHCI one called iProc and a home grown one called "sdhost".
When driving U-Boot by the same device tree that we use for Linux, we end up in situations where only the "sdhost" device is available for use. In those situations, current U-Boot can simply not drive the SD card, because the device tree disables the SDHCI device.
This patch set also adds a full pinctrl driver for pinmuxing the SD devices properly to their respective pins. This is necessary because the RPi firmware doesn't mux the SD pins according to the device tree but instead expects the payload (usually Linux, U-Boot for us) to do that.
With this patch set, I can successfully use U-Boot on a RPi3 Compute Module with CONFIG_OF_BOARD=y and a device tree generated by the RPi firmware (plus a few overlays in config.txt for vc4, serial, etc).
v1 -> v2:
- Introduce real pinctrl driver - Checkpatch fixes - Remove hand written pinctrl support
Alexander Graf (2): bcm283x: Add pinctrl driver mmc: Add bcm2835 sdhost controller
MAINTAINERS | 2 + arch/arm/mach-bcm283x/include/mach/gpio.h | 2 - board/raspberrypi/rpi/rpi.c | 5 +- configs/rpi_0_w_defconfig | 4 + configs/rpi_2_defconfig | 4 + configs/rpi_3_32b_defconfig | 4 + configs/rpi_3_defconfig | 4 + configs/rpi_defconfig | 4 + drivers/gpio/bcm2835_gpio.c | 29 +- drivers/mmc/Kconfig | 14 + drivers/mmc/Makefile | 1 + drivers/mmc/bcm2835_sdhost.c | 994 +++++++++++++++++++++++++++++ drivers/pinctrl/Kconfig | 1 + drivers/pinctrl/Makefile | 1 + drivers/pinctrl/broadcom/Kconfig | 7 + drivers/pinctrl/broadcom/Makefile | 7 + drivers/pinctrl/broadcom/pinctrl-bcm283x.c | 150 +++++ 17 files changed, 1210 insertions(+), 23 deletions(-) create mode 100644 drivers/mmc/bcm2835_sdhost.c create mode 100644 drivers/pinctrl/broadcom/Kconfig create mode 100644 drivers/pinctrl/broadcom/Makefile create mode 100644 drivers/pinctrl/broadcom/pinctrl-bcm283x.c