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[v2,0/2] Rpi: Add support for second sd host controller

Message ID 20180117233317.37302-1-agraf@suse.de
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Series Rpi: Add support for second sd host controller | expand

Message

Alexander Graf Jan. 17, 2018, 11:33 p.m. UTC 
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