From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
The BCM2835 contains 3 auxiliar devices:
* spi1
* spi2
* uart1
All of those 3 devices are enabled/disabled via a shared register,
which is set by default to be disabled.
Access to this register needs to get serialized.
So fter several iterations of discussions with the following idea:
* syscon - device tree should describe HW not drivers to use -
'compatiblity = "brcm,bcm2835-aux-enable", "syscon";'
is not acceptable
* regulator - it is not necessarily a regulator or a power gate
that is implemented in HW, so it is not valid to use
this framework
The recommendation was made to create a new minimal API in soc
just for access to this shared enable/disable register.
This patch-series implements:
* the bcm2835-auxiliar device enable/disable api in soc.
* the bcm2835-auxiliar spi device driver
The uart1 device driver (ns16550 based) is not implemented so far
but should be using the same API.
Martin Sperl (5):
soc: bcm2835: auxiliar devices enable infrastructure
ARM: bcm2835: add DT for the bcm2835 auxiliar devices
dt/bindings: bcm2835: add binding documentation for bcm2835-aux
spi: bcm2835: new driver implementing auxiliar spi1/spi2 on the
bcm2835 soc
dt/bindings: bcm2835: Add binding documentation for auxiliar spi
devices
.../bindings/soc/bcm/brcm,bcm2835-aux.txt | 27 ++
.../bindings/spi/brcm,bcm2835-aux-spi.txt | 61 +++
arch/arm/boot/dts/bcm2835.dtsi | 37 ++
arch/arm/configs/bcm2835_defconfig | 1 +
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/bcm/Kconfig | 11 +
drivers/soc/bcm/Makefile | 1 +
drivers/soc/bcm/bcm2835-aux.c | 154 ++++++
drivers/spi/Kconfig | 12 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-bcm2835aux.c | 506 ++++++++++++++++++++
include/linux/soc/bcm/bcm2835-aux.h | 23 +
13 files changed, 836 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-aux.txt
create mode 100644 Documentation/devicetree/bindings/spi/brcm,bcm2835-aux-spi.txt
create mode 100644 drivers/soc/bcm/Kconfig
create mode 100644 drivers/soc/bcm/Makefile
create mode 100644 drivers/soc/bcm/bcm2835-aux.c
create mode 100644 drivers/spi/spi-bcm2835aux.c
create mode 100644 include/linux/soc/bcm/bcm2835-aux.h
--
1.7.10.4
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