From: kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org
To: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
Lee Jones <lee-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
Subject: [PATCH v5 0/6] bcm2835: auxiliar device support for spi
Date: Fri, 4 Sep 2015 09:41:44 +0000 [thread overview]
Message-ID: <1441359711-2800-1-git-send-email-kernel@martin.sperl.org> (raw)
From: Martin Sperl <kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
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 after several iterations of discussions with the following ideas:
* 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 would be using the same API.
Both spi and uart drivers can run with shared interrupts,
so there is no need for an interrupt-controller to get implemented.
Martin Sperl (6):
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
ARM: bcm2835: enable building of spi-bcm2835aux driver in default
config
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 | 47 ++
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 | 514 ++++++++++++++++++++
include/linux/soc/bcm/bcm2835-aux.h | 23 +
13 files changed, 830 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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next reply other threads:[~2015-09-04 9:41 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-04 9:41 kernel-TqfNSX0MhmxHKSADF0wUEw [this message]
2015-09-04 9:41 ` [PATCH 1/6] soc: bcm2835: auxiliar devices enable infrastructure kernel
2015-09-04 9:41 ` [PATCH v5 2/6] ARM: bcm2835: add DT for the bcm2835 auxiliar devices kernel
2015-09-04 9:41 ` [PATCH v5 3/6] dt/bindings: bcm2835: add binding documentation for bcm2835-aux kernel
2015-09-04 9:41 ` [PATCH v5 4/6] spi: bcm2835: new driver implementing auxiliar spi1/spi2 on the bcm2835 soc kernel
2015-09-09 2:20 ` Eric Anholt
2015-09-04 9:41 ` [PATCH v5 5/6] ARM: bcm2835: enable building of spi-bcm2835aux driver in default config kernel
[not found] ` <1441359711-2800-1-git-send-email-kernel-TqfNSX0MhmxHKSADF0wUEw@public.gmane.org>
2015-09-04 9:41 ` [PATCH v5 6/6] dt/bindings: bcm2835: Add binding documentation for auxiliar spi devices kernel-TqfNSX0MhmxHKSADF0wUEw
2015-09-09 1:48 ` [PATCH v5 0/6] bcm2835: auxiliar device support for spi Eric Anholt
[not found] ` <87h9n4weg8.fsf-omZaPlIz5HhaEpDpdNBo/KxOck334EZe@public.gmane.org>
2015-09-09 9:00 ` Alexander Stein
2015-09-09 18:27 ` Eric Anholt
2015-09-10 15:48 ` Noralf Trønnes
[not found] ` <55F1A651.5090102-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
2015-09-10 15:57 ` Martin Sperl
2015-09-10 16:58 ` Phil Elwell
2015-09-10 17:02 ` Phil Elwell
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