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Serge Semin 9192008853 bus: bt1-axi: Use sysfs_streq instead of strncmp
There is a ready-to-use method to compare a retrieved from a sysfs node
string with another string. It treats both NUL and newline-then-NUL as
equivalent string terminations. So use it instead of manually truncating
the line length in the strncmp() method.

Link: https://lore.kernel.org/r/20200528145050.5203-6-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Olof Johansson <olof@lixom.net>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: soc@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2020-05-28 16:57:12 +02:00
Serge Semin 7f57416f2a bus: bt1-axi: Optimize the return points in the driver
It's better to have a single return statement where it's applicable
instead of returning from a conditional statement if-clause. Let's
do this in the request registers, clock and IRQ methods.

Link: https://lore.kernel.org/r/20200528145050.5203-5-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Olof Johansson <olof@lixom.net>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: soc@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2020-05-28 16:57:05 +02:00
Serge Semin 63cb77136e bus: Add Baikal-T1 AXI-bus driver
AXI3-bus is the main communication bus connecting all high-speed
peripheral IP-cores with RAM controller and MIPS P5600 cores on Baikal-T1
SoC. Bus traffic arbitration is done by means of DW AMBA 3 AXI
Interconnect (so called AXI Main Interconnect) routing IO requests from
one SoC block to another. This driver provides a way to detect any bus
protocol errors and device not responding situations by means of an
embedded on top of the interconnect errors handler block (EHB). AXI
Interconnect QoS arbitration tuning is currently unsupported.
The bus doesn't provide a way to detect the interconnected devices,
so they are supposed to be statically defined like by means of the
simple-bus sub-nodes.

[arnd: fix build warnings for missing includes and wrong return types]

Link: https://lore.kernel.org/r/20200526125928.17096-5-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Olof Johansson <olof@lixom.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: soc@kernel.org
Cc: devicetree@vger.kernel.org
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2020-05-28 14:11:53 +02:00