[PATCH v4 0/2] Add new physical regmap bus support

[Baolin Wang <baolin.wang7@gmail.com>]

The Spreadtrum platform uses a special set/clear method to update
registers' bits, thus this patch set exports a weak function to
allow to register a physical regmap bus to support this feature
instead of using the MMIO bus, which is not a physical regmap bus.

Any comments are welcome. Thanks.

Changes from v3:
 - Remove vendor specific support from the syscon driver, and export
 a weak function to support physical regmap bus.

Changes from v2:
 - Fix building errors without enabling CONFIG_ARCH_SPRD.

Changes from v1:
 - Add WARN_ONCE() for seting bits and clearing bits at the same time.
 - Remove the Spreadtrum SoC syscon driver, instead moving the regmap_bus
 instance into syscon.c driver.

Changes from RFC v2:
 - Drop regmap change, which was applied by Mark.
 - Add more information about how to use set/clear.
 - Add checking to ensure the platform is compatible with
 using a new physical regmap bus.

Changes from RFC v1:
 - Add new helper to registers a physical regmap bus instead of
 using the MMIO bus.

Baolin Wang (2):
  mfd: syscon: Support physical regmap bus
  soc: sprd: Add Spreadtrum special bits updating support

 drivers/mfd/syscon.c           |  9 +++-
 drivers/soc/Kconfig            |  1 +
 drivers/soc/Makefile           |  1 +
 drivers/soc/sprd/Kconfig       | 16 +++++++
 drivers/soc/sprd/Makefile      |  2 +
 drivers/soc/sprd/sprd_syscon.c | 86 ++++++++++++++++++++++++++++++++++
 include/linux/mfd/syscon.h     | 11 +++++
 7 files changed, 125 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/sprd/Kconfig
 create mode 100644 drivers/soc/sprd/Makefile
 create mode 100644 drivers/soc/sprd/sprd_syscon.c

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2.17.1