[PATCH v8 0/3] add support for Bluetooth on MT7622 SoC

[sean.wang@mediatek.com (sean.wang at mediatek.com)]

From: Sean Wang <sean.wang@mediatek.com>

v8 and changes since v7:
 - add updates per these suggestions mentioned in [1][2]
 - remove the hack atomic_inc(&hdev->cmd_cnt) mentioned in [2] because it should
   be better to be considered in the core

[1] http://lists.infradead.org/pipermail/linux-mediatek/2018-August/014516.html
[2] http://lists.infradead.org/pipermail/linux-mediatek/2018-August/014518.html

v7 and changes since v6:
 - drop already applied patches
 - move clk_* and pm_* operation to ->open and ->close 
 - label this driver as BT_MTKUART
 - make code style aligned with the other drivers and code better to read
   as these suggestions and fixes are mentioned in [1]

[1] http://lists.infradead.org/pipermail/linux-mediatek/2018-July/014458.html

v6 and changes since v5:
 - make btmtkuart become a separate driver.
 - drop already applied patches and the patch for btuart driver
 - refine comments in driver allowing people know that mtk extra header
   + length doesn't indicate a full H:4 frame, things can fragment.
 - enhance dt-binding document with removing mistaken added " and improve
   English sentence.
 - remove unnecessary '\n' with bt_dev_err.
 - refine code style.
 - set hdev->manufacturer as mtk id.

v5 and changes since v4:
 - add Reviewed-by Tag from Ulf Hansson for patch 2
 - remove default y in Kconfig for btmtkuart selection to avoid overkill for
   users which would like to have less an amount on stuff in kernel.
 - list header declarations in alphabetical order and add a proper blank line
   within.
 - remove unused macro.
 - use sizeof to calculate structure size instead of an aextra macro to hardcode.
 - use struct hci_dev * as input paraments for mtk_hci_wmt_sync and mtk_setup_fw
   for that can be reused in mtk bluetooth with other interfaces.
 - remove unused local variabled in mtk_btuart_recv.
 - remove superfluous :8 for dlen2 in struct mtk_stp_hdr definition.
 - give a reasonable naming for these labels and add a pm_runtime_put_noidle()
   in the path undoing failing pm_runtime_get_sync().
 - Turn __u8 into u8 in struct mtk_stp_hdr.

 Really thanks for these reviews by Johan Hovold and Andy Shevchenko

v4 and changes since v3:
 - refine patch 2 based on commit 919b7308fcc4 to allow that
   dev_pm_domain_attach() will return better error codes. 

v3 and changes since v2
* all changes happen on patch 6
 - fix up SPDX license style for btmtkuart.h.
 - change firmware download from in ACL data to in HCI commands
   and then remove unused mtk_acl_wmt_sync and related code.
 - add a workaround replacing bad vendor event id 0xe4 with 0xff every
   vendor should use.
 - add a sanity check for mtk_hci_wmt_sync to verifying if
   input parameters are valid.
 - add an atomic_inc(&bdev->hdev->cmd_cnt) for __hci_cmd_sync_ev.
 - be changed to use firmware with a header called mt7622pr2h.bin.

v2 and changes since v1
 - Dropped patches already being applied
 - Rewirte the whole driver using btuart [1], and add slight extension
   of btuart to fit into btmtkuart driver. Beware that [1] is also pulled
   into one part of the series for avoiding any breakage when the patchset
   is being compiled.

[1] btuart 
	https://www.spinics.net/lists/linux-bluetooth/msg74918.html

v1:

Hi,

This patchset introduces built-in Bluetooth support on MT7622 SoC.
And, it should be simple to make an extension to support other
MediaTek SoCs with adjusting a few of changes on the initialization
sequence of the device.

Before the main driver is being introduced, a few of things about
power-domain management should be re-worked for serdev core and MediaTek
SCPSYS to allow the Bluetooth to properly power up.

Patch 2: add a generic way attaching power domain to serdev
Patch 3 and 4: add cleanups with reuse APIs from Linux core
Patch 5: fix a limitation about power enablement Bluetooth depends on
Patch 1, 6 and 7: the major part of adding Bluetooth support to MT7622
	
	Sean

Sean Wang (3):
  dt-bindings: net: bluetooth: Add mediatek-bluetooth
  Bluetooth: mediatek: Add protocol support for MediaTek serial devices
  MAINTAINERS: add an entry for MediaTek Bluetooth driver

 .../devicetree/bindings/net/mediatek-bluetooth.txt |  35 ++
 MAINTAINERS                                        |   8 +
 drivers/bluetooth/Kconfig                          |  11 +
 drivers/bluetooth/Makefile                         |   2 +
 drivers/bluetooth/btmtkuart.c                      | 588 +++++++++++++++++++++
 5 files changed, 644 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/mediatek-bluetooth.txt
 create mode 100644 drivers/bluetooth/btmtkuart.c

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2.7.4