[PATCH v6 0/4] Bluetooth: hci_bcm: Additional changes for BCM4354 support

[Abhishek Pandit-Subedi <abhishekpandit@chromium.org>]

While adding support for the BCM4354, I discovered a few more things
that weren't working as they should have.

First, we disallow serdev from setting the baudrate on BCM4354. Serdev
sets the oper_speed first before calling hu->setup() in
hci_uart_setup(). On the BCM4354, this results in bcm_setup() failing
when the hci reset times out.

Next, we add support for setting the PCM parameters, which consists of
a pair of vendor specific opcodes to set the pcm parameters. The
documentation for these params are available in the brcm_patchram_plus
package (i.e. https://github.com/balena-os/brcm_patchram_plus). This is
necessary for PCM to work properly.

All changes were tested with rk3288-veyron-minnie.dts.


Changes in v6:
- Added btbcm_read_pcm_int_params and change pcm params to first read
  the pcm params before setting it

Changes in v5:
- Rename parameters to bt-* and read as integer instead of bytestring
- Update documentation with defaults and put values in header
- Changed patch order

Changes in v4:
- Fix incorrect function name in hci_bcm

Changes in v3:
- Change disallow baudrate setting to return -EBUSY if called before
  ready. bcm_proto is no longer modified and is back to being const.
- Changed btbcm_set_pcm_params to btbcm_set_pcm_int_params
- Changed brcm,sco-routing to brcm,bt-sco-routing

Changes in v2:
- Use match data to disallow baudrate setting
- Parse pcm parameters by name instead of as a byte string
- Fix prefix for dt-bindings commit

Abhishek Pandit-Subedi (4):
  Bluetooth: hci_bcm: Disallow set_baudrate for BCM4354
  Bluetooth: btbcm: Support pcm configuration
  dt-bindings: net: broadcom-bluetooth: Add pcm config
  Bluetooth: hci_bcm: Support pcm params in dts

 .../bindings/net/broadcom-bluetooth.txt       | 16 ++++
 drivers/bluetooth/btbcm.c                     | 47 ++++++++++
 drivers/bluetooth/btbcm.h                     | 16 ++++
 drivers/bluetooth/hci_bcm.c                   | 88 ++++++++++++++++++-
 include/dt-bindings/bluetooth/brcm.h          | 32 +++++++
 5 files changed, 197 insertions(+), 2 deletions(-)
 create mode 100644 include/dt-bindings/bluetooth/brcm.h

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2.24.0.432.g9d3f5f5b63-goog