Hi Martin, > Realtek RTL8723BS and RTL8723DS are SDIO wifi chips with an embedded > Bluetooth controller which connects to the host via UART. > The H5 protocol is used for communication between host and device. > > The Realtek "rtl8723bs_bt" and "rtl8723ds_bt" userspace Bluetooth UART > initialization tools (rtk_hciattach) use the following sequence: > 1) send H5 sync pattern (already supported by hci_h5) > 2) get LMP version (already supported by btrtl) > 3) get ROM version (already supported by btrtl) > 4) load the firmware and config for the current chipset (already > supported by btrtl) > 5) read UART settings from the config blob (already supported by btrtl) > 6) send UART settings via a vendor command to the device (which changes > the baudrate of the device and enables or disables flow control > depending on the config) > 7) change the baudrate and flow control settings on the host > 8) send the firmware and config blob to the device (already supported by > btrtl) > > This uses the serdev library as well as the existing btrtl driver to > initialize the Bluetooth functionality, which consists of: > - identifying the device and loading the corresponding firmware and > config blobs (steps #2, #3 and #4) > - configuring the baudrate and flow control (steps #6 and #7) > - uploading the firmware to the device (step #8) > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> > --- > drivers/bluetooth/Kconfig | 1 + > drivers/bluetooth/hci_h5.c | 195 ++++++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 195 insertions(+), 1 deletion(-) > > diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig > index 60e1c7d6986d..3001f1200c72 100644 > --- a/drivers/bluetooth/Kconfig > +++ b/drivers/bluetooth/Kconfig > @@ -146,6 +146,7 @@ config BT_HCIUART_LL > config BT_HCIUART_3WIRE > bool "Three-wire UART (H5) protocol support" > depends on BT_HCIUART > + select BT_RTL if SERIAL_DEV_BUS > help > The HCI Three-wire UART Transport Layer makes it possible to > user the Bluetooth HCI over a serial port interface. The HCI so I just posted a bt3wire.c driver that is serdev only and written from scratch. On a RPi3 Broadcom chip it kinda works. I think there is a lot of extra work to be done, but this might be a better starting point for Realtek UART devices. Regards Marcel -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
