Hi, These are a few patches for using the EG20T UART on the Imagination Technologies Boston development platform
2 quirks needed - Pass a specific value for the prefetch register from DT instead of using the hard-coded default. - Add a quirk for using the internal 25MHz clock source for the UART block The patches for Boston platform are inflight. https://patchwork.kernel.org/patch/8200941/ So pasting a DT node snippet here. + eg20t_pch@2,0,0 { + compatible = "pci8086,8801"; + reg = <0x00020000 0 0 0 0>; + + intel,eg20t-prefetch = <0>; + }; + eg20t_uart0@02,10,1 { + compatible = "pci8086,8811"; + reg = <0x00025100 0 0 0 0>; + + clock-frequency = <25000000>; + }; Marked as RFC due to the 2/3 patch for DT + PCI-E + board specific quirk Suggestions and feedback welcome. Based on v4.7-rc7 Regards, ZubairLK Zubair Lutfullah Kakakhel (3): misc: pch_phub: Read prefetch value from device tree if passed misc: pch_phub: Add UART_CLK quirk for Boston platform serial: pch_uart: Add support for reading clock-frequency from DT drivers/misc/pch_phub.c | 19 ++++++++++++++++++- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/pch_uart.c | 4 ++++ 3 files changed, 23 insertions(+), 2 deletions(-) -- 1.9.1
