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u-boot-brain/drivers/serial
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Alexander Graf 601147b06a serial: bcm283x_mu: Detect disabled serial device 
On the raspberry pi, you can disable the serial port to gain dynamic frequency
scaling which can get handy at times.

However, in such a configuration the serial controller gets its rx queue filled
up with zero bytes which then happily get transmitted on to whoever calls
getc() today.

This patch adds detection logic for that case by checking whether the RX pin is
mapped to GPIO15 and disables the mini uart if it is not mapped properly.

That way we can leave the driver enabled in the tree and can determine during
runtime whether serial is usable or not, having a single binary that allows for
uart and non-uart operation.

Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-06 13:18:19 -04:00
..
altera_jtag_uart.c altera_jtag_uart: change ioremap to map_physmem 2015-11-18 21:18:30 +08:00
altera_uart.c altera_uart: change ioremap to map_physmem 2015-11-18 21:18:30 +08:00
arm_dcc.c serial: dcc: Move driver to DM 2016-02-25 19:06:37 -05:00
atmel_usart.c serial: atmel_usart: Add device tree support 2016-06-12 23:49:38 +02:00
atmel_usart.h Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
Kconfig ARM: uniphier: change UNIPHIER_SERIAL to default y option 2016-08-28 13:11:35 +09:00
lpc32xx_hsuart.c serial: lpc32xx hsuart: port driver to driver model 2016-01-13 21:05:22 -05:00
Makefile rockchip: serial: Add an of-platdata driver for rockchip 2016-07-14 20:40:24 -06:00
mcfuart.c m68k: add DM model serial driver 2016-05-17 09:54:43 -06:00
ns16550.c dm: serial: ns16550: Update to support of-platdata 2016-07-14 20:40:24 -06:00
sandbox.c sandbox: serial: Don't sync video in SPL 2016-07-14 20:40:24 -06:00
serial_ar933x.c ar933x: serial: Remove the explicit pinctrl setting 2016-05-21 01:36:38 +02:00
serial_arc.c arc: get rid of running_on_hw 2016-04-11 10:20:30 -07:00
serial_bcm283x_mu.c serial: bcm283x_mu: Detect disabled serial device 2016-09-06 13:18:19 -04:00
serial_bfin.c Use correct spelling of "U-Boot" 2016-02-06 12:00:59 +01:00
serial_efi.c debug_uart: Adjust the declaration of debug_uart_init() 2015-10-21 07:46:50 -06:00
serial_linflexuart.c serial: Introduce linflex uart support 2016-06-13 08:56:02 -04:00
serial_lpuart.c dm: serial: Remove duplicated carriage return character 2016-03-14 15:34:50 -06:00
serial_meson.c arm: add initial support for Amlogic Meson and ODROID-C2 2016-05-27 15:39:47 -04:00
serial_msm.c clk: convert API to match reset/mailbox style 2016-06-19 17:05:55 -06:00
serial_mxc.c serial_mxc: Remove unconditional DCE setting 2016-07-21 10:43:52 +02:00
serial_ns16550.c serial: Remove serial_putc_raw_dev 2016-01-25 10:39:45 -05:00
serial_pic32.c clk: convert API to match reset/mailbox style 2016-06-19 17:05:55 -06:00
serial_pl01x_internal.h dm: serial: Tidy up the pl01x driver 2014-10-22 10:36:57 -06:00
serial_pl01x.c serial: pl01x: Add support for devices with the rate pre-configured. 2016-03-22 12:16:12 -04:00
serial_pxa.c serial: Move carriage return before line feed for some serial drivers 2016-03-14 15:34:50 -06:00
serial_rockchip.c rockchip: serial: Add an of-platdata driver for rockchip 2016-07-14 20:40:24 -06:00
serial_s3c24x0.c serial: Move carriage return before line feed for some serial drivers 2016-03-14 15:34:50 -06:00
serial_s5p.c clk: convert API to match reset/mailbox style 2016-06-19 17:05:55 -06:00
serial_sh.c serial_sh: Add standrad SCI (w/o FIFO) support 2016-07-09 05:51:57 +09:00
serial_sh.h arm: rmobile: Add BLANCHE board support 2016-08-17 10:25:35 +09:00
serial_stm32.c serial: serial_stm32: move clock config from driver to board 2016-02-08 10:10:36 -05:00
serial_stm32x7.c stm32: clk: Add 200MHz clock configuration for stm32f746 discovery board 2016-07-14 18:22:41 -04:00
serial_stm32x7.h stm32x7: add support for stm32x7 serial driver 2016-02-24 18:43:54 -05:00
serial_uniphier.c ARM: uniphier: use (devm_)ioremap() instead of map_sysmem() 2016-07-24 00:13:10 +09:00
serial_xuartlite.c serial: uartlite: Add support for debug console 2016-01-27 15:55:49 +01:00
serial_zynq.c serial: zynq: Read information about clock from DT 2016-07-22 14:04:40 +02:00
serial-uclass.c dm: serial: Add support for of-platdata 2016-07-14 20:40:24 -06:00
serial.c Fix typo: firstly -> first. 2015-12-05 18:22:23 -05:00
usbtty.c serial: Move carriage return before line feed for some serial drivers 2016-03-14 15:34:50 -06:00
usbtty.h omap: clean-up dead configs 2014-08-09 11:17:04 -04:00