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linux/drivers/tty/serial/8250
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Matthew Howell 5fdbe136ae serial: exar: Fix GPIO configuration for Sealevel cards based on XR17V35X 
Sealevel XR17V35X based devices are inoperable on kernel versions
4.11 and above due to a change in the GPIO preconfiguration introduced in
commit
7dea8165f1. This patch fixes this by preconfiguring the GPIO on Sealevel
cards to the value (0x00) used prior to commit 7dea8165f1

With GPIOs preconfigured as per commit 7dea8165f1 all ports on
Sealevel XR17V35X based devices become stuck in high impedance
mode, regardless of dip-switch or software configuration. This
causes the device to become effectively unusable. This patch (in
various forms) has been distributed to our customers and no issues
related to it have been reported.

Fixes: 7dea8165f1 ("serial: exar: Preconfigure xr17v35x MPIOs as output")
Signed-off-by: Matthew Howell <matthew.howell@sealevel.com>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2007221605270.13247@tstest-VirtualBox
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-24 10:58:14 +02:00
..
8250_accent.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_acorn.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_aspeed_vuart.c serial: 8250: Check UPF_IRQ_SHARED in advance 2020-02-12 11:56:44 -08:00
8250_bcm2835aux.c serial: 8250_bcm2835aux: Support rs485 software emulation 2020-03-07 09:52:02 +01:00
8250_boca.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_core.c serial: 8250: fix null-ptr-deref in serial8250_start_tx() 2020-07-21 21:23:18 +02:00
8250_dma.c serial: 8250: factor out serial8250_{set,clear}_THRI() helpers 2019-06-18 09:36:55 +02:00
8250_dw.c serial: 8250_dw: Avoid double error messaging when IRQ absent 2019-11-04 17:45:31 +01:00
8250_dwlib.c serial: 8250_dw: split Synopsys DesignWare 8250 common functions 2019-09-04 12:43:52 +02:00
8250_dwlib.h tty: serial: Use the correct style for SPDX License Identifier 2020-03-07 09:52:01 +01:00
8250_early.c serial: 8250_early: Support kgdboc_earlycon 2020-06-02 15:15:46 +01:00
8250_em.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
8250_exar_st16c554.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_exar.c serial: exar: Fix GPIO configuration for Sealevel cards based on XR17V35X 2020-07-24 10:58:14 +02:00
8250_fintek.c serial: 8250_fintek: Add F81966 Support 2020-05-29 13:00:54 +02:00
8250_fourport.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_fsl.c tty/serial: Migrate 8250_fsl to use has_sysrq 2019-12-18 15:04:42 +01:00
8250_gsc.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
8250_hp300.c tty: add SPDX identifiers to all remaining files in drivers/tty/ 2017-11-08 13:08:12 +01:00
8250_hub6.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_ingenic.c Serial: Ingenic: Add support for the X1000. 2019-01-30 09:31:30 +01:00
8250_ioc3.c Fix up remaining devm_ioremap_nocache() in SGI IOC3 8250 UART driver 2020-02-08 14:19:39 -08:00
8250_lpc18xx.c tty: Remove dev_err() usage after platform_get_irq() 2019-09-04 12:43:49 +02:00
8250_lpss.c serial: 8250_lpss: Add ->setup() for Elkhart Lake ports 2020-03-06 13:31:19 +01:00
8250_men_mcb.c drivers: mcb: use symbol namespaces 2019-11-03 19:54:53 +01:00
8250_mid.c tty: serial: Remove redundant license text 2017-11-08 13:08:12 +01:00
8250_mtk.c serial: 8250_mtk: Fix high-speed baud rates clamping 2020-07-21 21:23:18 +02:00
8250_of.c serial: 8250: Generalize rs485 software emulation 2020-03-07 09:52:02 +01:00
8250_omap.c TTY/Serial patches for 5.7-rc1 2020-03-31 16:18:55 -07:00
8250_pci.c serial: 8250_pci: Move Pericom IDs to pci_ids.h 2020-05-08 16:54:09 -05:00
8250_pnp.c serial: 8250_pnp: Move to struct dev_pm_ops 2019-09-04 12:43:46 +02:00
8250_port.c serial: 8250: Support rs485 bus termination GPIO 2020-05-29 12:42:54 +02:00
8250_pxa.c serial: 8250_pxa: avoid autodetecting the port type 2020-02-19 11:38:57 +01:00
8250_tegra.c serial: 8250_tegra: Create Tegra specific 8250 driver 2020-02-10 12:34:44 -08:00
8250_uniphier.c tty: Remove dev_err() usage after platform_get_irq() 2019-09-04 12:43:49 +02:00
8250.h serial: 8250: Generalize rs485 software emulation 2020-03-07 09:52:02 +01:00
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile serial: 8250_tegra: Create Tegra specific 8250 driver 2020-02-10 12:34:44 -08:00
serial_cs.c drivers/tty: remove redundant assignment to variable i and rename it to ret 2020-04-16 16:12:34 +02:00