diff options
| author | Lukas Wunner <[email protected]> | 2020-05-18 16:45:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2020-05-29 12:42:54 +0200 |
| commit | d58a2df3d8877b91ecbfb936a15da364251a228f (patch) | |
| tree | 3d4552397dddb3809888ba9094415ae7eac46239 /net/switchdev/switchdev.c | |
| parent | f40a6be4a4e4985aef5365007e2459d757f26bdd (diff) | |
serial: 8250: Support rs485 bus termination GPIO
Commit e8759ad17d41 ("serial: uapi: Add support for bus termination")
introduced the ability to enable rs485 bus termination from user space.
So far the feature is only used by a single driver, 8250_exar.c, using a
hardcoded GPIO pin specific to Siemens IOT2040 products.
Provide for a more generic solution by allowing specification of an
rs485 bus termination GPIO pin in the device tree: Amend the serial
core to retrieve the GPIO from the device tree (or ACPI table) and amend
the default ->rs485_config() callback for 8250 drivers to change the
GPIO on request from user space.
Perhaps 8250_exar.c can be converted to the generic approach in a
follow-up patch.
Signed-off-by: Lukas Wunner <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Cc: Jan Kiszka <[email protected]>
Link: https://lore.kernel.org/r/94c6c800d1ca9fa04766dd1d43a8272c5ad4bedd.1589811297.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'net/switchdev/switchdev.c')
0 files changed, 0 insertions, 0 deletions