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| author | Farouk Bouabid <farouk.bouabid@theobroma-systems.com> | 2024-02-08 16:39:56 +0100 |
|---|---|---|
| committer | Heiko Stuebner <heiko@sntech.de> | 2024-02-13 20:05:47 +0100 |
| commit | 5963d97aa780619ffb66cf4886c0ca1175ccbd3e (patch) | |
| tree | becb5306fdff82e5c9c6f84601b1a25dc353b03f /tools/perf/scripts/python/syscall-counts.py | |
| parent | 54448f711aa32f176534bbd7b1903cc6d1c8a50d (diff) | |
arm64: dts: rockchip: add rs485 support on uart5 of px30-ringneck-haikou
A hardware switch can set the rs485 transceiver into half or full duplex
mode.
Switching to the half-duplex mode requires the user to enable em485 on
uart5 using ioctl, DE/RE are both connected to GPIO0_B5 which is the
RTS signal for uart0. Implement GPIO0_B5 as rts-gpios with RTS_ON_SEND
option enabled (default) so that driver mode gets enabled while sending
(RTS high) and receiver mode gets enabled while not sending (RTS low).
In full-duplex mode (em485 is disabled), DE is connected to GPIO0_B5 and
RE is grounded (enabled). Since GPIO0_B5 is implemented as rts-gpios, the
driver mode gets enabled whenever we want to send something and RE is not
affected (always enabled) in this case by the state of RTS.
Signed-off-by: Farouk Bouabid <farouk.bouabid@theobroma-systems.com>
Link: https://lore.kernel.org/r/20240208-dev-rx-enable-v6-2-39e68e17a339@theobroma-systems.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions