Received-SPF: pass (google.com: domain of linux-kernel+bounces-961-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
From: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
To: <git@amd.com>, <michal.simek@amd.com>, <gregkh@linuxfoundation.org>,
	<robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>,
	<conor+dt@kernel.org>, <linux-serial@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<jirislaby@kernel.org>, <linux-arm-kernel@lists.infradead.org>
CC: <radhey.shyam.pandey@amd.com>, <srinivas.goud@amd.com>,
	<shubhrajyoti.datta@amd.com>, <manion05gk@gmail.com>, Manikanta Guntupalli
	<manikanta.guntupalli@amd.com>
Subject: [PATCH V6 0/3] Add rs485 support to uartps driver
Date: Fri, 15 Dec 2023 18:26:24 +0530
Message-ID: <20231215125627.1691573-1-manikanta.guntupalli@amd.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Dec 2023 12:56:50.7399
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 50b33426-d34a-4d1f-2e57-08dbfd6d4e36
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource:
	CY4PEPF0000EDD0.namprd03.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9282

Add reference to rs485.yaml.
Add rs485 support to uartps driver.
---
Changes for V2:
Modify optional gpio name to xlnx,phy-ctrl-gpios.
Update commit description.
Add support for RTS, delay_rts_before_send and delay_rts_after_send in RS485 mode.

Changes for V3:
Modify optional gpio name to rts-gpios.
Update commit description.
Move cdns_uart_tx_empty function to avoid prototype statement.
Remove assignment of struct serial_rs485 to port->rs485 as
serial core performs that.
Switch to native RTS in non GPIO case.
Handle rs485 during stop tx.
Remove explicit calls to configure gpio direction and value,
as devm_gpiod_get_optional performs that by using GPIOD_OUT_LOW argument.
Update implementation to support configuration of GPIO/RTS value
based on user configuration of SER_RS485_RTS_ON_SEND and
SER_RS485_RTS_AFTER_SEND. Move implementation to start_tx from handle_tx.

Changes for V4:
Update rts-gpios description.
Create separate patch for cdns_uart_tx_empty relocation.
Call cdns_rs485_rx_setup() before uart_add_one_port() in probe.
Update gpio descriptor name to gpiod_rts.
Instead of cdns_rs485_config_gpio_rts_high() and
cdns_rs485_config_gpio_rts_low() functions for RTS/GPIO value
configuration implement cdns_rts_gpio_enable().
Disable auto rts and call cdns_uart_stop_tx() from cdns_rs485_config.
Use timer instead of mdelay for delay_rts_before_send and delay_rts_after_send.
Update cdns_uart_set_mctrl to support GPIO/RTS.

Changes for V5:
Remove rts-gpios description.
Update commit message and description.

Changes for V6:
Update commit description.
Disable the TX and RX in cdns_rs485_config() when rs485 disabled.
Hold lock for cdns_uart_handle_tx() in cdns_rs485_tx_callback().

Manikanta Guntupalli (3):
  dt-bindings: Add reference to rs485.yaml
  tty: serial: uartps: Relocate cdns_uart_tx_empty to facilitate rs485
  tty: serial: uartps: Add rs485 support to uartps driver

 .../devicetree/bindings/serial/cdns,uart.yaml |   1 +
 drivers/tty/serial/xilinx_uartps.c            | 252 ++++++++++++++++--
 2 files changed, 229 insertions(+), 24 deletions(-)

-- 
2.25.1