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tty: serial: uartps: Add support for uartps controller reset

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Add support for an optional reset for the uartps controller using
the reset driver. If the uartps node contains the "resets" property,
then cdns_uart_startup performs uartps controller non-pulse out of reset
and reset in exit path.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Link: https://lore.kernel.org/r/20240425062358.1347684-4-manikanta.guntupalli@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manikanta Guntupalli 2024-04-25 11:53:58 +05:30 committed by Greg Kroah-Hartman
parent b433768501
commit e3896be240
1 changed files with 15 additions and 0 deletions
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15
drivers/tty/serial/xilinx_uartps.c
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@ -25,6 +25,7 @@
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/reset.h>
#define CDNS_UART_TTY_NAME "ttyPS"
#define CDNS_UART_NAME "xuartps"
@ -198,6 +199,7 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
* @gpiod_rts: Pointer to the gpio descriptor
* @rs485_tx_started: RS485 tx state
* @tx_timer: Timer for tx
* @rstc: Pointer to the reset control
*/
struct cdns_uart {
struct uart_port *port;
@ -211,6 +213,7 @@ struct cdns_uart {
struct gpio_desc *gpiod_rts;
bool rs485_tx_started;
struct hrtimer tx_timer;
struct reset_control *rstc;
};
struct cdns_platform_data {
u32 quirks;
@ -948,6 +951,10 @@ static int cdns_uart_startup(struct uart_port *port)
is_brk_support = cdns_uart->quirks & CDNS_UART_RXBS_SUPPORT;
ret = reset_control_deassert(cdns_uart->rstc);
if (ret)
return ret;
uart_port_lock_irqsave(port, &flags);
/* Disable the TX and RX */
@ -1721,6 +1728,13 @@ static int cdns_uart_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
}
cdns_uart_data->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
if (IS_ERR(cdns_uart_data->rstc)) {
rc = PTR_ERR(cdns_uart_data->rstc);
dev_err_probe(&pdev->dev, rc, "Cannot get UART reset\n");
goto err_out_unregister_driver;
}
rc = clk_prepare_enable(cdns_uart_data->pclk);
if (rc) {
dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
@ -1881,6 +1895,7 @@ static void cdns_uart_remove(struct platform_device *pdev)
if (console_port == port)
console_port = NULL;
#endif
reset_control_assert(cdns_uart_data->rstc);
if (!--instances)
uart_unregister_driver(cdns_uart_data->cdns_uart_driver);