From: Sven Eckelmann <se@simonwunderlich.de>
Date: Mon, 15 Sep 2025 15:36:16 +0200
Subject: serial: ar933x: Implement CONSOLE_POLL

Signed-off-by: Sven Eckelmann <sven@narfation.org>

diff --git a/target/linux/ath79/patches-5.10/941-serial-ar933x-Implement-CONSOLE_POLL.patch b/target/linux/ath79/patches-5.10/941-serial-ar933x-Implement-CONSOLE_POLL.patch
new file mode 100644
index 0000000000000000000000000000000000000000..48e241f0d8b09b97c473487256b62cf33383a7df
--- /dev/null
+++ b/target/linux/ath79/patches-5.10/941-serial-ar933x-Implement-CONSOLE_POLL.patch
@@ -0,0 +1,87 @@
+From: Sven Eckelmann <sven@narfation.org>
+Date: Mon, 15 Sep 2025 15:35:14 +0200
+Subject: serial: ar933x: Implement CONSOLE_POLL
+
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+
+diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c
+index fcbaff8941930a7700c00adf18412294956fad5e..acf891b50524760c5a648c8e119704182ec94de8 100644
+--- a/drivers/tty/serial/ar933x_uart.c
++++ b/drivers/tty/serial/ar933x_uart.c
+@@ -564,6 +564,65 @@ static int ar933x_uart_verify_port(struct uart_port *port,
+ 	return 0;
+ }
+ 
++
++#ifdef CONFIG_CONSOLE_POLL
++static int ar933x_poll_get_char(struct uart_port *port)
++{
++	struct ar933x_uart_port *up =
++		container_of(port, struct ar933x_uart_port, port);
++	unsigned int rdata;
++	unsigned char ch;
++	u32 imr;
++
++	/* Disable all interrupts */
++	imr = ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
++	ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0);
++
++	rdata = ar933x_uart_read(up, AR933X_UART_DATA_REG);
++	if ((rdata & AR933X_UART_DATA_RX_CSR) == 0) {
++		/* Enable interrupts */
++		ar933x_uart_write(up, AR933X_UART_INT_EN_REG, imr);
++		return NO_POLL_CHAR;
++	}
++
++	/* remove the character from the FIFO */
++	ar933x_uart_write(up, AR933X_UART_DATA_REG,
++			  AR933X_UART_DATA_RX_CSR);
++
++	ch = rdata & AR933X_UART_DATA_TX_RX_MASK;
++
++	/* Enable interrupts */
++	ar933x_uart_write(up, AR933X_UART_INT_EN_REG, imr);
++
++	return ch;
++}
++
++static void ar933x_poll_put_char(struct uart_port *port, unsigned char c)
++{
++	struct ar933x_uart_port *up =
++		container_of(port, struct ar933x_uart_port, port);
++	u32 imr;
++
++	/* Disable all interrupts */
++	imr = ar933x_uart_read(up, AR933X_UART_INT_EN_REG);
++	ar933x_uart_write(up, AR933X_UART_INT_EN_REG, 0);
++
++	/* Wait until FIFO is empty */
++	while (!(ar933x_uart_read(up, AR933X_UART_DATA_REG) & AR933X_UART_DATA_TX_CSR))
++		cpu_relax();
++
++	/* Write a character */
++	ar933x_uart_putc(up, c);
++
++	/* Wait until FIFO is empty */
++	while (!(ar933x_uart_read(up, AR933X_UART_DATA_REG) & AR933X_UART_DATA_TX_CSR))
++		cpu_relax();
++
++	/* Enable interrupts */
++	ar933x_uart_write(up, AR933X_UART_INT_EN_REG, imr);
++}
++#endif
++
+ static const struct uart_ops ar933x_uart_ops = {
+ 	.tx_empty	= ar933x_uart_tx_empty,
+ 	.set_mctrl	= ar933x_uart_set_mctrl,
+@@ -580,6 +639,10 @@ static const struct uart_ops ar933x_uart_ops = {
+ 	.request_port	= ar933x_uart_request_port,
+ 	.config_port	= ar933x_uart_config_port,
+ 	.verify_port	= ar933x_uart_verify_port,
++#ifdef CONFIG_CONSOLE_POLL
++	.poll_get_char	= ar933x_poll_get_char,
++	.poll_put_char	= ar933x_poll_put_char,
++#endif
+ };
+ 
+ static int ar933x_config_rs485(struct uart_port *port,