2023-06-06 15:57:26

by Tim Harvey

Subject: [PATCH] arm64: dts: imx8mm-venice-gw7904: enable UART1 hardware flow control

On the GW7904 uart1 can use UART3_TX/RX for hardware flow control
which was the desired default configuration. Remove uart3 and configure
uart1 for hardware flow control.

Signed-off-by: Tim Harvey <[email protected]>
---
.../dts/freescale/imx8mm-venice-gw7904.dts | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts
index 93088fa1c3b9..c12e3f4f800f 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-venice-gw7904.dts
@@ -636,6 +636,8 @@ &pgc_mipi {
&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart1>;
+ cts-gpios = <&gpio5 26 GPIO_ACTIVE_LOW>;
+ rts-gpios = <&gpio5 27 GPIO_ACTIVE_LOW>;
status = "okay";
};

@@ -646,13 +648,6 @@ &uart2 {
status = "okay";
};

-/* off-board RS232 */
-&uart3 {
- pinctrl-names = "default";
- pinctrl-0 = <&pinctrl_uart3>;
- status = "okay";
-};
-
&usbotg1 {
dr_mode = "host";
disable-over-current;
@@ -814,6 +809,8 @@ pinctrl_uart1: uart1grp {
fsl,pins = <
MX8MM_IOMUXC_UART1_RXD_UART1_DCE_RX 0x140
MX8MM_IOMUXC_UART1_TXD_UART1_DCE_TX 0x140
+ MX8MM_IOMUXC_UART3_RXD_GPIO5_IO26 0x140 /* CTS# in */
+ MX8MM_IOMUXC_UART3_TXD_GPIO5_IO27 0x140 /* RTS# out */
>;
};

@@ -824,13 +821,6 @@ MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140
>;
};

- pinctrl_uart3: uart3grp {
- fsl,pins = <
- MX8MM_IOMUXC_UART3_RXD_UART3_DCE_RX 0x140
- MX8MM_IOMUXC_UART3_TXD_UART3_DCE_TX 0x140
- >;
- };
-
pinctrl_usdhc2: usdhc2grp {
fsl,pins = <
MX8MM_IOMUXC_SD2_CLK_USDHC2_CLK 0x190
--
2.25.1

2023-07-17 00:21:37

by Shawn Guo

Subject: Re: [PATCH] arm64: dts: imx8mm-venice-gw7904: enable UART1 hardware flow control

On Tue, Jun 06, 2023 at 08:38:19AM -0700, Tim Harvey wrote:
> On the GW7904 uart1 can use UART3_TX/RX for hardware flow control
> which was the desired default configuration. Remove uart3 and configure
> uart1 for hardware flow control.
>
> Signed-off-by: Tim Harvey <[email protected]>

Applied, thanks!