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drivers: serial: lpc11u6x: allow to configure data polarity

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This patch adds support for the rx-invert and tx-invert device-tree
properties to the uart_lpc11u6x driver for USARTs 1, 2, 3 and 4.

Note that this feature is not supported by USART 0.

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
This commit is contained in:
Simon Guinot 2024-07-04 17:15:36 +02:00 committed by Anas Nashif
parent 3416f9ab47
commit 740d7f735e
3 changed files with 27 additions and 1 deletions
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21
drivers/serial/uart_lpc11u6x.c
View file

@ -380,6 +380,11 @@ static void lpc11u6x_uart0_isr_config(const struct device *dev);
PINCTRL_DT_DEFINE(DT_NODELABEL(uart0));
BUILD_ASSERT(DT_PROP(DT_NODELABEL(uart0), rx_invert) == 0,
"rx-invert not supported for UART0");
BUILD_ASSERT(DT_PROP(DT_NODELABEL(uart0), tx_invert) == 0,
"tx-invert not supported for UART0");
static const struct lpc11u6x_uart0_config uart0_config = {
.uart0 = (struct lpc11u6x_uart0_regs *)
DT_REG_ADDR(DT_NODELABEL(uart0)),
@ -568,6 +573,13 @@ static int lpc11u6x_uartx_configure(const struct device *dev,
return -ENOTSUP;
}
if (dev_cfg->rx_invert) {
flags |= LPC11U6X_UARTX_CFG_RXPOL(1);
}
if (dev_cfg->tx_invert) {
flags |= LPC11U6X_UARTX_CFG_TXPOL(1);
}
/* Disable UART */
dev_cfg->base->cfg = 0;
@ -786,6 +798,13 @@ static int lpc11u6x_uartx_init(const struct device *dev)
data->data_bits = UART_CFG_DATA_BITS_8;
data->flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
if (cfg->rx_invert) {
cfg->base->cfg |= LPC11U6X_UARTX_CFG_RXPOL(1);
}
if (cfg->tx_invert) {
cfg->base->cfg |= LPC11U6X_UARTX_CFG_TXPOL(1);
}
/* Enable UART */
cfg->base->cfg = (cfg->base->cfg & LPC11U6X_UARTX_CFG_MASK) |
LPC11U6X_UARTX_CFG_ENABLE;
@ -845,6 +864,8 @@ static const struct lpc11u6x_uartx_config uart_cfg_##idx = { \
.clkid = DT_PHA_BY_IDX(DT_NODELABEL(uart##idx), clocks, 0, clkid), \
.pincfg = PINCTRL_DT_DEV_CONFIG_GET(DT_NODELABEL(uart##idx)), \
.baudrate = DT_PROP(DT_NODELABEL(uart##idx), current_speed), \
.rx_invert = DT_PROP(DT_NODELABEL(uart##idx), rx_invert), \
.tx_invert = DT_PROP(DT_NODELABEL(uart##idx), tx_invert), \
}; \
\
static struct lpc11u6x_uartx_data uart_data_##idx; \

5
drivers/serial/uart_lpc11u6x.h
View file

@ -58,6 +58,9 @@
#define LPC11U6X_UARTX_CFG_STOP_1BIT (0x0 << 6)
#define LPC11U6X_UARTX_CFG_STOP_2BIT (0x1 << 6)
#define LPC11U6X_UARTX_CFG_RXPOL(x) (((x) & 0x1) << 22)
#define LPC11U6X_UARTX_CFG_TXPOL(x) (((x) & 0x1) << 23)
#define LPC11U6X_UARTX_CFG_MASK (0x00FCDAFD)
#define LPC11U6X_UARTX_STAT_RXRDY (1 << 0)
@ -170,6 +173,8 @@ struct lpc11u6x_uartx_config {
const struct device *clock_dev;
uint32_t baudrate;
uint32_t clkid;
bool rx_invert;
bool tx_invert;
const struct pinctrl_dev_config *pincfg;
};

2
dts/bindings/serial/nxp,lpc11u6x-uart.yaml
View file

@ -2,7 +2,7 @@ description: LPC11U6X UART
compatible: "nxp,lpc11u6x-uart"
include: [uart-controller.yaml, pinctrl-device.yaml]
include: [uart-controller.yaml, uart-controller-pin-inversion.yaml, pinctrl-device.yaml]
properties:
reg: