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serial_lpuart: add support for i.MXRT 

Add i.MXRT compatible string and cpu type support to lpuart driver,
to use little endian 32 bits configurations.

Also according to RM, the Receive RX FIFO Enable (RXFE) field in LPUART
FIFO register is bit 3, so this definition should change to 0x08 as done
for i.MX8. It needs also to set baudrate the same way as i.MX8 does.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
This commit is contained in:
Giulio Benetti 2020-01-10 15:51:43 +01:00 committed by Stefano Babic
parent 55631db8bd
commit c32449a161
2 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/serial/serial_lpuart.c
View File

@ -49,7 +49,7 @@
#define FIFO_RXSIZE_MASK 0x7
#define FIFO_RXSIZE_OFF 0
#define FIFO_TXFE 0x80
#ifdef CONFIG_ARCH_IMX8
#if defined(CONFIG_ARCH_IMX8) || defined(CONFIG_ARCH_IMXRT)
#define FIFO_RXFE 0x08
#else
#define FIFO_RXFE 0x40
@ -67,7 +67,8 @@ enum lpuart_devtype {
DEV_VF610 = 1,
DEV_LS1021A,
DEV_MX7ULP,
DEV_IMX8
DEV_IMX8,
DEV_IMXRT,
};
struct lpuart_serial_platdata {
@ -409,7 +410,8 @@ static int _lpuart32_serial_init(struct udevice *dev)
lpuart_write32(plat->flags, &base->match, 0);
if (plat->devtype == DEV_MX7ULP || plat->devtype == DEV_IMX8) {
if (plat->devtype == DEV_MX7ULP || plat->devtype == DEV_IMX8 ||
plat->devtype == DEV_IMXRT) {
_lpuart32_serial_setbrg_7ulp(dev, gd->baudrate);
} else {
/* provide data bits, parity, stop bit, etc */
@ -426,7 +428,8 @@ static int lpuart_serial_setbrg(struct udevice *dev, int baudrate)
struct lpuart_serial_platdata *plat = dev_get_platdata(dev);
if (is_lpuart32(dev)) {
if (plat->devtype == DEV_MX7ULP || plat->devtype == DEV_IMX8)
if (plat->devtype == DEV_MX7ULP || plat->devtype == DEV_IMX8 ||
plat->devtype == DEV_IMXRT)
_lpuart32_serial_setbrg_7ulp(dev, baudrate);
else
_lpuart32_serial_setbrg(dev, baudrate);
@ -530,6 +533,8 @@ static int lpuart_serial_ofdata_to_platdata(struct udevice *dev)
plat->devtype = DEV_VF610;
else if (!fdt_node_check_compatible(blob, node, "fsl,imx8qm-lpuart"))
plat->devtype = DEV_IMX8;
else if (!fdt_node_check_compatible(blob, node, "fsl,imxrt-lpuart"))
plat->devtype = DEV_IMXRT;
return 0;
}
@ -549,6 +554,8 @@ static const struct udevice_id lpuart_serial_ids[] = {
{ .compatible = "fsl,vf610-lpuart"},
{ .compatible = "fsl,imx8qm-lpuart",
.data = LPUART_FLAG_REGMAP_32BIT_REG },
{ .compatible = "fsl,imxrt-lpuart",
.data = LPUART_FLAG_REGMAP_32BIT_REG },
{ }
};

3
include/fsl_lpuart.h
View File

@ -4,7 +4,8 @@
*
*/
#if defined(CONFIG_ARCH_MX7ULP) || defined(CONFIG_ARCH_IMX8)
#if defined(CONFIG_ARCH_MX7ULP) || defined(CONFIG_ARCH_IMX8) || \
defined(CONFIG_ARCH_IMXRT)
struct lpuart_fsl_reg32 {
u32 verid;
u32 param;