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authorDong Aisheng <aisheng.dong@nxp.com>2017-06-13 10:55:52 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-29 17:12:34 +0200
commit24b1e5f0e83c2aced8096473d20c4cf6c1355f30 (patch)
treed2e12a752f6d06393830f6ad44facecb511e5187 /drivers/tty
parentf2422fe43790204b98d3de823c332477b38242f7 (diff)
downloadlinux-24b1e5f0e83c2aced8096473d20c4cf6c1355f30.tar.bz2
tty: serial: lpuart: add imx7ulp support
The lpuart of imx7ulp is basically the same as ls1021a. It's also 32 bit width register, but unlike ls1021a, it's little endian. Besides that, imx7ulp lpuart has a minor different register layout from ls1021a that it has four extra registers (verid, param, global, pincfg) located at the beginning of register map, which are currently not used by the driver and less to be used later. To ease the register difference handling, we add a reg_off member in lpuart_soc_data structure to represent if the normal lpuart32_{read|write} requires plus a offset to hide the issue. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: Stefan Agner <stefan@agner.ch> Cc: Mingkai Hu <Mingkai.Hu@nxp.com> Cc: Yangbo Lu <yangbo.lu@nxp.com> Cc: Fugang Duan <fugang.duan@nxp.com> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/fsl_lpuart.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index ed0bf180ceb4..94863333f48b 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -231,6 +231,9 @@
#define DEV_NAME "ttyLP"
#define UART_NR 6
+/* IMX lpuart has four extra unused regs located at the beginning */
+#define IMX_REG_OFF 0x10
+
struct lpuart_port {
struct uart_port port;
struct clk *clk;
@@ -259,6 +262,7 @@ struct lpuart_port {
struct lpuart_soc_data {
char iotype;
+ u8 reg_off;
};
static const struct lpuart_soc_data vf_data = {
@@ -269,9 +273,15 @@ static const struct lpuart_soc_data ls_data = {
.iotype = UPIO_MEM32BE,
};
+static struct lpuart_soc_data imx_data = {
+ .iotype = UPIO_MEM32,
+ .reg_off = IMX_REG_OFF,
+};
+
static const struct of_device_id lpuart_dt_ids[] = {
{ .compatible = "fsl,vf610-lpuart", .data = &vf_data, },
{ .compatible = "fsl,ls1021a-lpuart", .data = &ls_data, },
+ { .compatible = "fsl,imx7ulp-lpuart", .data = &imx_data, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
@@ -2019,6 +2029,7 @@ static int lpuart_probe(struct platform_device *pdev)
if (IS_ERR(sport->port.membase))
return PTR_ERR(sport->port.membase);
+ sport->port.membase += sdata->reg_off;
sport->port.mapbase = res->start;
sport->port.dev = &pdev->dev;
sport->port.type = PORT_LPUART;