[PATCH 2/6] tty: serial: lpuart: add little endian 32 bit register support

[Dong Aisheng]

It's based on the exist lpuart32 read/write implementation.

Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Jiri Slaby <jsl...@suse.com> (supporter:TTY LAYER)
Cc: Fugang Duan <fugang.d...@nxp.com>
Cc: Stefan Agner <ste...@agner.ch>
Cc: Mingkai Hu <mingkai...@nxp.com>
Cc: Yangbo Lu <yangbo...@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.d...@nxp.com>
---
 drivers/tty/serial/fsl_lpuart.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index cd4e905..bddd041 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -231,6 +231,8 @@
 #define DEV_NAME       "ttyLP"
 #define UART_NR                6
 
+static bool lpuart_is_be;
+
 struct lpuart_port {
        struct uart_port        port;
        struct clk              *clk;
@@ -260,6 +262,7 @@ struct lpuart_port {
 
 struct lpuart_soc_data {
        bool    is_32;
+       bool    is_be;
 };
 
 static struct lpuart_soc_data vf_data = {
@@ -268,6 +271,7 @@ static struct lpuart_soc_data vf_data = {
 
 static struct lpuart_soc_data ls_data = {
        .is_32 = true,
+       .is_be = true,
 };
 
 static const struct of_device_id lpuart_dt_ids[] = {
@@ -282,12 +286,15 @@ static void lpuart_dma_tx_complete(void *arg);
 
 static u32 lpuart32_read(void __iomem *addr)
 {
-       return ioread32be(addr);
+       return lpuart_is_be ? ioread32be(addr) : readl(addr);
 }
 
 static void lpuart32_write(u32 val, void __iomem *addr)
 {
-       iowrite32be(val, addr);
+       if (lpuart_is_be)
+               iowrite32be(val, addr);
+       else
+               writel(val, addr);
 }
 
 static void lpuart_stop_tx(struct uart_port *port)
@@ -2000,6 +2007,7 @@ static int lpuart_probe(struct platform_device *pdev)
        }
        sport->port.line = ret;
        sport->lpuart32 = sdata->is_32;
+       lpuart_is_be = sdata->is_be;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
-- 
2.7.4