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From 558ca1294aa2bf7f29d55361d2f18c6dc534e1d6 Mon Sep 17 00:00:00 2001
From: Biwen Li <biwen.li@nxp.com>
Date: Tue, 30 Oct 2018 18:28:33 +0800
Subject: [PATCH 39/40] uart: support layerscape
This is an integrated patch of uart for layerscape
Signed-off-by: Sriram Dash <Sriram.dash@nxp.com>
Signed-off-by: Yuan Yao <yao.yuan@nxp.com>
Signed-off-by: Biwen Li <biwen.li@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -236,6 +236,8 @@
/* IMX lpuart has four extra unused regs located at the beginning */
#define IMX_REG_OFF 0x10
+static DECLARE_BITMAP(linemap, UART_NR);
+
struct lpuart_port {
struct uart_port port;
struct clk *clk;
@@ -2153,13 +2155,13 @@ static int lpuart_probe(struct platform_
ret = of_alias_get_id(np, "serial");
if (ret < 0) {
- dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
- return ret;
- }
- if (ret >= ARRAY_SIZE(lpuart_ports)) {
- dev_err(&pdev->dev, "serial%d out of range\n", ret);
- return -EINVAL;
+ ret = find_first_zero_bit(linemap, UART_NR);
+ if (ret >= UART_NR) {
+ dev_err(&pdev->dev, "port line is full, add device failed\n");
+ return ret;
+ }
}
+ set_bit(ret, linemap);
sport->port.line = ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
@@ -2250,6 +2252,7 @@ static int lpuart_remove(struct platform
struct lpuart_port *sport = platform_get_drvdata(pdev);
uart_remove_one_port(&lpuart_reg, &sport->port);
+ clear_bit(sport->port.line, linemap);
clk_disable_unprepare(sport->clk);
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