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From:   Songjun Wu <songjun.wu@linux.intel.com>
To:     yixin.zhu@linux.intel.com, chuanhua.lei@linux.intel.com,
        hauke.mehrtens@intel.com
Cc:     gregkh@linuxfoundation.org, paul.burton@mips.com, jslaby@suse.com,
        Songjun Wu <songjun.wu@linux.intel.com>,
        linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Subject: [RESEND PATCH 03/14] serial: lantiq: Get serial id from dts
Date:   Tue, 16 Oct 2018 17:19:04 +0800
Message-Id: <20181016091915.19909-4-songjun.wu@linux.intel.com>
In-Reply-To: <20181016091915.19909-1-songjun.wu@linux.intel.com>
References: <20181016091915.19909-1-songjun.wu@linux.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Get serial id from dts, also keep backward compatible when dts is not
updated.

Signed-off-by: Songjun Wu <songjun.wu@linux.intel.com>
---

 drivers/tty/serial/lantiq.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/lantiq.c b/drivers/tty/serial/lantiq.c
index 044128277248..66c671677761 100644
--- a/drivers/tty/serial/lantiq.c
+++ b/drivers/tty/serial/lantiq.c
@@ -688,7 +688,7 @@ lqasc_probe(struct platform_device *pdev)
 	struct ltq_uart_port *ltq_port;
 	struct uart_port *port;
 	struct resource *mmres, irqres[3];
-	int line = 0;
+	int line;
 	int ret;
 
 	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -699,9 +699,20 @@ lqasc_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	/* check if this is the console port */
-	if (mmres->start != CPHYSADDR(LTQ_EARLY_ASC))
-		line = 1;
+	/* get serial id */
+	line = of_alias_get_id(node, "serial");
+	if (line < 0) {
+		if (IS_ENABLED(CONFIG_LANTIQ)) {
+			if (mmres->start == CPHYSADDR(LTQ_EARLY_ASC))
+				line = 0;
+			else
+				line = 1;
+		} else {
+			dev_err(&pdev->dev, "failed to get alias id, errno %d\n",
+				line);
+			return line;
+		}
+	}
 
 	if (lqasc_port[line]) {
 		dev_err(&pdev->dev, "port %d already allocated\n", line);
-- 
2.11.0