linux-kernel - [PATCH V2 1/6] tty: serial: lpuart: introduce lpuart_soc

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Date:   Mon, 15 May 2017 15:48:54 +0800
From:   Dong Aisheng <aisheng.dong@....com>
To:     <linux-serial@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>, <jslaby@...e.com>,
        <fugang.duan@....com>, <stefan@...er.ch>, <dongas86@...il.com>,
        <Mingkai.Hu@....com>, <yangbo.lu@....com>,
        Dong Aisheng <aisheng.dong@....com>
Subject: [PATCH V2 1/6] tty: serial: lpuart: introduce lpuart_soc_data to represent SoC property

This is used to dynamically check the SoC specific lpuart properies.
Currently only the checking of 32 bit register width is added which
functions the same as before. More will be added later for supporting
new chips.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: Stefan Agner <stefan@...er.ch>
Cc: Mingkai Hu <Mingkai.Hu@....com>
Cc: Yangbo Lu <yangbo.lu@....com>
Acked-by: Fugang Duan <fugang.duan@....com>
Signed-off-by: Dong Aisheng <aisheng.dong@....com>

---
ChangeLog:
v1->v2:
 * make all soc_data const
---
 drivers/tty/serial/fsl_lpuart.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 15df1ba7..7204103 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -258,13 +258,21 @@ struct lpuart_port {
 	wait_queue_head_t	dma_wait;
 };
 
+struct lpuart_soc_data {
+	bool	is_32;
+};
+
+static const struct lpuart_soc_data vf_data = {
+	.is_32 = false,
+};
+
+static const struct lpuart_soc_data ls_data = {
+	.is_32 = true,
+};
+
 static const struct of_device_id lpuart_dt_ids[] = {
-	{
-		.compatible = "fsl,vf610-lpuart",
-	},
-	{
-		.compatible = "fsl,ls1021a-lpuart",
-	},
+	{ .compatible = "fsl,vf610-lpuart", .data = &vf_data, },
+	{ .compatible = "fsl,ls1021a-lpuart", .data = &ls_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, lpuart_dt_ids);
@@ -1971,6 +1979,9 @@ static struct uart_driver lpuart_reg = {
 
 static int lpuart_probe(struct platform_device *pdev)
 {
+	const struct of_device_id *of_id = of_match_device(lpuart_dt_ids,
+							   &pdev->dev);
+	const struct lpuart_soc_data *sdata = of_id->data;
 	struct device_node *np = pdev->dev.of_node;
 	struct lpuart_port *sport;
 	struct resource *res;
@@ -1988,7 +1999,7 @@ static int lpuart_probe(struct platform_device *pdev)
 		return ret;
 	}
 	sport->port.line = ret;
-	sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart");
+	sport->lpuart32 = sdata->is_32;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	sport->port.membase = devm_ioremap_resource(&pdev->dev, res);
-- 
2.7.4