On Mon, Jul 04, 2011 at 09:33:20AM +0200, Uwe Kleine-K?nig wrote:

On Mon, Jul 04, 2011 at 10:19:25AM +0800, Shawn Guo wrote:

quoted

Hi Grant,

Thanks for the review.

On Sun, Jul 03, 2011 at 03:10:07PM -0600, Grant Likely wrote:

quoted

On Sun, Jul 03, 2011 at 03:55:59PM +0800, Shawn Guo wrote:

quoted

The patch removes all the uses of cpu_is_mx1().  Instead, it uses
the .id_table of platform_driver to distinguish the uart device type.

Signed-off-by: Shawn Guo <redacted>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Alan Cox <redacted>
---
 arch/arm/mach-imx/clock-imx1.c                |    6 +-
 arch/arm/plat-mxc/devices/platform-imx-uart.c |    2 +-
 drivers/tty/serial/imx.c                      |   51 ++++++++++++++++++++++--
 3 files changed, 50 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-imx/clock-imx1.c b/arch/arm/mach-imx/clock-imx1.c
index dcc4172..4aabeb2 100644
--- a/arch/arm/mach-imx/clock-imx1.c
+++ b/arch/arm/mach-imx/clock-imx1.c

@@ -587,9 +587,9 @@ static struct clk_lookup lookups[] __initdata = {
 	_REGISTER_CLOCK(NULL, "mma", mma_clk)
 	_REGISTER_CLOCK("imx_udc.0", NULL, usbd_clk)
 	_REGISTER_CLOCK(NULL, "gpt", gpt_clk)
-	_REGISTER_CLOCK("imx-uart.0", NULL, uart_clk)
-	_REGISTER_CLOCK("imx-uart.1", NULL, uart_clk)
-	_REGISTER_CLOCK("imx-uart.2", NULL, uart_clk)
+	_REGISTER_CLOCK("imx1-uart.0", NULL, uart_clk)
+	_REGISTER_CLOCK("imx1-uart.1", NULL, uart_clk)
+	_REGISTER_CLOCK("imx1-uart.2", NULL, uart_clk)
 	_REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
 	_REGISTER_CLOCK("imx1-cspi.0", NULL, spi_clk)
 	_REGISTER_CLOCK("imx1-cspi.1", NULL, spi_clk)

diff --git a/arch/arm/plat-mxc/devices/platform-imx-uart.c b/arch/arm/plat-mxc/devices/platform-imx-uart.c
index cfce8c9..477271a 100644
--- a/arch/arm/plat-mxc/devices/platform-imx-uart.c
+++ b/arch/arm/plat-mxc/devices/platform-imx-uart.c

@@ -152,7 +152,7 @@ struct platform_device *__init imx_add_imx_uart_3irq(
 		},
 	};
 
-	return imx_add_platform_device("imx-uart", data->id, res,
+	return imx_add_platform_device("imx1-uart", data->id, res,
 			ARRAY_SIZE(res), pdata, sizeof(*pdata));
 }
 

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 22fe801..983f3bd 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c

@@ -48,7 +48,6 @@
 
 #include <asm/io.h>
 #include <asm/irq.h>
-#include <mach/hardware.h>
 #include <mach/imx-uart.h>
 
 /* Register definitions */

@@ -67,7 +66,8 @@
 #define UBMR  0xa8 /* BRM Modulator Register */
 #define UBRC  0xac /* Baud Rate Count Register */
 #define MX2_ONEMS 0xb0 /* One Millisecond register */
-#define UTS (cpu_is_mx1() ? 0xd0 : 0xb4) /* UART Test Register */
+#define MX1_UTS 0xd0 /* UART Test Register on mx1 */
+#define MX2_UTS 0xb4 /* UART Test Register on mx2 and later */
 
 /* UART Control Register Bit Fields.*/
 #define  URXD_CHARRDY    (1<<15)

@@ -181,6 +181,17 @@
 
 #define UART_NR 8
 
+enum imx_uart_type {
+	IMX1_UART,
+	IMX2_UART,
+};
+
+/* device type dependent stuff */
+struct imx_uart_data {
+	unsigned uts_reg;
+	enum imx_uart_type devtype;
+};
+
 struct imx_port {
 	struct uart_port	port;
 	struct timer_list	timer;

@@ -192,6 +203,7 @@ struct imx_port {
 	unsigned int		irda_inv_tx:1;
 	unsigned short		trcv_delay; /* transceiver delay */
 	struct clk		*clk;
+	struct imx_uart_data	*devdata;
 };
 
 #ifdef CONFIG_IRDA

@@ -200,6 +212,33 @@ struct imx_port {
 #define USE_IRDA(sport)	(0)
 #endif
 
+#define UTS (sport->devdata->uts_reg)
+#define IS_IMX1_UART() (sport->devdata->devtype == IMX1_UART)
+#define IS_IMX2_UART() (sport->devdata->devtype == IMX2_UART)
+
+static struct imx_uart_data imx_uart_devdata[] = {
+	[IMX1_UART] = {
+		.uts_reg = MX1_UTS,
+		.devtype = IMX1_UART,
+	},
+	[IMX2_UART] = {
+		.uts_reg = MX2_UTS,
+		.devtype = IMX2_UART,
+	},
+};
+
+static struct platform_device_id imx_uart_devtype[] = {
+	{
+		.name = "imx1-uart",
+		.driver_data = IMX1_UART,
+	}, {
+		.name = "imx-uart",
+		.driver_data = IMX2_UART,

It feels strange to introduce IMX2 today meaning
i.MX{21,25,27,31,35,50,51,53}. I didn't check the changes in detail, but
if the only relevant change is that the UTS register is at a different

No, it's not the only relevant change.  The patch also changes a couple of
'if (!cpu_is_imx1())' to 'if (IS_IMX2_UART())'.

The 'IMX2' in 'IMX2_UART' does not necessarily mean i.MX{21,25,27,
31,35,50,51,53}.  It actually means i.MX{21,25,27,31,35,50,51,53} all
have the same UART block which was firstly introduced on IMX2.

It's actually a change respecting the existing code, which defines
MX2_ONEMS for all imx except imx1.

-- 
Regards,
Shawn