Patchwork [v2,1/2] serial/imx: get rid of the uses of cpu_is_mx1()

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Submitter Shawn Guo
Date July 5, 2011, 3:05 p.m.
Message ID <1309878338-25697-2-git-send-email-shawn.guo@linaro.org>
Download mbox | patch
Permalink /patch/103318/
State New
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Comments

Shawn Guo - July 5, 2011, 3:05 p.m.
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.

A couple of !cpu_is_mx1() logic gets turned into IS_IMX_UART, as the
codes wrapped there are really IMX specific.

It also removes macro MX1_UCR3_REF25 and MX1_UCR3_REF30 which are
not used anywhere.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
---
 arch/arm/mach-imx/clock-imx1.c                |    6 +-
 arch/arm/plat-mxc/devices/platform-imx-uart.c |    2 +-
 drivers/tty/serial/imx.c                      |   65 ++++++++++++++++++++-----
 3 files changed, 56 insertions(+), 17 deletions(-)
Grant Likely - July 5, 2011, 5:27 p.m.
On Tue, Jul 5, 2011 at 9:05 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> 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.
>
> A couple of !cpu_is_mx1() logic gets turned into IS_IMX_UART, as the
> codes wrapped there are really IMX specific.
>
> It also removes macro MX1_UCR3_REF25 and MX1_UCR3_REF30 which are
> not used anywhere.
>
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>

Acked-by: Grant Likely <grant.likely@secretlab.ca>

Who's tree is this one going to get merged through?

g.

> ---
>  arch/arm/mach-imx/clock-imx1.c                |    6 +-
>  arch/arm/plat-mxc/devices/platform-imx-uart.c |    2 +-
>  drivers/tty/serial/imx.c                      |   65 ++++++++++++++++++++-----
>  3 files changed, 56 insertions(+), 17 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..ddebb5c 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 */
> @@ -66,8 +65,9 @@
>  #define UBIR  0xa4 /* BRM Incremental Register */
>  #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 IMX_ONEMS 0xb0 /* One Millisecond register */
> +#define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */
> +#define IMX_UTS 0xb4 /* UART Test Register on all other i.mx*/
>
>  /* UART Control Register Bit Fields.*/
>  #define  URXD_CHARRDY    (1<<15)
> @@ -87,7 +87,7 @@
>  #define  UCR1_RTSDEN     (1<<5)         /* RTS delta interrupt enable */
>  #define  UCR1_SNDBRK     (1<<4)         /* Send break */
>  #define  UCR1_TDMAEN     (1<<3)         /* Transmitter ready DMA enable */
> -#define  MX1_UCR1_UARTCLKEN  (1<<2)     /* UART clock enabled, mx1 only */
> +#define  IMX1_UCR1_UARTCLKEN  (1<<2)  /* UART clock enabled, i.mx1 only */
>  #define  UCR1_DOZE       (1<<1)         /* Doze */
>  #define  UCR1_UARTEN     (1<<0)         /* UART enabled */
>  #define  UCR2_ESCI              (1<<15) /* Escape seq interrupt enable */
> @@ -113,9 +113,7 @@
>  #define  UCR3_RXDSEN    (1<<6)  /* Receive status interrupt enable */
>  #define  UCR3_AIRINTEN   (1<<5)  /* Async IR wake interrupt enable */
>  #define  UCR3_AWAKEN    (1<<4)  /* Async wake interrupt enable */
> -#define  MX1_UCR3_REF25         (1<<3)  /* Ref freq 25 MHz, only on mx1 */
> -#define  MX1_UCR3_REF30         (1<<2)  /* Ref Freq 30 MHz, only on mx1 */
> -#define  MX2_UCR3_RXDMUXSEL     (1<<2)  /* RXD Muxed Input Select, on mx2/mx3 */
> +#define  IMX_UCR3_RXDMUXSEL     (1<<2)  /* RXD Muxed Input Select */
>  #define  UCR3_INVT      (1<<1)  /* Inverted Infrared transmission */
>  #define  UCR3_BPEN      (1<<0)  /* Preset registers enable */
>  #define  UCR4_CTSTL_SHF  10      /* CTS trigger level shift */
> @@ -181,6 +179,17 @@
>
>  #define UART_NR 8
>
> +enum imx_uart_type {
> +       IMX1_UART,
> +       IMX_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 +201,7 @@ 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 +210,33 @@ 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_IMX_UART()  (sport->devdata->devtype == IMX_UART)
> +
> +static struct imx_uart_data imx_uart_devdata[] = {
> +       [IMX1_UART] = {
> +               .uts_reg = IMX1_UTS,
> +               .devtype = IMX1_UART,
> +       },
> +       [IMX_UART] = {
> +               .uts_reg = IMX_UTS,
> +               .devtype = IMX_UART,
> +       },
> +};
> +
> +static struct platform_device_id imx_uart_devtype[] = {
> +       {
> +               .name = "imx1-uart",
> +               .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART],
> +       }, {
> +               .name = "imx-uart",
> +               .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX_UART],
> +       }, {
> +               /* sentinel */
> +       }
> +};
> +
>  /*
>  * Handle any change of modem status signal since we were last called.
>  */
> @@ -689,9 +726,9 @@ static int imx_startup(struct uart_port *port)
>                }
>        }
>
> -       if (!cpu_is_mx1()) {
> +       if (IS_IMX_UART()) {
>                temp = readl(sport->port.membase + UCR3);
> -               temp |= MX2_UCR3_RXDMUXSEL;
> +               temp |= IMX_UCR3_RXDMUXSEL;
>                writel(temp, sport->port.membase + UCR3);
>        }
>
> @@ -923,9 +960,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
>        writel(num, sport->port.membase + UBIR);
>        writel(denom, sport->port.membase + UBMR);
>
> -       if (!cpu_is_mx1())
> +       if (IS_IMX_UART())
>                writel(sport->port.uartclk / div / 1000,
> -                               sport->port.membase + MX2_ONEMS);
> +                               sport->port.membase + IMX_ONEMS);
>
>        writel(old_ucr1, sport->port.membase + UCR1);
>
> @@ -1062,8 +1099,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
>        ucr1 = old_ucr1 = readl(sport->port.membase + UCR1);
>        old_ucr2 = readl(sport->port.membase + UCR2);
>
> -       if (cpu_is_mx1())
> -               ucr1 |= MX1_UCR1_UARTCLKEN;
> +       if (IS_IMX1_UART())
> +               ucr1 |= IMX1_UCR1_UARTCLKEN;
>        ucr1 |= UCR1_UARTEN;
>        ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
>
> @@ -1262,6 +1299,7 @@ static int serial_imx_probe(struct platform_device *pdev)
>        init_timer(&sport->timer);
>        sport->timer.function = imx_timeout;
>        sport->timer.data     = (unsigned long)sport;
> +       sport->devdata = (struct imx_uart_data  *) pdev->id_entry->driver_data;
>
>        sport->clk = clk_get(&pdev->dev, "uart");
>        if (IS_ERR(sport->clk)) {
> @@ -1340,6 +1378,7 @@ static struct platform_driver serial_imx_driver = {
>
>        .suspend        = serial_imx_suspend,
>        .resume         = serial_imx_resume,
> +       .id_table       = imx_uart_devtype,
>        .driver         = {
>                .name   = "imx-uart",
>                .owner  = THIS_MODULE,
> --
> 1.7.4.1
>
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
>
Shawn Guo - July 6, 2011, 5:53 a.m.
On Tue, Jul 05, 2011 at 11:27:55AM -0600, Grant Likely wrote:
> On Tue, Jul 5, 2011 at 9:05 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> > 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.
> >
> > A couple of !cpu_is_mx1() logic gets turned into IS_IMX_UART, as the
> > codes wrapped there are really IMX specific.
> >
> > It also removes macro MX1_UCR3_REF25 and MX1_UCR3_REF30 which are
> > not used anywhere.
> >
> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > Cc: Sascha Hauer <s.hauer@pengutronix.de>
> > Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
> 
> Acked-by: Grant Likely <grant.likely@secretlab.ca>
> 
> Who's tree is this one going to get merged through?
> 
I think it will be easier to go Sascha's tree.  Alan, Sascha, what
do you think?
Sascha Hauer - July 6, 2011, 6:36 a.m.
On Tue, Jul 05, 2011 at 11:27:55AM -0600, Grant Likely wrote:
> On Tue, Jul 5, 2011 at 9:05 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> > 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.
> >
> > A couple of !cpu_is_mx1() logic gets turned into IS_IMX_UART, as the
> > codes wrapped there are really IMX specific.
> >
> > It also removes macro MX1_UCR3_REF25 and MX1_UCR3_REF30 which are
> > not used anywhere.
> >
> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > Cc: Sascha Hauer <s.hauer@pengutronix.de>
> > Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
> 
> Acked-by: Grant Likely <grant.likely@secretlab.ca>
> 
> Who's tree is this one going to get merged through?

Before we merge this through any tree I'd like to have a policy how
the bindings are named. With the gpio part we agreed that we name
the bindings after the oldest i.MX they are compatible with. For example
the last change in the gpios was on the i.MX31, so every newer i.MX
claims to be compatible with this the i.MX31.

The patch below instead follows the approach that the currently newest
i.MX gets a generic name (imx-uart instead of imx21-uart). This decision
may look silly when another change to the uart core comes and we have
given the generic name to some arbitrary version of the core.

I really like to have a consistent scheme across all devices and we have
the same problem with spi, nand and several others.

Sascha

> 
> g.
> 
> > ---
> >  arch/arm/mach-imx/clock-imx1.c                |    6 +-
> >  arch/arm/plat-mxc/devices/platform-imx-uart.c |    2 +-
> >  drivers/tty/serial/imx.c                      |   65 ++++++++++++++++++++-----
> >  3 files changed, 56 insertions(+), 17 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..ddebb5c 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 */
> > @@ -66,8 +65,9 @@
> >  #define UBIR  0xa4 /* BRM Incremental Register */
> >  #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 IMX_ONEMS 0xb0 /* One Millisecond register */
> > +#define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */
> > +#define IMX_UTS 0xb4 /* UART Test Register on all other i.mx*/
> >
> >  /* UART Control Register Bit Fields.*/
> >  #define  URXD_CHARRDY    (1<<15)
> > @@ -87,7 +87,7 @@
> >  #define  UCR1_RTSDEN     (1<<5)         /* RTS delta interrupt enable */
> >  #define  UCR1_SNDBRK     (1<<4)         /* Send break */
> >  #define  UCR1_TDMAEN     (1<<3)         /* Transmitter ready DMA enable */
> > -#define  MX1_UCR1_UARTCLKEN  (1<<2)     /* UART clock enabled, mx1 only */
> > +#define  IMX1_UCR1_UARTCLKEN  (1<<2)  /* UART clock enabled, i.mx1 only */
> >  #define  UCR1_DOZE       (1<<1)         /* Doze */
> >  #define  UCR1_UARTEN     (1<<0)         /* UART enabled */
> >  #define  UCR2_ESCI              (1<<15) /* Escape seq interrupt enable */
> > @@ -113,9 +113,7 @@
> >  #define  UCR3_RXDSEN    (1<<6)  /* Receive status interrupt enable */
> >  #define  UCR3_AIRINTEN   (1<<5)  /* Async IR wake interrupt enable */
> >  #define  UCR3_AWAKEN    (1<<4)  /* Async wake interrupt enable */
> > -#define  MX1_UCR3_REF25         (1<<3)  /* Ref freq 25 MHz, only on mx1 */
> > -#define  MX1_UCR3_REF30         (1<<2)  /* Ref Freq 30 MHz, only on mx1 */
> > -#define  MX2_UCR3_RXDMUXSEL     (1<<2)  /* RXD Muxed Input Select, on mx2/mx3 */
> > +#define  IMX_UCR3_RXDMUXSEL     (1<<2)  /* RXD Muxed Input Select */
> >  #define  UCR3_INVT      (1<<1)  /* Inverted Infrared transmission */
> >  #define  UCR3_BPEN      (1<<0)  /* Preset registers enable */
> >  #define  UCR4_CTSTL_SHF  10      /* CTS trigger level shift */
> > @@ -181,6 +179,17 @@
> >
> >  #define UART_NR 8
> >
> > +enum imx_uart_type {
> > +       IMX1_UART,
> > +       IMX_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 +201,7 @@ 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 +210,33 @@ 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_IMX_UART()  (sport->devdata->devtype == IMX_UART)
> > +
> > +static struct imx_uart_data imx_uart_devdata[] = {
> > +       [IMX1_UART] = {
> > +               .uts_reg = IMX1_UTS,
> > +               .devtype = IMX1_UART,
> > +       },
> > +       [IMX_UART] = {
> > +               .uts_reg = IMX_UTS,
> > +               .devtype = IMX_UART,
> > +       },
> > +};
> > +
> > +static struct platform_device_id imx_uart_devtype[] = {
> > +       {
> > +               .name = "imx1-uart",
> > +               .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART],
> > +       }, {
> > +               .name = "imx-uart",
> > +               .driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX_UART],
> > +       }, {
> > +               /* sentinel */
> > +       }
> > +};
> > +
> >  /*
> >  * Handle any change of modem status signal since we were last called.
> >  */
> > @@ -689,9 +726,9 @@ static int imx_startup(struct uart_port *port)
> >                }
> >        }
> >
> > -       if (!cpu_is_mx1()) {
> > +       if (IS_IMX_UART()) {
> >                temp = readl(sport->port.membase + UCR3);
> > -               temp |= MX2_UCR3_RXDMUXSEL;
> > +               temp |= IMX_UCR3_RXDMUXSEL;
> >                writel(temp, sport->port.membase + UCR3);
> >        }
> >
> > @@ -923,9 +960,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
> >        writel(num, sport->port.membase + UBIR);
> >        writel(denom, sport->port.membase + UBMR);
> >
> > -       if (!cpu_is_mx1())
> > +       if (IS_IMX_UART())
> >                writel(sport->port.uartclk / div / 1000,
> > -                               sport->port.membase + MX2_ONEMS);
> > +                               sport->port.membase + IMX_ONEMS);
> >
> >        writel(old_ucr1, sport->port.membase + UCR1);
> >
> > @@ -1062,8 +1099,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
> >        ucr1 = old_ucr1 = readl(sport->port.membase + UCR1);
> >        old_ucr2 = readl(sport->port.membase + UCR2);
> >
> > -       if (cpu_is_mx1())
> > -               ucr1 |= MX1_UCR1_UARTCLKEN;
> > +       if (IS_IMX1_UART())
> > +               ucr1 |= IMX1_UCR1_UARTCLKEN;
> >        ucr1 |= UCR1_UARTEN;
> >        ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
> >
> > @@ -1262,6 +1299,7 @@ static int serial_imx_probe(struct platform_device *pdev)
> >        init_timer(&sport->timer);
> >        sport->timer.function = imx_timeout;
> >        sport->timer.data     = (unsigned long)sport;
> > +       sport->devdata = (struct imx_uart_data  *) pdev->id_entry->driver_data;
> >
> >        sport->clk = clk_get(&pdev->dev, "uart");
> >        if (IS_ERR(sport->clk)) {
> > @@ -1340,6 +1378,7 @@ static struct platform_driver serial_imx_driver = {
> >
> >        .suspend        = serial_imx_suspend,
> >        .resume         = serial_imx_resume,
> > +       .id_table       = imx_uart_devtype,
> >        .driver         = {
> >                .name   = "imx-uart",
> >                .owner  = THIS_MODULE,
> > --
> > 1.7.4.1
> >
> >
> > _______________________________________________
> > devicetree-discuss mailing list
> > devicetree-discuss@lists.ozlabs.org
> > https://lists.ozlabs.org/listinfo/devicetree-discuss
> >
> 
> 
> 
> -- 
> Grant Likely, B.Sc., P.Eng.
> Secret Lab Technologies Ltd.
>
Shawn Guo - July 6, 2011, 6:57 a.m.
On Wed, Jul 06, 2011 at 08:36:48AM +0200, Sascha Hauer wrote:
> On Tue, Jul 05, 2011 at 11:27:55AM -0600, Grant Likely wrote:
> > On Tue, Jul 5, 2011 at 9:05 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> > > 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.
> > >
> > > A couple of !cpu_is_mx1() logic gets turned into IS_IMX_UART, as the
> > > codes wrapped there are really IMX specific.
> > >
> > > It also removes macro MX1_UCR3_REF25 and MX1_UCR3_REF30 which are
> > > not used anywhere.
> > >
> > > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > > Cc: Sascha Hauer <s.hauer@pengutronix.de>
> > > Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
> > 
> > Acked-by: Grant Likely <grant.likely@secretlab.ca>
> > 
> > Who's tree is this one going to get merged through?
> 
> Before we merge this through any tree I'd like to have a policy how
> the bindings are named. With the gpio part we agreed that we name
> the bindings after the oldest i.MX they are compatible with. For example
> the last change in the gpios was on the i.MX31, so every newer i.MX
> claims to be compatible with this the i.MX31.
> 
> The patch below instead follows the approach that the currently newest
> i.MX gets a generic name (imx-uart instead of imx21-uart). This decision
> may look silly when another change to the uart core comes and we have
> given the generic name to some arbitrary version of the core.
> 
> I really like to have a consistent scheme across all devices and we have
> the same problem with spi, nand and several others.
> 
Makes sense.  Will fix it in v3.

Patch

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..ddebb5c 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 */
@@ -66,8 +65,9 @@ 
 #define UBIR  0xa4 /* BRM Incremental Register */
 #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 IMX_ONEMS 0xb0 /* One Millisecond register */
+#define IMX1_UTS 0xd0 /* UART Test Register on i.mx1 */
+#define IMX_UTS 0xb4 /* UART Test Register on all other i.mx*/
 
 /* UART Control Register Bit Fields.*/
 #define  URXD_CHARRDY    (1<<15)
@@ -87,7 +87,7 @@ 
 #define  UCR1_RTSDEN     (1<<5)	 /* RTS delta interrupt enable */
 #define  UCR1_SNDBRK     (1<<4)	 /* Send break */
 #define  UCR1_TDMAEN     (1<<3)	 /* Transmitter ready DMA enable */
-#define  MX1_UCR1_UARTCLKEN  (1<<2)	 /* UART clock enabled, mx1 only */
+#define  IMX1_UCR1_UARTCLKEN  (1<<2)  /* UART clock enabled, i.mx1 only */
 #define  UCR1_DOZE       (1<<1)	 /* Doze */
 #define  UCR1_UARTEN     (1<<0)	 /* UART enabled */
 #define  UCR2_ESCI     	 (1<<15) /* Escape seq interrupt enable */
@@ -113,9 +113,7 @@ 
 #define  UCR3_RXDSEN	 (1<<6)  /* Receive status interrupt enable */
 #define  UCR3_AIRINTEN   (1<<5)  /* Async IR wake interrupt enable */
 #define  UCR3_AWAKEN	 (1<<4)  /* Async wake interrupt enable */
-#define  MX1_UCR3_REF25 	 (1<<3)  /* Ref freq 25 MHz, only on mx1 */
-#define  MX1_UCR3_REF30 	 (1<<2)  /* Ref Freq 30 MHz, only on mx1 */
-#define  MX2_UCR3_RXDMUXSEL	 (1<<2)  /* RXD Muxed Input Select, on mx2/mx3 */
+#define  IMX_UCR3_RXDMUXSEL	 (1<<2)  /* RXD Muxed Input Select */
 #define  UCR3_INVT  	 (1<<1)  /* Inverted Infrared transmission */
 #define  UCR3_BPEN  	 (1<<0)  /* Preset registers enable */
 #define  UCR4_CTSTL_SHF  10      /* CTS trigger level shift */
@@ -181,6 +179,17 @@ 
 
 #define UART_NR 8
 
+enum imx_uart_type {
+	IMX1_UART,
+	IMX_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 +201,7 @@  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 +210,33 @@  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_IMX_UART()	(sport->devdata->devtype == IMX_UART)
+
+static struct imx_uart_data imx_uart_devdata[] = {
+	[IMX1_UART] = {
+		.uts_reg = IMX1_UTS,
+		.devtype = IMX1_UART,
+	},
+	[IMX_UART] = {
+		.uts_reg = IMX_UTS,
+		.devtype = IMX_UART,
+	},
+};
+
+static struct platform_device_id imx_uart_devtype[] = {
+	{
+		.name = "imx1-uart",
+		.driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX1_UART],
+	}, {
+		.name = "imx-uart",
+		.driver_data = (kernel_ulong_t) &imx_uart_devdata[IMX_UART],
+	}, {
+		/* sentinel */
+	}
+};
+
 /*
  * Handle any change of modem status signal since we were last called.
  */
@@ -689,9 +726,9 @@  static int imx_startup(struct uart_port *port)
 		}
 	}
 
-	if (!cpu_is_mx1()) {
+	if (IS_IMX_UART()) {
 		temp = readl(sport->port.membase + UCR3);
-		temp |= MX2_UCR3_RXDMUXSEL;
+		temp |= IMX_UCR3_RXDMUXSEL;
 		writel(temp, sport->port.membase + UCR3);
 	}
 
@@ -923,9 +960,9 @@  imx_set_termios(struct uart_port *port, struct ktermios *termios,
 	writel(num, sport->port.membase + UBIR);
 	writel(denom, sport->port.membase + UBMR);
 
-	if (!cpu_is_mx1())
+	if (IS_IMX_UART())
 		writel(sport->port.uartclk / div / 1000,
-				sport->port.membase + MX2_ONEMS);
+				sport->port.membase + IMX_ONEMS);
 
 	writel(old_ucr1, sport->port.membase + UCR1);
 
@@ -1062,8 +1099,8 @@  imx_console_write(struct console *co, const char *s, unsigned int count)
 	ucr1 = old_ucr1 = readl(sport->port.membase + UCR1);
 	old_ucr2 = readl(sport->port.membase + UCR2);
 
-	if (cpu_is_mx1())
-		ucr1 |= MX1_UCR1_UARTCLKEN;
+	if (IS_IMX1_UART())
+		ucr1 |= IMX1_UCR1_UARTCLKEN;
 	ucr1 |= UCR1_UARTEN;
 	ucr1 &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
 
@@ -1262,6 +1299,7 @@  static int serial_imx_probe(struct platform_device *pdev)
 	init_timer(&sport->timer);
 	sport->timer.function = imx_timeout;
 	sport->timer.data     = (unsigned long)sport;
+	sport->devdata = (struct imx_uart_data	*) pdev->id_entry->driver_data;
 
 	sport->clk = clk_get(&pdev->dev, "uart");
 	if (IS_ERR(sport->clk)) {
@@ -1340,6 +1378,7 @@  static struct platform_driver serial_imx_driver = {
 
 	.suspend	= serial_imx_suspend,
 	.resume		= serial_imx_resume,
+	.id_table	= imx_uart_devtype,
 	.driver		= {
 		.name	= "imx-uart",
 		.owner	= THIS_MODULE,