linux-kernel - Re: [PATCH v3 1/2] i2c: xiic: Add OF support for Xilinx i2c bus interface

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Message-ID: <AANLkTi=NLhAiyznBbKjSf7tpeGrGi7NOK2cHUWhfNzG-@mail.gmail.com>
Date:	Tue, 22 Feb 2011 11:11:26 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Michal Simek <monstr@...str.eu>
Cc:	linux-i2c@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	john.williams@...alogix.com, linux-kernel@...r.kernel.org,
	John.Linn@...inx.com, Ben Dooks <ben-linux@...ff.org>
Subject: Re: [PATCH v3 1/2] i2c: xiic: Add OF support for Xilinx i2c bus interface

[cc'ing Ben Dooks, embedded i2c maintainer]

On Tue, Feb 22, 2011 at 10:49 AM, Michal Simek <monstr@...str.eu> wrote:
> Add OF support to Xilinx i2c bus interface.
> It is used on Microblaze systems.
>
> Signed-off-by: Michal Simek <monstr@...str.eu>

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

Ben, since this one depends on a patch in my tree, do you want me to pick it up?

g.

> ---
>  drivers/i2c/busses/i2c-xiic.c |   37 +++++++++++++++++++++++++++++--------
>  1 files changed, 29 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
> index a9c419e..0b7647b 100644
> --- a/drivers/i2c/busses/i2c-xiic.c
> +++ b/drivers/i2c/busses/i2c-xiic.c
> @@ -41,6 +41,11 @@
>  #include <linux/io.h>
>  #include <linux/slab.h>
>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_i2c.h>
> +#include <linux/of_address.h>

Nit: This should not be separate from the rest of the include block.
The blank line between slab.h and of.h can be dropped.

> +
>  #define DRIVER_NAME "xiic-i2c"
>
>  enum xilinx_i2c_state {
> @@ -426,7 +431,7 @@ static void xiic_process(struct xiic_i2c *i2c)
>                        xiic_wakeup(i2c, STATE_ERROR);
>
>        } else if (pend & (XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK)) {
> -               /* Transmit register/FIFO is empty or ½ empty */
> +               /* Transmit register/FIFO is empty or 1/2 empty */
>
>                clr = pend &
>                        (XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_HALF_MASK);
> @@ -704,10 +709,6 @@ static int __devinit xiic_i2c_probe(struct platform_device *pdev)
>        if (irq < 0)
>                goto resource_missing;
>
> -       pdata = (struct xiic_i2c_platform_data *) pdev->dev.platform_data;
> -       if (!pdata)
> -               return -EINVAL;
> -
>        i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
>        if (!i2c)
>                return -ENOMEM;
> @@ -730,6 +731,7 @@ static int __devinit xiic_i2c_probe(struct platform_device *pdev)
>        i2c->adap = xiic_adapter;
>        i2c_set_adapdata(&i2c->adap, i2c);
>        i2c->adap.dev.parent = &pdev->dev;
> +       i2c->adap.dev.of_node = of_node_get(pdev->dev.of_node);
>
>        xiic_reinit(i2c);
>
> @@ -748,9 +750,16 @@ static int __devinit xiic_i2c_probe(struct platform_device *pdev)
>                goto add_adapter_failed;
>        }
>
> -       /* add in known devices to the bus */
> -       for (i = 0; i < pdata->num_devices; i++)
> -               i2c_new_device(&i2c->adap, pdata->devices + i);
> +       dev_info(&pdev->dev, "mapped to 0x%08X, irq=%d\n",
> +                                       (unsigned int)i2c->base, irq);
> +
> +       pdata = (struct xiic_i2c_platform_data *) pdev->dev.platform_data;

While you're touching this code anyway, the cast is unnecessary.

> +       if (pdata) {
> +               /* add in known devices to the bus */
> +               for (i = 0; i < pdata->num_devices; i++)
> +                       i2c_new_device(&i2c->adap, pdata->devices + i);
> +       }
> +       of_i2c_register_devices(&i2c->adap);
>
>        return 0;
>
> @@ -799,12 +808,24 @@ static int __devexit xiic_i2c_remove(struct platform_device* pdev)
>  /* work with hotplug and coldplug */
>  MODULE_ALIAS("platform:"DRIVER_NAME);
>
> +#ifdef CONFIG_OF
> +/* Match table for of_platform binding */
> +static struct of_device_id __devinitdata xilinx_iic_of_match[] = {
> +       { .compatible = "xlnx,xps-iic-2.00.a", },
> +       {},
> +};
> +MODULE_DEVICE_TABLE(of, xilinx_iic_of_match);
> +#else
> +# define xilinx_iic_of_match NULL
> +#endif
> +
>  static struct platform_driver xiic_i2c_driver = {
>        .probe   = xiic_i2c_probe,
>        .remove  = __devexit_p(xiic_i2c_remove),
>        .driver  = {
>                .owner = THIS_MODULE,
>                .name = DRIVER_NAME,
> +               .of_match_table = xilinx_iic_of_match,
>        },
>  };
>
> --
> 1.5.5.6
>
> --
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-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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