On Wed, Nov 24, 2010 at 7:09 AM, Jonas Bonn <jonas@xxxxxxxxxxxx> wrote:
> This patch adapts the i2c-ocores driver for being defined and configured via
> a device tree description.
>
> The device tree bits need to be protected by CONFIG_OF guards as this is
> still an optional feature.
>
> Signed-off-by: Jonas Bonn <jonas@xxxxxxxxxxxx>
> ---
> drivers/i2c/busses/i2c-ocores.c | 63 ++++++++++++++++++++++++++++++++++-----
> 1 files changed, 55 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
> index 0070371..86a536c 100644
> --- a/drivers/i2c/busses/i2c-ocores.c
> +++ b/drivers/i2c/busses/i2c-ocores.c
> @@ -210,6 +210,31 @@ static struct i2c_adapter ocores_adapter = {
> .algo = &ocores_algorithm,
> };
>
> +#ifdef CONFIG_OF
> +static int ocores_i2c_of_probe(struct platform_device* pdev,
> + struct ocores_i2c* i2c)
> +{
> + int* val;
__be32 *val;
> +
> + val = (int*) of_get_property(pdev->dev.of_node, "regstep", NULL);
of_get_property returns a void*. Drop the unnecessary cast.
> + if (!val) {
> + dev_err(&pdev->dev, "Missing required paramter 'regstep'");
spelling: parameter
> + return -ENODEV;
> + }
> +
> + i2c->regstep = *val;
i2c->regstep = be32_to_cpup(val);
> + val = (int*) of_get_property(pdev->dev.of_node, "clock_khz", NULL);
Drop the cast. It is also considered bad form to use '_' in property
names. Use '-' instead. Traditionally, clock frequencies are
specified in Hz (not kHz), and the property name is something like
'bus-frequency' or 'clock-frequency'.
> + if (!val) {
> + dev_err(&pdev->dev, "Missing required paramter 'clock_khz'");
> + return -ENODEV;
> + }
> + i2c->clock_khz = *val;
i2c->clock_khz = be32_to_cpup(val);
> +
> + return 0;
> +}
> +#else
> +#define ocores_i2c_of_probe(pdev,i2c) -ENODEV
> +#endif
>
> static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> {
> @@ -227,10 +252,6 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> if (!res2)
> return -ENODEV;
>
> - pdata = (struct ocores_i2c_platform_data*) pdev->dev.platform_data;
> - if (!pdata)
> - return -ENODEV;
> -
> i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
> if (!i2c)
> return -ENOMEM;
> @@ -249,8 +270,16 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> goto map_failed;
> }
>
> - i2c->regstep = pdata->regstep;
> - i2c->clock_khz = pdata->clock_khz;
> + pdata = (struct ocores_i2c_platform_data*) pdev->dev.platform_data;
Drop the unnecessary cast
> + if (pdata) {
> + i2c->regstep = pdata->regstep;
> + i2c->clock_khz = pdata->clock_khz;
> + } else {
> + ret = ocores_i2c_of_probe(pdev, i2c);
> + if (ret)
> + return ret;
> + }
> +
> ocores_init(i2c);
>
> init_waitqueue_head(&i2c->wait);
> @@ -265,6 +294,9 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> i2c->adap = ocores_adapter;
> i2c_set_adapdata(&i2c->adap, i2c);
> i2c->adap.dev.parent = &pdev->dev;
> +#ifdef CONFIG_OF
> + i2c->adap.dev.of_node = pdev->dev.of_node;
> +#endif
>
> /* add i2c adapter to i2c tree */
> ret = i2c_add_adapter(&i2c->adap);
> @@ -274,8 +306,10 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> }
>
> /* add in known devices to the bus */
> - for (i = 0; i < pdata->num_devices; i++)
> - i2c_new_device(&i2c->adap, pdata->devices + i);
> + if (pdata) {
> + for (i = 0; i < pdata->num_devices; i++)
> + i2c_new_device(&i2c->adap, pdata->devices + i);
> + }
>
> return 0;
>
> @@ -344,6 +378,16 @@ static int ocores_i2c_resume(struct platform_device *pdev)
> #define ocores_i2c_resume NULL
> #endif
>
> +#ifdef CONFIG_OF
> +static struct of_device_id ocores_i2c_match[] = {
> + {
> + .compatible = "opencores,i2c-ocores",
Is this binding documented somewhere? If not, you can use devicetree.org
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, ocores_i2c_match);
> +#endif
> +
> /* work with hotplug and coldplug */
> MODULE_ALIAS("platform:ocores-i2c");
>
> @@ -355,6 +399,9 @@ static struct platform_driver ocores_i2c_driver = {
> .driver = {
> .owner = THIS_MODULE,
> .name = "ocores-i2c",
> +#ifdef CONFIG_OF
> + .of_match_table = ocores_i2c_match,
> +#endif
> },
> };
>
> --
> 1.7.1
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@xxxxxxxxxxxxxxxx
> https://lists.ozlabs.org/listinfo/devicetree-discuss
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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