Hi,
On Tue, Oct 16, 2012 at 05:23:20PM +0200, Sebastien Guiriec wrote:
> Some GPIO expanders need some early pin control muxing. Due to
> legacy boards sometimes the driver uses subsys_initcall instead of
> module_init. This patch takes advantage of defer probe feature
> and pin control in order to wait until pin control probing before
> GPIO driver probing. It has been tested on OMAP5 board with TCA6424
> driver.
>
> log:
>
> [0.482299] omap_i2c i2c.15: could not find pctldev for node /ocp/pinmux@4a00
> 2840/pinmux_i2c5_pins, deferring probe
> [0.482330] platform i2c.15: Driver omap_i2c requests probe deferral
> [0.484466] Advanced Linux Sound Architecture Driver Initialized.
>
> [4.746917] omap_i2c i2c.15: bus 4 rev2.4.0 at 100 kHz
> [4.755279] gpiochip_find_base: found new base at 477
> [4.761169] gpiochip_add: registered GPIOs 477 to 500 on device: tca6424a
>
> Signed-off-by: Sebastien Guiriec <s-guiriec@xxxxxx>
looks good to me also, should go in v3.8 merge window:
Reviewed-by: Felipe Balbi <balbi@xxxxxx>
> ---
> drivers/i2c/busses/i2c-omap.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index db31eae..661d8a2 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -44,6 +44,7 @@
> #include <linux/i2c-omap.h>
> #include <linux/pm_runtime.h>
> #include <linux/pm_qos.h>
> +#include <linux/pinctrl/consumer.h>
>
> /* I2C controller revisions */
> #define OMAP_I2C_OMAP1_REV_2 0x20
> @@ -213,6 +214,8 @@ struct omap_i2c_dev {
> u16 syscstate;
> u16 westate;
> u16 errata;
> +
> + struct pinctrl *pins;
> };
>
> static const u8 reg_map_ip_v1[] = {
> @@ -1107,6 +1110,16 @@ omap_i2c_probe(struct platform_device *pdev)
> dev->dtrev = pdata->rev;
> }
>
> + dev->pins = devm_pinctrl_get_select_default(&pdev->dev);
> + if (IS_ERR(dev->pins)) {
> + if (PTR_ERR(dev->pins) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> +
> + dev_warn(&pdev->dev, "did not get pins for i2c error: %li\n",
> + PTR_ERR(dev->pins));
> + dev->pins = NULL;
> + }
> +
> dev->dev = &pdev->dev;
> dev->irq = irq;
>
> --
> 1.7.10.4
>
--
balbi
Attachment:
signature.asc
Description: Digital signature
