Re: [PATCH 7/7] mfd: cros_ec: add RTC as mfd subdevice

Lee Jones
2017-04-03T14:25:19Z

On Fri, 24 Mar 2017, Enric Balletbo i Serra wrote:

> From: Stephen Barber <smbarber@chromium.org>
>
> If the EC supports RTC host commands, expose an RTC device.
>
> Signed-off-by: Stephen Barber <smbarber@chromium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> ---
> drivers/mfd/cros_ec.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index bbc17ab..1ff88b1 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -51,6 +51,11 @@ static const struct mfd_cell ec_pd_cell = {
> .pdata_size = sizeof(pd_p),
> };
>
> +static const struct mfd_cell ec_rtc_cell = {
> + .name = "cros-ec-rtc",
> + .id = -1,

Why -1?

> +};
> +
> static irqreturn_t ec_irq_thread(int irq, void *data)
> {
> struct cros_ec_device *ec_dev = data;
> @@ -238,6 +243,15 @@ static void cros_ec_sensors_register(struct cros_ec_device *ec_dev)
> kfree(msg);
> }
>
> +static void cros_ec_rtc_register(struct cros_ec_device *ec_dev)
> +{
> + int ret;
> +
> + ret = mfd_add_devices(ec_dev->dev, 0, &ec_rtc_cell, 1, NULL, 0, NULL);

Why 0?

> + if (ret)
> + dev_err(ec_dev->dev, "failed to add EC RTC\n");
> +}
> +
> int cros_ec_register(struct cros_ec_device *ec_dev)
> {
> struct device *dev = ec_dev->dev;
> @@ -287,6 +301,10 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
> if (cros_ec_check_features(ec_dev, EC_FEATURE_MOTION_SENSE))
> cros_ec_sensors_register(ec_dev);
>
> + /* Check whether this EC has RTC support */
> + if (cros_ec_check_features(ec_dev, EC_FEATURE_RTC))
> + cros_ec_rtc_register(ec_dev);
> +
> if (ec_dev->max_passthru) {
> /*
> * Register a PD device as well on top of this device.

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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