Re: [PATCH v3] mfd: cros_ec: instantiate properly CrOS ISH MCU device

From: Gwendal Grignou
Date: Fri Mar 01 2019 - 11:19:58 EST


On Fri, Mar 1, 2019 at 1:50 AM Enric Balletbo i Serra
<enric.balletbo@xxxxxxxxxxxxx> wrote:
>
> Hi Rushikesh,
>
> On 1/3/19 9:20, Rushikesh S Kadam wrote:
> > Integrated Sensor Hub (ISH) is also a MCU running EC
> > having feature bit EC_FEATURE_ISH. Instantiate it as
> > a special CrOS EC device with device name 'cros_ish'.
> >
> > Signed-off-by: Rushikesh S Kadam <rushikesh.s.kadam@xxxxxxxxx>
> > ---
> > v3
> > - Dropped "Intel" in commments in cros_ec header file. CrOS EC ISH
> > device is a generic ISH. This was missed earlier.
> > v2
> > - Addressed review comments to term the CrOS EC device as a generic
> > Integrated Sensor Hub.
> > v1
> > - Initial version.
> >
> > drivers/mfd/cros_ec_dev.c | 13 +++++++++++++
> > include/linux/mfd/cros_ec.h | 1 +
> > include/linux/mfd/cros_ec_commands.h | 2 ++
> > 3 files changed, 16 insertions(+)
> >
> > diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> > index 2d0fee4..46963c2 100644
> > --- a/drivers/mfd/cros_ec_dev.c
> > +++ b/drivers/mfd/cros_ec_dev.c
> > @@ -415,6 +415,19 @@ static int ec_device_probe(struct platform_device *pdev)
> > cdev_init(&ec->cdev, &fops);
> >
> > /*
> > + * Check whether this is actually an Integrated Sensor Hub (ISH)
> > + * rather than an EC.
> > + */
> > + if (cros_ec_check_features(ec, EC_FEATURE_ISH)) {
> > + dev_info(dev, "CrOS ISH MCU detected.\n");
> > + /*
> > + * Help userspace differentiating ECs from ISH MCU,
> > + * regardless of the probing order.
> > + */
> > + ec_platform->ec_name = CROS_EC_DEV_ISH_NAME;
> > + }
> > +
> > + /*
> > * Add the class device
> > * Link to the character device for creating the /dev entry
> > * in devtmpfs.
> > diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> > index de8b588..00c5765 100644
> > --- a/include/linux/mfd/cros_ec.h
> > +++ b/include/linux/mfd/cros_ec.h
> > @@ -24,6 +24,7 @@
> >
> > #define CROS_EC_DEV_NAME "cros_ec"
> > #define CROS_EC_DEV_PD_NAME "cros_pd"
> > +#define CROS_EC_DEV_ISH_NAME "cros_ish"
> >
> > /*
> > * The EC is unresponsive for a time after a reboot command. Add a
> > diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> > index fc91082..43bee4f 100644
> > --- a/include/linux/mfd/cros_ec_commands.h
> > +++ b/include/linux/mfd/cros_ec_commands.h
> > @@ -856,6 +856,8 @@ enum ec_feature_code {
> > EC_FEATURE_RTC = 27,
> > /* EC supports CEC commands */
> > EC_FEATURE_CEC = 35,
> > + /* The MCU is an Integrated Sensor Hub */
> > + EC_FEATURE_ISH = 40,
> > };
> >
> > #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
> >
>
> Acked-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
Reviewed-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>>