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

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Date:   Fri, 1 Mar 2019 08:19:43 -0800
From:   Gwendal Grignou <gwendal@...omium.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Rushikesh S Kadam <rushikesh.s.kadam@...el.com>,
        Lee Jones <lee.jones@...aro.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Jett Rink <jettrink@...omium.org>, andriy.shevchenko@...el.com
Subject: Re: [PATCH v3] mfd: cros_ec: instantiate properly CrOS ISH MCU device

On Fri, Mar 1, 2019 at 1:50 AM Enric Balletbo i Serra
<enric.balletbo@...labora.com> 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@...el.com>
> > ---
> > 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@...labora.com>
Reviewed-by: Gwendal Grignou <gwendal@...omium.org>>