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

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Message-ID: <20190318152301.GW9224@smile.fi.intel.com>
Date:   Mon, 18 Mar 2019 17:23:01 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Rushikesh S Kadam <rushikesh.s.kadam@...el.com>
Cc:     lee.jones@...aro.org, bleung@...omium.org,
        enric.balletbo@...labora.com, groeck@...omium.org,
        linux-kernel@...r.kernel.org, gwendal@...gle.com,
        jettrink@...omium.org
Subject: Re: [PATCH v3] mfd: cros_ec: instantiate properly CrOS ISH MCU device

On Fri, Mar 01, 2019 at 01:50:54PM +0530, 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'.

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>

> 
> 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))
> -- 
> 1.9.1
> 

-- 
With Best Regards,
Andy Shevchenko