linux-kernel - Re: [PATCH v2 03/10] mfd: cros_ec: Instantiate sub-devices from device tree

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Message-ID: <20150513113200.GJ3394@x1>
Date:	Wed, 13 May 2015 12:32:00 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Olof Johansson <olof@...om.net>,
	Doug Anderson <dianders@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Simon Glass <sjg@...gle.com>,
	Gwendal Grignou <gwendal@...gle.com>,
	Stephen Barber <smbarber@...omium.org>,
	Filipe Brandenburger <filbranden@...gle.com>,
	Todd Broch <tbroch@...omium.org>,
	Alexandru M Stan <amstan@...omium.org>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/10] mfd: cros_ec: Instantiate sub-devices from
 device tree

On Sat, 09 May 2015, Javier Martinez Canillas wrote:

> From: Todd Broch <tbroch@...omium.org>
> 
> If the EC device tree node has sub-nodes, try to instantiate them as
> MFD sub-devices.  We can configure the EC features provided by the board.
> 
> Signed-off-by: Todd Broch <tbroch@...omium.org>
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> Tested-by: Heiko Stuebner <heiko@...ech.de>
> Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
> Tested-by: Gwendal Grignou <gwendal@...omium.org>
> ---
> 
> Changes since v1:
>   - Added Heiko Stuebner and Gwendal Grignou Tested-by tag
>   - Added Gwendal Grignou Reviewed-by tag
>   - Use automatic device ID instead of 1 as suggested by Lee Jones
>   - Remove #ifdeffery and check for of_node to register sub-devices
>     Suggested by Lee Jones
> ---
>  drivers/mfd/cros_ec.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index c4aecc6f8373..1574a9352a6d 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -17,6 +17,7 @@
>   * battery charging and regulator control, firmware update.
>   */
>  
> +#include <linux/of_platform.h>
>  #include <linux/interrupt.h>
>  #include <linux/slab.h>
>  #include <linux/module.h>
> @@ -109,18 +110,8 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer);
>  
>  static const struct mfd_cell cros_devs[] = {
>  	{
> -		.name = "cros-ec-keyb",
> -		.id = 1,
> -		.of_compatible = "google,cros-ec-keyb",
> -	},
> -	{
> -		.name = "cros-ec-i2c-tunnel",
> -		.id = 2,
> -		.of_compatible = "google,cros-ec-i2c-tunnel",
> -	},
> -	{
>  		.name = "cros-ec-ctl",
> -		.id = 3,
> +		.id = PLATFORM_DEVID_AUTO,
>  	},
>  };
>  
> @@ -150,6 +141,15 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>  		return err;
>  	}
>  
> +	if (IS_ENABLED(CONFIG_OF) && dev->of_node) {

You don't need to check for OF.  of_node will be NULL if OF isn't
enabled.

> +		err = of_platform_populate(dev->of_node, NULL, NULL, dev);
> +		if (err) {
> +			mfd_remove_devices(dev);
> +			dev_err(dev, "Failed to register sub-devices\n");
> +			return err;
> +		}
> +	}
> +
>  	dev_info(dev, "Chrome EC device registered\n");
>  
>  	return 0;

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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