linux-kernel - Re: [PATCH 3/4] usb: phy: twl4030: add support for reading restore on ID pin.

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Message-ID: <20150302210431.GH13270@amd>
Date:	Mon, 2 Mar 2015 22:04:31 +0100
From:	Pavel Machek <pavel@....cz>
To:	NeilBrown <neilb@...e.de>
Cc:	Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>,
	Kishon Vijay Abraham I <kishon@...com>,
	linux-omap@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	GTA04 owners <gta04-owner@...delico.com>
Subject: Re: [PATCH 3/4] usb: phy: twl4030: add support for reading restore
 on ID pin.

Hi!

> The twl4030 phy can measure, with low precision, the
> resistance-to-ground of the ID pin.
> 
> Add a function to read the value, and export the result
> via sysfs.
> 
> If the read fails, which it does sometimes, try again in 50msec.
> 
> Signed-off-by: NeilBrown <neilb@...e.de>
> ---
>  drivers/phy/phy-twl4030-usb.c |   63 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 63 insertions(+)
> 
> diff --git a/drivers/phy/phy-twl4030-usb.c b/drivers/phy/phy-twl4030-usb.c
> index 023fe150c7a1..759950898df9 100644
> --- a/drivers/phy/phy-twl4030-usb.c
> +++ b/drivers/phy/phy-twl4030-usb.c
> @@ -374,6 +374,56 @@ static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
>  	}
>  }
>  
> +enum twl4030_id_status {
> +	TWL4030_GROUND,
> +	TWL4030_102K,
> +	TWL4030_200K,
> +	TWL4030_440K,
> +	TWL4030_FLOATING,
> +	TWL4030_ID_UNKNOWN,
> +};
> +static char *twl4030_id_names[] = {
> +	"ground",
> +	"102k",
> +	"200k",
> +	"440k",

New /sys files should be documented somewhere...?

Does it make sense to change "440k" -> "440KOhm"?

Plus I guess you need to update Documentation/

Acked-by: Pavel Machek <pavel@....cz>

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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