linux-kernel - Re: [PATCH] phy: cpcap-usb: Add CPCAP PMIC USB support

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Message-ID: <20170322215935.GG10760@atomide.com>
Date:   Wed, 22 Mar 2017 14:59:36 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>
Subject: Re: [PATCH] phy: cpcap-usb: Add CPCAP PMIC USB support

* Sebastian Reichel <sre@...nel.org> [170321 19:20]:
> Hi,
> 
> On Thu, Mar 16, 2017 at 08:51:52PM -0700, Tony Lindgren wrote:
> > Some Motorola phones like droid 4 use a custom CPCAP PMIC that has a
> > multiplexing USB PHY.
> > 
> > This USB PHY can operate at least in four modes using pin multiplexing
> > and two control GPIOS:
> > 
> > - Pass through companion PHY for the SoC USB PHY
> > - ULPI PHY for the SoC
> > - Pass through USB for the modem
> > - UART debug console for the SoC
> > 
> > This patch adds support for droid 4 USB PHY and debug UART modes,
> > support for other modes can be added later on as needed.
> > 
> > Both peripheral and host mode are working for the USB. The
> > host mode depends on the cpcap-charger driver for VBUS.
> > 
> > VBUS and ID pin detection are done using cpcap-adc IIO ADC
> > driver.
> 
> I tested UART, USB slave (cdc-ether) & USB host (keyboard & touchpad
> from Atrix lapdock) mode with Droid 4:
> 
> Tested-by: Sebastian Reichel <sre@...nel.org>

Thanks for testing. I'll repost v2 shortly with a minor change to
use iio_read_channel_processed() instead of iio_read_channel_scale()
as the ADC values are processed in the driver and not scaled by
the IIO framework.

Regards,

Tony