linux-kernel - Re: [PATCH v4] extcon: add Maxim MAX3355 driver

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Date:	Fri, 18 Dec 2015 22:17:14 -0600
From:	Rob Herring <robh@...nel.org>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v4] extcon: add Maxim MAX3355 driver

On Fri, Dec 18, 2015 at 01:47:14AM +0300, Sergei Shtylyov wrote:
> Maxim Integrated MAX3355E chip integrates a charge pump and comparators to
> enable a system with an integrated USB OTG dual-role transceiver to
> function as an USB OTG dual-role device. In addition to sensing/controlling
> Vbus, the chip also passes thru the ID signal from the USB OTG connector.
> On some Renesas boards, this signal is just fed into the SoC thru a GPIO
> pin -- there's no real OTG controller, only host and gadget USB controllers
> sharing the same USB bus; however, we'd like to allow host or gadget
> drivers to be loaded depending on the cable type, hence the need for the
> MAX3355 extcon driver. The Vbus status signals are also wired to GPIOs
> (however, we aren't currently interested in them), the OFFVBUS# signal is
> controlled by the host controllers, there's also the SHDN# signal wired to
> a GPIO, it should be driven high for the normal operation.
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
> 
> ---
> The patch is against the 'extcon-next' branch of the 'extcon.git' repo.
> 
> Changes in version 4:
> - stopped calling kstrdup() for the device name;
> - removed unneeded 'owner' field initializer;
> - moved devm_extcon_allocate() call further down in the probe() method;
> - extended the driver copyright;
> - indented the continuation lines in the binding document.
> 
> Changes in version 3:
> - reformatted the change log.
> 
> Changes in version 2:
> - added the USB gadget cable support;
> - added the remove() driver method which drives SHDN# GPIO low to save power;
> - dropped vendor prefix from the ID GPIO property name;
> - changed the GPIO property name suffix to "-gpios";
> - switched to usign extcon_set_cable_state_() API;
> - switched to using the gpiod/sleeping 'gpiolib' APIs;
> - addded error messages to max3355_probe();
> - added IRQF_NO_SUSPEND flasg to the devm_request_threaded_irq() call;
> - renamed 'ret' variable to 'err' in max3355_probe();
> - expanded the Kconfig entry help text;
> - added vendor name to the patch summary, the bindings document, the Kconfig
>   entry, the driver heading comment, the module description, and the change log;
> - fixed up and reformatted the change log.
> 
>  Documentation/devicetree/bindings/extcon/extcon-max3355.txt |   21 +

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/extcon/Kconfig                                      |    8 
>  drivers/extcon/Makefile                                     |    1 
>  drivers/extcon/extcon-max3355.c                             |  151 ++++++++++++
>  4 files changed, 181 insertions(+)
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