linux-kernel - Re: [PATCH 2/2] usb: misc: usb5744: Add support for USB hub controller

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Date:   Tue, 9 Feb 2021 11:11:54 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Simek <michal.simek@...inx.com>
CC:     <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
        <git@...inx.com>, Piyush Mehta <piyush.mehta@...inx.com>,
        Al Cooper <alcooperx@...il.com>,
        "Alan Stern" <stern@...land.harvard.edu>,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Bastien Nocera <hadess@...ess.net>,
        "Masahiro Yamada" <masahiroy@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 2/2] usb: misc: usb5744: Add support for USB hub
 controller



On 2/9/21 11:03 AM, Greg Kroah-Hartman wrote:
> On Tue, Feb 09, 2021 at 10:53:20AM +0100, Michal Simek wrote:
>> From: Piyush Mehta <piyush.mehta@...inx.com>
>>
>> This patch adds a USB GPIO based hub reset for USB5744 hub. This usb5744
>> driver trigger hub reset signal after soft reset or core Reset. The HUB
>> needs to be resetted after completion of phy initialization. After the
>> toggling of gpio, hub configure using i2c usb attached command.
>>
>> USB5744 hub can be used without any I2C connection, is handled by a
>> simple platform device driver.
>>
>> As part of the reset, sets the direction of the pin to output before
>> toggling the pin. Delay of millisecond is added in between low and
>> high to meet the setup and hold time requirement of the reset.
>>
>> Signed-off-by: Piyush Mehta <piyush.mehta@...inx.com>
>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>> ---
>>
>>  MAINTAINERS                |   1 +
>>  drivers/usb/misc/Kconfig   |   9 +++
>>  drivers/usb/misc/Makefile  |   1 +
>>  drivers/usb/misc/usb5744.c | 115 +++++++++++++++++++++++++++++++++++++
>>  4 files changed, 126 insertions(+)
>>  create mode 100644 drivers/usb/misc/usb5744.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 7439471b5d37..56d1fcdd24f6 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -2706,6 +2706,7 @@ F:	drivers/edac/synopsys_edac.c
>>  F:	drivers/i2c/busses/i2c-cadence.c
>>  F:	drivers/i2c/busses/i2c-xiic.c
>>  F:	drivers/mmc/host/sdhci-of-arasan.c
>> +F:	drivers/usb/misc/usb5744.c
>>  N:	zynq
>>  N:	xilinx
>>  
>> diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
>> index 8f1144359012..30335b5c4f88 100644
>> --- a/drivers/usb/misc/Kconfig
>> +++ b/drivers/usb/misc/Kconfig
>> @@ -242,6 +242,15 @@ config USB_HUB_USB251XB
>>  	  parameters may be set in devicetree or platform data.
>>  	  Say Y or M here if you need to configure such a device via SMBus.
>>  
>> +config USB_USB5744
>> +	tristate "Microchip USB5744 Hub driver"
>> +	depends on I2C
>> +	depends on GPIOLIB
>> +	help
>> +	  This option enables support for Microchip USB5744 Hub. This driver
>> +	  optionally reset the hub using gpio pin and configure hub via i2c if
>> +	  connected.
>> +
>>  config USB_HSIC_USB3503
>>  	tristate "USB3503 HSIC to USB20 Driver"
>>  	depends on I2C
>> diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
>> index 5f4e598573ab..5920146a506a 100644
>> --- a/drivers/usb/misc/Makefile
>> +++ b/drivers/usb/misc/Makefile
>> @@ -25,6 +25,7 @@ obj-$(CONFIG_USB_USS720)		+= uss720.o
>>  obj-$(CONFIG_USB_SEVSEG)		+= usbsevseg.o
>>  obj-$(CONFIG_USB_YUREX)			+= yurex.o
>>  obj-$(CONFIG_USB_HUB_USB251XB)		+= usb251xb.o
>> +obj-$(CONFIG_USB_USB5744)		+= usb5744.o
> 
> Can you follow the convention of the config options we have already, and
> make this USB_HUB_USB5744 please?

Sure.

> 
>>  obj-$(CONFIG_USB_HSIC_USB3503)		+= usb3503.o
>>  obj-$(CONFIG_USB_HSIC_USB4604)		+= usb4604.o
> 
> And then put it in sorted order :)

Do you want me to sort the whole Makefile and Kconfig as separate patch?
It is pretty much unsorted now.

And any other problem with the driver itself?

Thanks,
Michal