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

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Date:   Tue, 9 Feb 2021 11:40:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     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 Tue, Feb 09, 2021 at 11:11:54AM +0100, Michal Simek wrote:
> 
> 
> 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?

No, but at least put your new line in the obvious place, in order :)

> And any other problem with the driver itself?

No idea, I stopped here in reviewing...

thanks,

greg k-h