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

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Message-ID: <YCJd5Xoy1cT6bCIB@kroah.com>
Date:   Tue, 9 Feb 2021 11:03:17 +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 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?

>  obj-$(CONFIG_USB_HSIC_USB3503)		+= usb3503.o
>  obj-$(CONFIG_USB_HSIC_USB4604)		+= usb4604.o

And then put it in sorted order :)

thanks,

greg k-h