linux-kernel - Re: [PATCH v2 0/6] ARM: davinci: ohci-da8xx: model the vbus GPIO as a fixed regulator

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Date:   Fri, 29 Mar 2019 10:02:41 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Bartosz Golaszewski <brgl@...ev.pl>
cc:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 0/6] ARM: davinci: ohci-da8xx: model the vbus GPIO as
 a fixed regulator

On Fri, 29 Mar 2019, Bartosz Golaszewski wrote:

> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> Historically the power supply management in this driver has been handled
> in two separate places in parallel. Device-tree users simply defined an
> appropriate regulator, while two boards with no DT support (da830-evm and
> omapl138-hawk) passed functions defined in their respective board files
> over platform data. These functions simply used legacy GPIO calls to
> watch the oc GPIO for interrupts and disable the vbus GPIO when the irq
> fires.
> 
> Commit d193abf1c913 ("usb: ohci-da8xx: add vbus and overcurrent gpios")
> updated these GPIO calls to the modern API and moved them inside the
> driver.
> 
> This however is not the optimal solution for the vbus GPIO as it
> duplicates code. Instead we should model the GPIO as a fixed regulator
> that can be controlled with a GPIO.
> 
> This series adds fixed regulators for all users of vbus GPIO, adds
> overcurrent protection using the existing vbus regulator in the USB
> driver and removes the vbus GPIO calls once they're no longer used.
> 
> v1 -> v2:
> - add patch 1/6 that fixes an existing problem with missing array
>   sentinels in GPIO lookups
> - add patch 2/6 that removes an unnecessary use count variable from the
>   driver
> - reorder the changes: add support for overcurrent protection using the
>   existing vbus regulator first, then setup fixed regulators in board
>   files and finally remove the vbus GPIO from the ohci driver
> 
> Bartosz Golaszewski (6):
>   ARM: davinci: add missing sentinels to GPIO lookup tables
>   usb: ohci-da8xx: let the regulator framework keep track of use count
>   usb: ohci-da8xx: disable the regulator if the overcurrent irq fired
>   ARM: davinci: omapl138-hawk: add a fixed regulator for ohci-da8xx
>   ARM: davinci: da830-evm: add a fixed regulator for ohci-da8xx
>   usb: ohci-da8xx: drop the vbus GPIO
> 
>  arch/arm/mach-davinci/board-da830-evm.c     | 51 ++++++++++++++++++--
>  arch/arm/mach-davinci/board-da850-evm.c     |  1 +
>  arch/arm/mach-davinci/board-dm355-evm.c     |  1 +
>  arch/arm/mach-davinci/board-dm644x-evm.c    |  1 +
>  arch/arm/mach-davinci/board-omapl138-hawk.c | 50 ++++++++++++++++++--
>  drivers/usb/host/ohci-da8xx.c               | 52 ++++++++++-----------
>  6 files changed, 122 insertions(+), 34 deletions(-)

For patches 2, 3, and 6:

Acked-by: Alan Stern <stern@...land.harvard.edu>

Alan Stern