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

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Message-Id: <20190329093334.3885-1-brgl@bgdev.pl>
Date:   Fri, 29 Mar 2019 10:33:28 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v2 0/6] ARM: davinci: ohci-da8xx: model the vbus GPIO as a fixed regulator

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(-)

-- 
2.21.0