linux-kernel - [PATCH v4 0/6] ARM: davinci: ohci-da8xx: model the vbus GPIO as a fixed regulator

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Message-Id: <20190411093024.23555-1-brgl@bgdev.pl>
Date:   Thu, 11 Apr 2019 11:30:18 +0200
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 v4 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.

Tested on da830-evm with the module both built-in and loadable.

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

v2 -> v3:
- change the device id of the fixed regulator to 0 since it's the first
  one
- drop the interrupt-context handler and only use the thread
- drop Alan's Ack from patch 3/6 as it's changed significantly
- rebase on top of v5.1-rc4

v3 -> v4:
- in patch 2/6: switch to using a simple if/else

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               | 46 ++++++++-----------
 6 files changed, 116 insertions(+), 34 deletions(-)

-- 
2.21.0