linux-kernel - [PATCH v6 0/9] ASPEED sgpio driver enhancement.

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Message-ID: <20210712100317.23298-1-steven_lee@aspeedtech.com>
Date:   Mon, 12 Jul 2021 18:03:07 +0800
From:   Steven Lee <steven_lee@...eedtech.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>
CC:     <steven_lee@...eedtech.com>, <Hongweiz@....com>,
        <ryan_chen@...eedtech.com>, <billy_tsai@...eedtech.com>
Subject: [PATCH v6 0/9] ASPEED sgpio driver enhancement.

AST2600 SoC has 2 SGPIO master interfaces one with 128 pins another one
with 80 pins, AST2500/AST2400 SoC has 1 SGPIO master interface that
supports up to 80 pins.
In the current driver design, the max number of sgpio pins is hardcoded
in macro MAX_NR_HW_SGPIO and the value is 80.

For supporting sgpio master interfaces of AST2600 SoC, the patch series
contains the following enhancement:
- Convert txt dt-bindings to yaml.
- Update aspeed-g6 dtsi to support the enhanced sgpio.
- Support muiltiple SGPIO master interfaces.
- Support up to 128 pins by dts ngpios property.
- Pair input/output GPIOs instead of using 0 as GPIO input pin base and
  MAX_NR_HW_SGPIO as GPIO output pin base.
- Support wdt reset tolerance.
- Fix irq_chip issues which causes multiple sgpio devices use the same
  irq_chip data.
- Replace all of_*() APIs with device_*().

Changes from v5:
* Squash v5 patch-05 and patch-06 to one patch.
* Remove MAX_NR_HW_SGPIO and corresponding design to make the gpio
  input/output pin base are determined by ngpios.
  For example, if MAX_NR_HW_SGPIO is 80 and ngpios is 10, the original
  pin order is as follows:
    Input:
    0 1 2 3 ... 9
    Output:
    80 81 82 ... 89

  With the new design, pin order is changed as follows:
    Input:
    0 2 4 6 ... 18(ngpios * 2 - 2)
    Output:
    1 3 5 7 ... 19(ngpios * 2 - 1)
* Replace ast2600-sgpiom-128 and ast2600-sgpiom-80 compatibles by
  ast2600-sgpiom.
* Fix coding style issues.

Changes from v4:
* Remove ngpios from dtsi
* Add ast2400 and ast2500 platform data.
* Remove unused macros.
* Add ngpios check in a separate patch.
* Fix coding style issues.

Changes from v3:
* Split dt-bindings patch to 2 patches
* Rename ast2600-sgpiom1 compatible with ast2600-sgiom-128
* Rename ast2600-sgpiom2 compatible with ast2600-sgiom-80
* Correct the typo in commit messages.
* Fix coding style issues.
* Replace all of_*() APIs with device_*().

Changes from v2:
* Remove maximum/minimum of ngpios from bindings.
* Remove max-ngpios from bindings and dtsi.
* Remove ast2400-sgpiom and ast2500-sgpiom compatibles from dts and
  driver.
* Add ast2600-sgpiom1 and ast2600-sgpiom2 compatibles as their max
  number of available gpio pins are different.
* Modify functions to pass aspeed_sgpio struct instead of passing
  max_ngpios.
* Split sgpio driver patch to 3 patches

Changes from v1:
* Fix yaml format issues.
* Fix issues reported by kernel test robot.

Please help to review.

Thanks,
Steven

Steven Lee (9):
  dt-bindings: aspeed-sgpio: Convert txt bindings to yaml.
  dt-bindings: aspeed-sgpio: Add ast2600 sgpio
  ARM: dts: aspeed-g6: Add SGPIO node.
  ARM: dts: aspeed-g5: Remove ngpios from sgpio node.
  gpio: gpio-aspeed-sgpio: Add AST2600 sgpio support
  gpio: gpio-aspeed-sgpio: Add set_config function
  gpio: gpio-aspeed-sgpio: Move irq_chip to aspeed-sgpio struct
  gpio: gpio-aspeed-sgpio: Use generic device property APIs
  gpio: gpio-aspeed-sgpio: Return error if ngpios is not multiple of 8.

 .../bindings/gpio/aspeed,sgpio.yaml           |  77 ++++++++
 .../devicetree/bindings/gpio/sgpio-aspeed.txt |  46 -----
 arch/arm/boot/dts/aspeed-g5.dtsi              |   1 -
 arch/arm/boot/dts/aspeed-g6.dtsi              |  28 +++
 drivers/gpio/gpio-aspeed-sgpio.c              | 178 +++++++++++-------
 5 files changed, 215 insertions(+), 115 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/gpio/aspeed,sgpio.yaml
 delete mode 100644 Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt

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2.17.1