linux-kernel - [PATCH V2 0/3] gpio: modepin: Add driver support for modepin GPIO controller

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Date:   Thu, 5 Aug 2021 23:12:16 +0530
From:   Piyush Mehta <piyush.mehta@...inx.com>
To:     <arnd@...db.de>, <zou_wei@...wei.com>,
        <gregkh@...uxfoundation.org>, <linus.walleij@...aro.org>,
        <michal.simek@...inx.com>, <wendy.liang@...inx.com>,
        <iwamatsu@...auri.org>, <bgolaszewski@...libre.com>,
        <robh+dt@...nel.org>, <rajan.vaja@...inx.com>
CC:     <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <git@...inx.com>, <sgoud@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Piyush Mehta <piyush.mehta@...inx.com>
Subject: [PATCH V2 0/3] gpio: modepin: Add driver support for modepin GPIO controller

This patch adds support for the zynqmp modepin GPIO controller and
documented for the same. GPIO modepin driver set and get the value and
status of the PS_MODE pin, based on device-tree pin configuration.
These four-bits boot-mode pins are dedicated configurable as input/output.
After the stabilization of the system,these mode pins are sampled.

To access GPIO pins, added Xilinx ZynqMP firmware MDIO API support to
set and get PS_MODE pins value and status. These APIs are interface
APIs, between the mode pin controller driver and low-level API.

---
Changes in v2:
- Added Xilinx ZynqMP firmware MMIO API support to set and get pin
  value and status.
- DT Documentation- Addressed review comments: Update commit message
- Modepin driver- Addressed review comments:
  - Update APIs
  - Removed unwanted variables
  - Handle return path for probe function

Review Comments:
https://lore.kernel.org/linux-arm-kernel/20210624205055.GA1961487@robh.at.kernel.org/T/#u
---

Piyush Mehta (3):
  firmware: zynqmp: Add MMIO read and write support for PS_MODE pin
  dt-bindings: gpio: zynqmp: Add binding documentation for modepin
  gpio: modepin: Add driver support for modepin GPIO controller

 .../bindings/gpio/xlnx,zynqmp-gpio-modepin.yaml    |  41 ++++++
 drivers/firmware/xilinx/zynqmp.c                   |  46 ++++++
 drivers/gpio/Kconfig                               |  12 ++
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-zynqmp-modepin.c                 | 158 +++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h               |  14 ++
 6 files changed, 272 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/xlnx,zynqmp-gpio-modepin.yaml
 create mode 100644 drivers/gpio/gpio-zynqmp-modepin.c

-- 
2.7.4