linux-kernel - [PATCH v2 0/3] Add new binding regulator-fixed-clock to regulator-fixed

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Date:   Tue, 10 Sep 2019 06:21:13 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Liam Girdwood <lgirdwood@...il.com>
CC:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        Rob Herring <robh+dt@...nel.org>,
        Stefan Agner <stefan.agner@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Mark Rutland <mark.rutland@....com>,
        Luka Pivk <luka.pivk@...adex.com>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>
Subject: [PATCH v2 0/3] Add new binding regulator-fixed-clock to
 regulator-fixed

Our hardware has a FET that is switching power rail of the ethernet PHY
on and off. This switching enable signal is a clock from the SoC.

There is no possibility in regulator subsystem to have this hardware
reflected in software.

I already discussed with Mark Brown about possible solutions and he
suggested to create at least a new compatible. [1]
This discussion includes also a better explanation of our circuit as
well as schematics. So please refer to that link if you have questions
about that.

In this first attempt I created a new binding "regulator-fixed-clock"
that can take a clock from devicetree. This is a simple addition to
regulator-fixed. If the binding regulator-fixed-clock is given, the
clock is simply enabled on regulator enable and disabled on regulator
disable.
To be able to have multiple consumers a counter variable is also given
that tells how many consumers need power from this regulator.

Best regards,
Philippe

[1] https://lkml.org/lkml/2019/8/7/78

Changes in v2:
- return priv->clk_enable_counter > 0 directly.
- Change select: to if:
- Change items: to enum:
- Defined how many clocks should be given

Philippe Schenker (3):
  regulator: fixed: add possibility to enable by clock
  ARM: dts: imx6ull-colibri: add phy-supply and respective regulator
  dt-bindings: regulator: add regulator-fixed-clock binding

 .../bindings/regulator/fixed-regulator.yaml   | 19 ++++-
 arch/arm/boot/dts/imx6ull-colibri.dtsi        | 12 +++
 drivers/regulator/fixed.c                     | 83 ++++++++++++++++++-
 3 files changed, 110 insertions(+), 4 deletions(-)

-- 
2.23.0