linux-kernel - Re: [PATCH v4] reset: Add i.MX7 SRC reset driver

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Message-ID: <1488358425.2310.0.camel@pengutronix.de>
Date:   Wed, 01 Mar 2017 09:53:45 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] reset: Add i.MX7 SRC reset driver

On Tue, 2017-02-28 at 11:46 -0800, Andrey Smirnov wrote:
> On Tue, Feb 28, 2017 at 6:38 AM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> > On Tue, 2017-02-21 at 08:13 -0800, Andrey Smirnov wrote:
> >> Add reset controller driver exposing various reset faculties,
> >> implemented by System Reset Controller IP block.
> >>
> >> Cc: Lucas Stach <l.stach@...gutronix.de>
> >> Cc: Rob Herring <robh+dt@...nel.org>
> >> Cc: Mark Rutland <mark.rutland@....com>
> >> Cc: devicetree@...r.kernel.org
> >> Cc: linux-kernel@...r.kernel.org
> >> Cc: linux-arm-kernel@...ts.infradead.org
> >> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> >> ---
> >>
> >> Changes since v3 (see [v3]):
> >>
> >>       - Convert code IMX7_RESET_PCIEPHY to change G_RST and BTNRST
> >>           simultaneously to make all resets be representable as
> >>           signal->bit in signal->offset register
> >>
> >>       - Convert assert/deassert subroutines to be special cases of a
> >>           common reset subroutine
> >>
> >> Changes since v2 (see [v2]):
> >>
> >>       - Fix typos
> >>
> >>       - Kconfig/Makefile chagnes account for alphabetical sorting of
> >>           those files
> >>
> >>       - Remove redundant includes
> >>
> >>       - Make use of regmap_attach_dev and avoid storing refernce to
> >>           struct *dev in private data
> >>
> >>       - Change code and headers to expose almost all of the reset
> >>           related bits in SRC IP block
> >>
> >> Changes since v1 (see [v1]):
> >>
> >>       - Various small DT bindings description fixes as per feedback
> >>           from Rob Herring
> >>
> >>
> >> [v1] https://lkml.org/lkml/2017/2/6/554
> >> [v2] https://lkml.org/lkml/2017/2/13/488
> >> [v3] https://lkml.org/lkml/2017/2/20/344
> >>
> >>
> >>  .../devicetree/bindings/reset/fsl,imx7-src.txt     |  47 ++++++
> >>  drivers/reset/Kconfig                              |   8 ++
> >>  drivers/reset/Makefile                             |   2 +
> >>  drivers/reset/reset-imx7.c                         | 158 +++++++++++++++++++++
> >>  include/dt-bindings/reset/imx7-reset.h             |  62 ++++++++
> >>  5 files changed, 277 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/reset/fsl,imx7-src.txt
> >>  create mode 100644 drivers/reset/reset-imx7.c
> >>  create mode 100644 include/dt-bindings/reset/imx7-reset.h
> >>
> >> diff --git a/Documentation/devicetree/bindings/reset/fsl,imx7-src.txt b/Documentation/devicetree/bindings/reset/fsl,imx7-src.txt
> >> new file mode 100644
> >> index 0000000..5e1afc3
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/reset/fsl,imx7-src.txt
> >> @@ -0,0 +1,47 @@
> >> +Freescale i.MX7 System Reset Controller
> >> +======================================
> >> +
> >> +Please also refer to reset.txt in this directory for common reset
> >> +controller binding usage.
> >> +
> >> +Required properties:
> >> +- compatible: Should be "fsl,imx7-src", "syscon"
> >> +- reg: should be register base and length as documented in the
> >> +  datasheet
> >> +- interrupts: Should contain SRC interrupt
> >> +- #reset-cells: 1, see below
> >> +
> >> +example:
> >> +
> >> +src: reset-controller@...90000 {
> >> +     compatible = "fsl,imx7d-src", "syscon";
> >> +     reg = <0x30390000 0x2000>;
> >> +     interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
> >> +     #reset-cells = <1>;
> >> +};
> >> +
> >> +
> >> +Specifying reset lines connected to IP modules
> >> +==============================================
> >> +
> >> +The system reset controller can be used to reset various set of
> >> +peripherals. Device nodes that need access to reset lines should
> >> +specify them as a reset phandle in their corresponding node as
> >> +specified in reset.txt.
> >> +
> >> +Example:
> >> +
> >> +     pcie: pcie@...00000 {
> >> +
> >> +             ...
> >> +
> >> +             resets = <&src IMX7_RESET_PCIEPHY>,
> >> +                      <&src IMX7_RESET_PCIE_CTRL_APPS_EN>;
> >> +             reset-names = "pciephy", "apps";
> >> +
> >> +             ...
> >> +        };
> >> +
> >> +
> >> +For list of all valid reset indicies see
> >> +<dt-bindings/reset/imx7-reset.h>
> >> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> >> index 172dc96..bea1800 100644
> >> --- a/drivers/reset/Kconfig
> >> +++ b/drivers/reset/Kconfig
> >> @@ -27,6 +27,14 @@ config RESET_BERLIN
> >>       help
> >>         This enables the reset controller driver for Marvell Berlin SoCs.
> >>
> >> +config RESET_IMX7
> >> +     bool "i.MX7 Reset Driver"
> >> +     depends on SOC_IMX7D || COMPILE_TEST
> >> +     select MFD_SYSCON
> >> +     default SOC_IMX7D
> >
> > Can we make this
> >
> > config RESET_IMX7
> >         bool "i.MX7 Reset Driver" if COMPILE_TEST
> >         default SOC_IMX7D
> >         select MFD_SYSCON
> >
> > instead?
> >
> > If you agree, I can fix it up while applying.
> 
> Sure, I have no problem with that change.

Ok, thank you. Applied to reset/next.

regards
Philipp