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

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Date:   Tue, 28 Feb 2017 15:38:27 +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@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] reset: Add i.MX7 SRC reset driver

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.

regards
Philipp