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From:   Chanwoo Choi <cwchoi00@gmail.com>
Date:   Thu, 25 Jul 2019 23:23:44 +0900
Message-ID: <CAGTfZH2UzvOVE-hKHLLGa7-ZF6DqsXvZiHcMy4O9qpohYLGbDA@mail.gmail.com>
Subject: Re: [RFCv3 1/3] dt-bindings: devfreq: Add initial bindings for i.MX
To:     Leonard Crestez <leonard.crestez@nxp.com>
Cc:     MyungJoo Ham <myungjoo.ham@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Will Deacon <will@kernel.org>, Stephen Boyd <sboyd@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Jacky Bai <ping.bai@nxp.com>,
        Anson Huang <Anson.Huang@nxp.com>,
        Abel Vesa <abel.vesa@nxp.com>,
        Dong Aisheng <aisheng.dong@nxp.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Georgi Djakov <georgi.djakov@linaro.org>,
        Alexandre Bailon <abailon@baylibre.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Frank Li <Frank.li@nxp.com>, Rob Herring <robh+dt@kernel.org>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Linux PM list <linux-pm@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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Hi,

2019=EB=85=84 7=EC=9B=94 24=EC=9D=BC (=EC=88=98) =EC=98=A4=ED=9B=84 10:36, =
Leonard Crestez <leonard.crestez@nxp.com>=EB=8B=98=EC=9D=B4 =EC=9E=91=EC=84=
=B1:
>
> Add initial dt bindings for the interconnects inside i.MX chips.
> Multiple external IPs are involved but SOC integration means the
> software controllable interfaces are very similar.
>
> This is initially only for imx8mm but add an "fsl,imx-bus" fallback
> similar to exynos-bus.
>
> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
> ---
>  .../devicetree/bindings/devfreq/imx.yaml      | 59 +++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/devfreq/imx.yaml
>
> diff --git a/Documentation/devicetree/bindings/devfreq/imx.yaml b/Documen=
tation/devicetree/bindings/devfreq/imx.yaml
> new file mode 100644
> index 000000000000..87f90cddfd29
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/devfreq/imx.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/devfreq/imx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic i.MX bus frequency device
> +
> +maintainers:
> +  - Leonard Crestez <leonard.crestez@nxp.com>
> +
> +description: |
> +  The i.MX SoC family has multiple buses for which clock frequency (and =
sometimes
> +  voltage) can be adjusted.
> +
> +  Some of those buses expose register areas mentioned in the memory maps=
 as GPV
> +  ("Global Programmers View") but not all. Access to this area might be =
denied for
> +  normal world.
> +
> +  The buses are based on externally licensed IPs such as ARM NIC-301 and=
 Arteris
> +  FlexNOC but DT bindings are specific to the integration of these bus
> +  interconnect IPs into imx SOCs.
> +
> +properties:
> +  reg:
> +    maxItems: 1
> +    description: GPV area
> +
> +  compatible:
> +    contains:
> +      enum:
> +       - fsl,imx8m-noc
> +       - fsl,imx8m-nic
> +       - fsl,imx8m-ddrc
> +
> +  clocks:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - clocks
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mm-clock.h>
> +    ddrc: dram-controller@3d400000 {
> +            compatible =3D "fsl,imx8mm-ddrc";

s/imx8mm/imx8m

> +            reg =3D <0x3d400000 0x400000>;
> +            clocks =3D <&clk IMX8MM_CLK_DRAM>;
> +            operating-points-v2 =3D <&ddrc_opp_table>;
> +    };
> +
> +  - |
> +    noc: noc@32700000 {
> +            compatible =3D "fsl,imx8mm-noc";

s/imx8mm/imx8m

> +            reg =3D <0x32700000 0x100000>;
> +            clocks =3D <&clk IMX8MM_CLK_NOC>;
> +            operating-points-v2 =3D <&noc_opp_table>;
> +    };
> --
> 2.17.1
>


--=20
Best Regards,
Chanwoo Choi