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From: Biju Das <biju.das.jz@bp.renesas.com>
To: Alexander Helms <alexander.helms.jy@renesas.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
	"linux-renesas-soc@vger.kernel.org" 
	<linux-renesas-soc@vger.kernel.org>
Cc: "robh+dt@kernel.org" <robh+dt@kernel.org>,
	"sboyd@kernel.org" <sboyd@kernel.org>,
	"mturquette@baylibre.com" <mturquette@baylibre.com>,
	"geert+renesas@glider.be" <geert+renesas@glider.be>,
	Alexander Helms <alexander.helms.jy@renesas.com>,
	David Cater <david.cater.jc@renesas.com>,
	"michal.simek@xilinx.com" <michal.simek@xilinx.com>
Subject: RE: [PATCH v2 1/2] dt-bindings: Add binding for Renesas 8T49N241
Date: Fri, 2 Jul 2021 06:52:11 +0000	[thread overview]
Message-ID: <OS0PR01MB592240DACD7D18609EA70AE0861F9@OS0PR01MB5922.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20210701232258.19146-2-alexander.helms.jy@renesas.com>

Hi Alex,

Thanks for the patch.

> -----Original Message-----
> From: Alex Helms <alexander.helms.jy@renesas.com>
> Sent: 02 July 2021 00:23
> To: linux-kernel@vger.kernel.org; devicetree@vger.kernel.org; linux-
> clk@vger.kernel.org; linux-renesas-soc@vger.kernel.org
> Cc: robh+dt@kernel.org; sboyd@kernel.org; mturquette@baylibre.com;
> geert+renesas@glider.be; Alexander Helms <alexander.helms.jy@renesas.com>;
> David Cater <david.cater.jc@renesas.com>; michal.simek@xilinx.com
> Subject: [PATCH v2 1/2] dt-bindings: Add binding for Renesas 8T49N241
> 
> Renesas 8T49N241 has 4 outputs, 1 integral and 3 fractional dividers.
> The 8T49N241 accepts up to two differential or single-ended input clocks
> and a fundamental-mode crystal input. The internal PLL can lock to either
> of the input reference clocks or to the crystal to behave as a frequency
> synthesizer.
> 
> Signed-off-by: Alex Helms <alexander.helms.jy@renesas.com>
> ---
>  .../bindings/clock/renesas,8t49n241.yaml      | 183 ++++++++++++++++++
>  MAINTAINERS                                   |   6 +
>  2 files changed, 189 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/clock/renesas,8t49n241.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/renesas,8t49n241.yaml
> b/Documentation/devicetree/bindings/clock/renesas,8t49n241.yaml
> new file mode 100644
> index 000000000..d817ec46d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/renesas,8t49n241.yaml
> @@ -0,0 +1,183 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
> +---
> +$id:
> +https://jpn01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevice
> +tree.org%2Fschemas%2Fclock%2Frenesas%2C8t49n24x.yaml%23&amp;data=04%7C0
> +1%7Cbiju.das.jz%40bp.renesas.com%7Ce51e24d06083403a3d0e08d93ce73933%7C5
> +3d82571da1947e49cb4625a166a4a2a%7C0%7C0%7C637607786063741484%7CUnknown%
> +7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXV
> +CI6Mn0%3D%7C1000&amp;sdata=BIKHeHpyG3vloEEO02HzM6TtWqQtDlSGRMifOQVprPI%
> +3D&amp;reserved=0
> +$schema:
> +https://jpn01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevice
> +tree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=04%7C01%7Cbiju.das.jz%4
> +0bp.renesas.com%7Ce51e24d06083403a3d0e08d93ce73933%7C53d82571da1947e49c
> +b4625a166a4a2a%7C0%7C0%7C637607786063751443%7CUnknown%7CTWFpbGZsb3d8eyJ
> +WIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&
> +amp;sdata=3XhlKhlwT3hr0KVjynaiMlqMC94tq3sEYgNH6LMf9Kc%3D&amp;reserved=0
> +
> +title: Binding for Renesas 8T49N241 Universal Frequency Translator
> +
> +description: |
> +  The 8T49N241 has one fractional-feedback PLL that can be used as a
> +  jitter attenuator and frequency translator. It is equipped with one
> +  integer and three fractional output dividers, allowing the generation
> +  of up to four different output frequencies, ranging from 8kHz to 1GHz.
> +  These frequencies are completely independent of each other, the input
> +  reference frequencies and the crystal reference frequency. The device
> +  places virtually no constraints on input to output frequency
> +conversion,
> +  supporting all FEC rates, including the new revision of ITU-T
> +  Recommendation G.709 (2009), most with 0ppm conversion error.
> +  The outputs may select among LVPECL, LVDS, HCSL or LVCMOS output
> levels.
> +
> +  The driver can read a full register map from the DT, and will use
> + that  register map to initialize the attached part (via I2C) when the
> + system  boots. Any configuration not supported by the common clock
> + framework  must be done via the full register map, including optimized
> settings.
> +
> +  The 8T49N241 accepts up to two differential or single-ended input
> + clocks  and a fundamental-mode crystal input. The internal PLL can
> + lock to either  of the input reference clocks or just to the crystal
> + to behave as a  frequency synthesizer. The PLL can use the second
> + input for redundant  backup of the primary input reference, but in
> + this case, both input clock  references must be related in frequency.
> +
> +  All outputs are currently assumed to be LVDS, unless overridden in
> + the  full register map in the DT.
> +
> +maintainers:
> +  - Alex Helms <alexander.helms.jy@renesas.com>
> +  - David Cater <david.cater.jc@renesas.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - 8t49n241
> +
> +  reg:
> +    description: I2C device address
> +    enum: [ 0x7c, 0x6c, 0x7d, 0x6d, 0x7e, 0x6e, 0x7f, 0x6f ]
> +
> +  '#clock-cells':
> +    const: 1
> +
> +  clock-names:
> +    description: Name of the input clock
> +    minItems: 1
> +    maxItems: 3
> +    items:
> +      enum: [ input-xtal, input-clk0, input-clk1 ]
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 3
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#clock-cells'
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    /* 25MHz reference clock */
> +    input_clk0: input_clk0 {
> +      compatible = "fixed-clock";
> +      #clock-cells = <0>;
> +      clock-frequency = <25000000>;
> +    };
> +
> +    i2c@0 {
> +        reg = <0x0 0x100>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        renesas8t49n241_1: clock-generator@6c {
> +            compatible = "renesas,8t49n241";
> +            reg = <0x6c>;
> +            #clock-cells = <1>;
> +
> +            clocks = <&input_clk0>;
> +            clock-names = "input-clk0";
> +        };
> +    };
> +
> +    /* Consumer referencing the 8T49N241 Q1 */
> +    consumer {
> +        /* ... */
> +        clocks = <&renesas8t49n241_1 1>;
> +        /* ... */
> +    };
> +  - |
> +    /* 40MHz crystal */
> +    input_xtal: input_xtal {
> +      compatible = "fixed-clock";
> +      #clock-cells = <0>;
> +      clock-frequency = <40000000>;
> +    };
> +
> +    i2c@0 {
> +        reg = <0x0 0x100>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        renesas8t49n241_2: clock-generator@6c {
> +            compatible = "renesas,8t49n241";
> +            reg = <0x6c>;
> +            #clock-cells = <1>;
> +
> +            clocks = <&input_xtal>;
> +            clock-names = "input-xtal";
> +
> +            settings=[

optional or required property?

> +                09 50 00 60 67 C5 6C FF 03 00 30 00 00 01 00 00
> +                01 07 00 00 07 00 00 77 6D 06 00 00 00 00 00 FF
> +                FF FF FF 00 3F 00 2A 00 16 33 33 00 01 00 00 D0
> +                00 00 00 00 00 00 00 00 00 04 00 00 00 02 00 00
> +                00 00 00 00 00 00 00 17 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 D7 0A 2B 20 00 00 00 0B
> +                00 00 00 00 00 00 00 00 00 00 27 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                C3 00 08 01 00 00 00 00 00 00 00 00 00 30 00 00
> +                00 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> +                00 00 00 00 85 00 00 9C 01 D4 02 71 07 00 00 00
> +                00 83 00 10 02 08 8C
> +            ];
> +        };
> +    };
> +

One question, 
Full regmap or just overriding few registers which is better, assuming the device has default values programmed in OTP.
Again that needs {offset, value}???

Regards,
Biju

 
> +    /* Consumer referencing the 8T49N241 Q1 */
> +    consumer {
> +        /* ... */
> +        clocks = <&renesas8t49n241_2 1>;
> +        /* ... */
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0cce91cd5..882d79ead 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15575,6 +15575,12 @@ F:	include/linux/rpmsg/
>  F:	include/uapi/linux/rpmsg.h
>  F:	samples/rpmsg/
> 
> +RENESAS 8T49N24X DRIVER
> +M:	Alex Helms <alexander.helms.jy@renesas.com>
> +M:	David Cater <david.cater.jc@renesas.com>
> +S:	Odd Fixes
> +F:	Documentation/devicetree/bindings/clock/renesas,8t49n241.yaml
> +
>  RENESAS CLOCK DRIVERS
>  M:	Geert Uytterhoeven <geert+renesas@glider.be>
>  L:	linux-renesas-soc@vger.kernel.org
> --
> 2.30.2


  reply	other threads:[~2021-07-02  6:52 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-01 19:41 [PATCH 0/2] Renesas 8T49N241 device driver Alex Helms
2021-07-01 19:41 ` [PATCH 1/2] dt-bindings: Add binding for Renesas 8T49N241 Alex Helms
2021-07-01 19:41 ` [PATCH 2/2] clk: Add ccf driver " Alex Helms
2021-07-01 22:21   ` kernel test robot
2021-07-01 23:22     ` [PATCH v2 0/2] Renesas 8T49N241 device driver Alex Helms
2021-07-01 23:22       ` [PATCH v2 1/2] dt-bindings: Add binding for Renesas 8T49N241 Alex Helms
2021-07-02  6:52         ` Biju Das [this message]
2021-07-02 21:51           ` Alexander Helms
2021-07-03 10:15             ` Biju Das
2021-07-02 13:28         ` Rob Herring
2021-07-01 23:22       ` [PATCH v2 2/2] clk: Add ccf driver " Alex Helms
2021-07-02  0:57       ` [PATCH v2 0/2] Renesas 8T49N241 device driver Stephen Boyd

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