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Tue, 16 Nov 2021 14:43:14 +0000 From: "Miclaus, Antoniu" To: Jonathan Cameron CC: "robh+dt@kernel.org" , "linux-iio@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH 3/4] dt-bindings:iio:filter: add admv8818 doc Thread-Topic: [PATCH 3/4] dt-bindings:iio:filter: add admv8818 doc Thread-Index: AQHX1WXROa8gBfces0OdmTnnZfx+/6wAL4SAgAYQw/A= Date: Tue, 16 Nov 2021 14:43:14 +0000 Message-ID: References: <20211109123127.96399-1-antoniu.miclaus@analog.com> <20211109123127.96399-4-antoniu.miclaus@analog.com> <20211112174601.3c1f6b4b@jic23-huawei> In-Reply-To: <20211112174601.3c1f6b4b@jic23-huawei> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-dg-ref: =?iso-8859-2?Q?PG1ldGE+PGF0IG5tPSJib2R5LnR4dCIgcD0iYzpcdXNlcnNcYW1pY2xhdX?= =?iso-8859-2?Q?NcYXBwZGF0YVxyb2FtaW5nXDA5ZDg0OWI2LTMyZDMtNGE0MC04NWVlLTZi?= =?iso-8859-2?Q?ODRiYTI5ZTM1Ylxtc2dzXG1zZy04NTI0ZDc5MS00NmViLTExZWMtYWJlZi?= =?iso-8859-2?Q?1kNDgxZDc1MDZkZGVcYW1lLXRlc3RcODUyNGQ3OTItNDZlYi0xMWVjLWFi?= =?iso-8859-2?Q?ZWYtZDQ4MWQ3NTA2ZGRlYm9keS50eHQiIHN6PSI0NjY1IiB0PSIxMzI4MT?= =?iso-8859-2?Q?U0NzM5MTk2MTg3MzciIGg9Im5UbU5CQUZHdDlKZDdxVTZEditGbURqR0kz?= =?iso-8859-2?Q?WT0iIGlkPSIiIGJsPSIwIiBibz0iMSIgY2k9ImNBQUFBRVJIVTFSU1JVRk?= =?iso-8859-2?Q?5DZ1VBQUVvQ0FBQ3hicWRIK05yWEFZRGpuR0xpbzMwL2dPT2NZdUtqZlQ4?= =?iso-8859-2?Q?REFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFIQUFBQURhQVFBQUFBQUFBQU?= =?iso-8859-2?Q?FBQUFBQUFBQUFBQUFBQUFFQUFRQUJBQUFBWFEvampRQUFBQUFBQUFBQUFB?= =?iso-8859-2?Q?QUFBSjRBQUFCaEFHUUFhUUJmQUhNQVpRQmpBSFVBY2dCbEFGOEFjQUJ5QU?= =?iso-8859-2?Q?c4QWFnQmxBR01BZEFCekFGOEFaZ0JoQUd3QWN3QmxBRjhBWmdCdkFITUFh?= =?iso-8859-2?Q?UUIwQUdrQWRnQmxBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQU?= =?iso-8859-2?Q?FBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?iso-8859-2?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUVBQUFBQUFBQUFBZ0FBQUFBQW5nQU?= =?iso-8859-2?Q?FBR0VBWkFCcEFGOEFjd0JsQUdNQWRRQnlBR1VBWHdCd0FISUFid0JxQUdV?= =?iso-8859-2?Q?QVl3QjBBSE1BWHdCMEFHa0FaUUJ5QURFQUFBQUFBQUFBQUFBQUFBQUFBQU?= =?iso-8859-2?Q?FBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?iso-8859-2?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQU?= =?iso-8859-2?Q?FBQUFBQUFBQUFBQUFBQUFRQUFBQUFBQUFBQ0FBQUFBQUNlQUFBQVlRQmtB?= =?iso-8859-2?Q?R2tBWHdCekFHVUFZd0IxQUhJQVpRQmZBSEFBY2dCdkFHb0FaUUJqQUhRQW?= =?iso-8859-2?Q?N3QmZBSFFBYVFCbEFISUFNZ0FBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?iso-8859-2?Q?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQU?= =?iso-8859-2?Q?FBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFB?= =?iso-8859-2?Q?QUFBQUFBQUFCQUFBQUFBQUFBQUlBQUFBQUFBPT0iLz48L21ldGE+?= x-dg-rorf: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8b440263-6bd6-4075-b1fb-08d9a90f6b75 x-ms-traffictypediagnostic: CY1PR03MB2139: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; 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charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: analog.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CY4PR03MB3399.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8b440263-6bd6-4075-b1fb-08d9a90f6b75 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Nov 2021 14:43:14.1055 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: eaa689b4-8f87-40e0-9c6f-7228de4d754a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 1pZK4/bOOxr6QM9AveBQFEn6+EVhNxqfZHiZ4oHkQhlxnYS7kX3UyC6DzEV7uK9EyR6nstDBlAp9XwU6weKvuUxOZfrU1/uIUCQQUwOQLuY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR03MB2139 X-Proofpoint-GUID: CC-RWWJHY8S-x0d5f0g1_hHC0rTma3oO X-Proofpoint-ORIG-GUID: CC-RWWJHY8S-x0d5f0g1_hHC0rTma3oO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-11-16_02,2021-11-16_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 adultscore=0 impostorscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 mlxscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2111160072 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Jonathan, -- Antoniu Micl=E3u=BA > -----Original Message----- > From: Jonathan Cameron > Sent: Friday, November 12, 2021 7:46 PM > To: Miclaus, Antoniu > Cc: robh+dt@kernel.org; linux-iio@vger.kernel.org; > devicetree@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH 3/4] dt-bindings:iio:filter: add admv8818 doc >=20 > [External] >=20 > On Tue, 9 Nov 2021 14:31:26 +0200 > Antoniu Miclaus wrote: >=20 > > Add device tree bindings for the ADMV8818 Filter. > > > > Signed-off-by: Antoniu Miclaus > > --- > > .../bindings/iio/filter/adi,admv8818.yaml | 78 +++++++++++++++++++ > > 1 file changed, 78 insertions(+) > > create mode 100644 > Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml > > > > diff --git > a/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml > b/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml > > new file mode 100644 > > index 000000000000..d581e236dbdc > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/iio/filter/adi,admv8818.yaml > > @@ -0,0 +1,78 @@ > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: > https://urldefense.com/v3/__http://devicetree.org/schemas/iio/filter/adi,= a > dmv8818.yaml*__;Iw!!A3Ni8CS0y2Y!qkKokhmcgS0YEIy3uC6OfOOF7Bq3yE_r > Ny91yIkDRTXFe54x-cHq_BtsyzDOedLohB5D$ > > +$schema: https://urldefense.com/v3/__http://devicetree.org/meta- > schemas/core.yaml*__;Iw!!A3Ni8CS0y2Y!qkKokhmcgS0YEIy3uC6OfOOF7Bq3 > yE_rNy91yIkDRTXFe54x-cHq_BtsyzDOeYdHtx0a$ > > + > > +title: ADMV8818 Digitally Tunable, High-Pass and Low-Pass Filter > > + > > +maintainers: > > + - Antoniu Miclaus > > + > > +description: | > > + Fully monolithic microwave integrated circuit (MMIC) that > > + features a digitally selectable frequency of operation. > > + The device features four independently controlled high-pass > > + filters (HPFs) and four independently controlled low-pass filters > > + (LPFs) that span the 2 GHz to 18 GHz frequency range. > > + > > + https://www.analog.com/en/products/admv8818.html > > + > > +properties: > > + compatible: > > + enum: > > + - adi,admv8818 > > + > > + reg: > > + maxItems: 1 > > + > > + spi-max-frequency: > > + maximum: 10000000 > > + > > + clocks: > > + description: > > + Definition of the external clock. > > + minItems: 1 > > + > > + clock-names: > > + items: > > + - const: "rf_in" >=20 > Is this what we'd normally think of as a clock signal? I'd not expect > a nice squarewave on that pin for example so this seems an odd way to > define it. >=20 The only actual use of this part, until now, was to filter the output of th= e following part: https://www.analog.com/en/products/adf5610.html This is the reason of using the clock framework in the driver. Moreover, th= e clock input is optional inside the driver. > > + > > + clock-output-names: > > + maxItems: 1 > > + > > + adi,bw-hz: > > + description: > > + Allows the user to increase the Bandpass Filter (BPF) bandwidth > > + in Hz. Normally when invoked by the clk notifier, the driver > > + sets the HPF cutoff close below the frequency and the LPF cutoff > > + close above the frequency, and thus creating a BPF. >=20 > I don't understand this item at all. Why do we need a control to > basically change how the other filter parameters are expressed? >=20 Indeed, this property was requested by the users of the application in whic= h this part was involved. Same goes for the filter modes and the bandwidth in the ABI documentation. If you think these attributes/properties are way too custom, I can drop the= m. Let me know your thoughts. > > + $ref: /schemas/types.yaml#/definitions/uint64 > > + > > + '#clock-cells': > > + const: 0 > > + > > +required: > > + - compatible > > + - reg > > + - clocks > > + - clock-names > > + > > +additionalProperties: false > > + > > +examples: > > + - | > > + spi { > > + #address-cells =3D <1>; > > + #size-cells =3D <0>; > > + admv8818@0 { > > + compatible =3D "adi,admv8818"; > > + reg =3D <0>; > > + spi-max-frequency =3D <10000000>; > > + clocks =3D <&admv8818_rfin>; > > + clock-names =3D "rf_in"; > > + adi,bw-hz =3D /bits/ 64 <600000000>; > > + }; > > + }; > > +... > > +