linux-kernel - Re: [PATCH 0/3] ADF41513/ADF41510 PLL frequency synthesizers

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Message-ID: <20251116161023.7a4b1b6e@jic23-huawei>
Date: Sun, 16 Nov 2025 16:10:23 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Rodrigo Alencar via B4 Relay
 <devnull+rodrigo.alencar.analog.com@...nel.org>
Cc: rodrigo.alencar@...log.com, linux-kernel@...r.kernel.org,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-doc@...r.kernel.org, David Lechner <dlechner@...libre.com>, Andy
 Shevchenko <andy@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, Michael
 Hennerich <Michael.Hennerich@...log.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 0/3] ADF41513/ADF41510 PLL frequency synthesizers

On Mon, 10 Nov 2025 15:44:43 +0000
Rodrigo Alencar via B4 Relay <devnull+rodrigo.alencar.analog.com@...nel.org> wrote:

> This patch series adds support for the Analog Devices ADF41513 and ADF41510
> ultralow noise PLL frequency synthesizers. These devices are designed for
> implementing local oscillators (LOs) in high-frequency applications.
> 
> The ADF41513 covers frequencies from 1 GHz to 26.5 GHz, while the ADF41510
> operates from 1 GHz to 10 GHz. Both devices feature exceptional phase noise
> performance and flexible frequency synthesis capabilities.
> 
> Key features supported by this driver:
> - Integer-N and fractional-N operation modes
> - Ultra-low phase noise (-235 dBc/Hz integer-N, -231 dBc/Hz fractional-N)
> - High maximum PFD frequency (250 MHz integer-N, 125 MHz fractional-N)
> - 25-bit fixed modulus or 49-bit variable modulus fractional modes
> - Programmable charge pump currents with 16x range
> - Digital lock detect functionality
> - Phase resync capability for consistent output phase
> - Clock framework integration for system clock generation
> 
> The series includes:
> 1. Core driver implementation with full register programming support
> 2. Device tree bindings documentation
> 3. IIO subsystem documentation with usage examples
> 
> The driver integrates with both the IIO subsystem (for direct hardware control)
> and the Linux clock framework (for use as a system clock source), providing
> flexibility for different use cases.

For v2, provide a little more info on why we need both interface types
specifically what you can do with IIO that you can't do with a clock
driver.  Also +CC the clk driver folk and list from MAINTAINERS.

We have evolved to this dual interface state drivers, but I'm not sure
we aren't in a case 'If we were doing this again we'd never start from
here.'

Jonathan


> 
> Signed-off-by: Rodrigo Alencar <rodrigo.alencar@...log.com>
> ---
> Rodrigo Alencar (3):
>       iio: frequency: adf41513: driver implementation
>       dt-bindings: iio: frequency: add adf41513
>       docs: iio: add documentation for adf41513 driver
> 
>  .../bindings/iio/frequency/adi,adf41513.yaml       |  268 ++++
>  Documentation/iio/adf41513.rst                     |  377 +++++
>  Documentation/iio/index.rst                        |    1 +
>  MAINTAINERS                                        |    9 +
>  drivers/iio/frequency/Kconfig                      |   11 +
>  drivers/iio/frequency/Makefile                     |    1 +
>  drivers/iio/frequency/adf41513.c                   | 1435 ++++++++++++++++++++
>  7 files changed, 2102 insertions(+)
> ---
> base-commit: d16d1c2553248f9b859b86c94344d8b81f0297cd
> change-id: 20251110-adf41513-iio-driver-aaca8a7f808e
> 
> Best regards,