linux-kernel - Re: [RFC PATCH v8 01/10] dpll: documentation on DPLL subsystem interface

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Message-ID: <20230612154329.7bd2d52f@kernel.org>
Date:   Mon, 12 Jun 2023 15:43:29 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
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        vadim.fedorenko@...ux.dev
Subject: Re: [RFC PATCH v8 01/10] dpll: documentation on DPLL subsystem
 interface

On Fri,  9 Jun 2023 14:18:44 +0200 Arkadiusz Kubalewski wrote:
> From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
> 
> Add documentation explaining common netlink interface to configure DPLL
> devices and monitoring events. Common way to implement DPLL device in
> a driver is also covered.

> +``'pin': [{
> + {'clock-id': 282574471561216,
> +  'module-name': 'ice',
> +  'pin-dpll-caps': 4,
> +  'pin-id': 13,
> +  'pin-parent': [{'pin-id': 2, 'pin-state': 'connected'},
> +                 {'pin-id': 3, 'pin-state': 'disconnected'},
> +                 {'id': 0, 'pin-direction': 'input'},
> +                 {'id': 1, 'pin-direction': 'input'}],
> +  'pin-type': 'synce-eth-port'}
> +}]``

It seems like pin-parent is overloaded, can we split it into two
different nests?

> +SET commands format
> +===================
> +
> +``DPLL_CMD_DEVICE_SET`` - to target a dpll device, the user provides
> +``DPLL_A_ID``, which is unique identifier of dpll device in the system,
> +as well as parameter being configured (``DPLL_A_MODE``).
> +
> +``DPLL_CMD_PIN_SET`` - to target a pin user has to provide a
> +``DPLL_A_PIN_ID``, which is unique identifier of a pin in the system.
> +Also configured pin parameters must be added.
> +If ``DPLL_A_PIN_DIRECTION`` or ``DPLL_A_PIN_FREQUENCY`` are configured,
> +this affects all the dpll device they are connected, that is why those
> +attributes shall not be enclosed in ``DPLL_A_PIN_PARENT``.
> +Other attributes:
> +``DPLL_A_PIN_PRIO`` or ``DPLL_A_PIN_STATE`` must be enclosed in
> +``DPLL_A_PIN_PARENT`` as their configuration relates to only one
> +parent dpll or parent pin.

Also sounds like setting pin attrs and pin-parent attrs should be
different commands.