netdev - Re: [PATCH net-next v4 4/9] dpll: netlink: Add DPLL framework base functions

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Message-ID: <d5c30de7-df89-18dd-3ad8-a5d99c1e7108@linux.dev>
Date: Tue, 15 Aug 2023 16:18:16 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Jiri Pirko <jiri@...nulli.us>,
 Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
 Jonathan Lemon <jonathan.lemon@...il.com>, Paolo Abeni <pabeni@...hat.com>,
 Milena Olech <milena.olech@...el.com>,
 Michal Michalik <michal.michalik@...el.com>,
 linux-arm-kernel@...ts.infradead.org, poros@...hat.com, mschmidt@...hat.com,
 netdev@...r.kernel.org, linux-clk@...r.kernel.org,
 Bart Van Assche <bvanassche@....org>, intel-wired-lan@...ts.osuosl.org,
 Jiri Pirko <jiri@...dia.com>
Subject: Re: [PATCH net-next v4 4/9] dpll: netlink: Add DPLL framework base
 functions

On 15/08/2023 04:24, Jakub Kicinski wrote:
> On Fri, 11 Aug 2023 21:03:35 +0100 Vadim Fedorenko wrote:
>> +	xa_for_each(&pin->dpll_refs, i, ref) {
>> +		const struct dpll_pin_ops *ops = dpll_pin_ops(ref);
>> +		struct dpll_device *dpll = ref->dpll;
>> +
>> +		if (!ops->frequency_set)
>> +			return -EOPNOTSUPP;
>> +		ret = ops->frequency_set(pin, dpll_pin_on_dpll_priv(dpll, pin),
>> +					 dpll, dpll_priv(dpll), freq, extack);
>> +		if (ret)
>> +			return ret;
>> +		__dpll_pin_change_ntf(pin);
>> +	}
> 
> only one freq is reported in get, AFAICT, so why send a notification
> after each ref is updated?

The pin can be technically connected to several DPLLs and app may watch
for the specific DPLL messages only. We would like to inform all users 
on any DPLL which has this pin connected to.