linux-kernel - Re: [PATCH v4] arm64: dts: imx8mq: Init rates and parents configs for clocks

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Message-ID: <AM7PR04MB7015B699FDF9F4BDB69C1499EE6B0@AM7PR04MB7015.eurprd04.prod.outlook.com>
Date:   Wed, 23 Oct 2019 08:38:36 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     Viorel Suman <viorel.suman@....com>, Abel Vesa <abel.vesa@....com>,
        Peng Fan <peng.fan@....com>
CC:     Daniel Baluta <daniel.baluta@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ccaione@...libre.com" <ccaione@...libre.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "angus@...ea.ca" <angus@...ea.ca>,
        "festevam@...il.com" <festevam@...il.com>,
        "agx@...xcpu.org" <agx@...xcpu.org>, Jacky Bai <ping.bai@....com>,
        "baruch@...s.co.il" <baruch@...s.co.il>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "S.j. Wang" <shengjiu.wang@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "sboyd@...eaurora.org" <sboyd@...eaurora.org>,
        Anson Huang <anson.huang@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Subject: Re: [PATCH v4] arm64: dts: imx8mq: Init rates and parents configs for
 clocks

On 2019-10-23 9:29 AM, Viorel Suman wrote:
> On Mi, 2019-08-21 at 20:39 +0000, Leonard Crestez wrote:
>> The audio PLLs should run below 650 mHz so please use 393216000 and
>> 361267200 instead of 786432000 and 722534400. For the 8mm equivalent see
>> commit 053a4ffe2988 ("clk: imx: imx8mm: fix audio pll setting").
> 
> Hi Leonard,
> 
> Audio PLL IP on 8mm and 8mn is different than the Audio PLL IP on 8mq,
> so the requirement to run below 650 MHZ may not apply to 8mq.

This "max 650mHz" limit is from internal ADD and is also mentioned for 
imx8mq.

Peng: you made the change in our internal tree, can you confirm this 
requirement also applies to 8mq?

Viorel: Is there any impact from 393216000 vs 786432000 on PLL on audio? 
As far as I can know this rate goes through various dividers anyway.

--
Regards,
Leonard