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Fri, 12 Mar 2021 13:01:57 +0100 (CET) Received: from ssl.serverraum.org (ssl.serverraum.org [176.9.125.105]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id B9B46F801D8 for ; Fri, 12 Mar 2021 13:01:43 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz B9B46F801D8 Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=walle.cc header.i=@walle.cc header.b="iaj7o6dL" Received: from ssl.serverraum.org (web.serverraum.org [172.16.0.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id 9B6AC22238; Fri, 12 Mar 2021 13:01:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1615550502; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fW2gTmh4PzgbJrGWy/381fOG4Lx9Rw+iMj4STBKbzXc=; b=iaj7o6dL1mWyPoPOEazdaiHA68HsVTcD2IfHTNByW16TuaT+wokwGVZpyjVLNsvzDu4ufY kt7WueG1k02GKHrkht1oWyMJEvYRzWpi5JkC5vwmta2TTZeSTZTy7fl8RKjYhf1Vtd6W+6 1Efo06VnGYEf29lcBWXB0JqFA3kFzdg= MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Fri, 12 Mar 2021 13:01:41 +0100 From: Michael Walle To: Mark Brown Subject: Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock In-Reply-To: <20210312113544.GB5348@sirena.org.uk> References: <1612939421-19900-2-git-send-email-spujar@nvidia.com> <20210309144156.18887-1-michael@walle.cc> <611ed3362dee3b3b7c7a80edfe763fd0@walle.cc> <20210311161558.GG4962@sirena.org.uk> <20210312113544.GB5348@sirena.org.uk> User-Agent: Roundcube Webmail/1.4.11 Message-ID: <6ed28bb5330879b1919aced5174f319f@walle.cc> X-Sender: michael@walle.cc Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org, kuninori.morimoto.gx@renesas.com, robh@kernel.org, Sameer Pujar , linux-kernel@vger.kernel.org, jonathanh@nvidia.com, sharadg@nvidia.com, thierry.reding@gmail.com, linux-tegra@vger.kernel.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" Am 2021-03-12 12:35, schrieb Mark Brown: > On Thu, Mar 11, 2021 at 11:11:15PM +0100, Michael Walle wrote: >> Am 2021-03-11 17:15, schrieb Mark Brown: > >> > The trick is figuring out if it's best to vary the input clock >> > or to use the FLL to adapt a fixed input clock, > >> For simple-audio-card you can set the "clock" property if you want >> that clock to be changed/enabled/disabled. But that doesn't seem to >> be the way to go, at least it was NAKed by Rob for the >> audio-graph-card. >> I don't see a way to figure out if MCLK should be controlled by >> simple-*-card without adding further properties to the device tree. > > If the card has a clock API clock as sysclk then set_sysclk(() should > be configuring that clock. What do you mean by "the card". The simple-audio-card itself? Take a look at: https://elixir.bootlin.com/linux/v5.12-rc2/source/arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28-var3-ads2.dts#L29 Does the card has a clock? IMHO the WM8904 codec has a clock, but not the audio card. -michael