From: boris.brezillon@free-electrons.com (Boris Brezillon)
To: linux-arm-kernel@lists.infradead.org
Subject: sama5d4, configure pck1 with dt?
Date: Thu, 7 Jul 2016 09:15:12 +0200 [thread overview]
Message-ID: <20160707091512.387ea113@bbrezillon> (raw)
In-Reply-To: <alpine.DEB.2.02.1607062239210.12243@pmeerw.net>
Hi Peter,
On Wed, 6 Jul 2016 23:17:07 +0200 (CEST)
Peter Meerwald-Stadler <pmeerw@pmeerw.net> wrote:
> Hello,
>
> how do I configure pck1 using devicetree to be used as the master
> clock for an audio codec?
>
> in particular how do I choose the clock source and frequency for pck1?
> is there a way to do this using devicetree?
>
> or is the code in at91sam9g20ek_audio_probe() the way to go?
> i.e mclk=clk_get(0, "pck1"); pllb=clk_get(0, "pllb"); clk_set_parent(mclk,
> pllb); clk_set_rate(mclk, 12000000);
It's as simple as that:
mclk = clk_get(<your-device>, "<audio-clk-name>");
clk_set_rate(mclk, <rate>);
<your-device> should not be NULL, <audio-clk-name> should not be pck1
(see the DT binding doc), and you should not manually re-parent the mclk
clk (the driver select the best parent when clk_set_rate() is
called).
Regards,
Boris
next prev parent reply other threads:[~2016-07-07 7:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-06 21:17 sama5d4, configure pck1 with dt? Peter Meerwald-Stadler
2016-07-07 7:15 ` Boris Brezillon [this message]
2016-07-13 9:02 ` Peter Meerwald-Stadler
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