linux-kernel - Re: [PATCH v2 04/12] clk: rockchip: rk3036: enable the CLK_IGNORE_UNUSED flag for sclk_i2s_out

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Message-ID: <568F80BA.6060209@gmail.com>
Date:	Fri, 8 Jan 2016 17:26:18 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	Caesar Wang <wxt@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	leecam@...gle.com, linux-arm-kernel@...ts.infradead.org,
	keescook@...gle.com, linux-clk@...r.kernel.org, leozwang@...gle.com
Subject: Re: [PATCH v2 04/12] clk: rockchip: rk3036: enable the
 CLK_IGNORE_UNUSED flag for sclk_i2s_out

Heiko,

在 2016年01月07日 18:05, Heiko Stuebner 写道:
> Hi Caesar,
>
> Am Donnerstag, 7. Januar 2016, 16:25:47 schrieb Caesar Wang:
>> SCLk_I2S_OUT is the noc bus clock for i2s module, this clock is used by
>> extra codecs.
>>
>> Due to it shouldn't belong to any driver, but we need it enabled,
>> so just mark it as the CLK_IGNORE_UNUSED flag.
> What makes you think it shouldn't belong to any driver?
>
> In most schematics I have, i2s_clkout is going to some clock-input of the
> audio codec - probably the MCLK input on your rt5616. And while the new
> rt5616 driver does not seem to do clock handling, it should just handle the
> clock using the normal APIs.

You are right,  that's seem has to find the root cause.
I'm wonder that the codec/i2s is working in kernel v4.1 patch without it.

In general,  the MLCK will be handled in i2s driver if the cpu side is 
master.

>
>
> Heiko
>
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip

-- 
Thanks,
Caesar

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