linux-kernel - Re: [PATCH] clk: rockchip: rk3288: i2s_frac adds flag to set parent's rate

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Date:	Tue, 30 Sep 2014 11:44:44 +0800
From:	Jianqun <xjq@...k-chips.com>
To:	Kever Yang <kever.yang@...k-chips.com>,
	Jianqun <jay.xu@...k-chips.com>, mturquette@...aro.org,
	dianders@...omium.org, heiko@...ech.de, dbasehore@...omium.org,
	mark.yao@...k-chips.com
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	huangtao@...k-chips.com, cf@...k-chips.com,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] clk: rockchip: rk3288: i2s_frac adds flag to set parent's
 rate



在 09/30/2014 11:38 AM, Kever Yang 写道:
> Hi Jianqun,
> 
>     pls add linux-rockchip@...ts.infradead.org next time.
> 
OK, thanks
> On 09/30/2014 11:12 AM, Jianqun wrote:
>> The relation of i2s nodes as follows:
>>            i2s_src               0           0            594000000  0
>>               i2s_frac           0           0            11289600   0
>>                  i2s_pre         0           0            11289600   0
>>                     sclk_i2s0    0           0            11289600   0
>>                     i2s0_clkout  0           0            11289600   0
>>                        hclk_i2s0 1           1            99000000   0
> I always got the result as following when I set sclk_i2s0 to 11289600,
> any one knows the reason?
> 
>       gpll                     6           6            594000000 0
>           sclk_emmc             1           1            99000000 0
>           i2s_src               0           0            11207548 0
>              i2s_pre            0           0            11207548 0
>                 sclk_i2s0       0           0            11207548 0
>                 i2s0_clkout     0           0            11207548 0
>              i2s_frac           0           0            646456897 0
Hi, as clock tree shows, i2s_pre should come from i2s_frac, that's the root different above two trees.

>> sclk_i2s0 is the master clock, when to set rate of sclk_i2s0, should
>> allow to set its parent's rate, by add flag CLK_SET_RATE_PARENT for
>> "i2s_frac", "i2s_pre", "i2s0_clkout" and "sclk_i2s0".
>>
>> Tested on rk3288 board using max98090, with command "aplay <music.wav>"
>>
>> Change-Id: I12faad082566532b65a7de8c0a6845e1c17870e6
>> Signed-off-by: Jianqun <jay.xu@...k-chips.com>
>> ---
>>   drivers/clk/rockchip/clk-rk3288.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/clk/rockchip/clk-rk3288.c b/drivers/clk/rockchip/clk-rk3288.c
>> index c770de0..baf19b4 100644
>> --- a/drivers/clk/rockchip/clk-rk3288.c
>> +++ b/drivers/clk/rockchip/clk-rk3288.c
>> @@ -301,15 +301,15 @@ static struct rockchip_clk_branch rk3288_clk_branches[] __initdata = {
>>       COMPOSITE(0, "i2s_src", mux_pll_src_cpll_gpll_p, 0,
>>               RK3288_CLKSEL_CON(4), 15, 1, MFLAGS, 0, 7, DFLAGS,
>>               RK3288_CLKGATE_CON(4), 1, GFLAGS),
>> -    COMPOSITE_FRAC(0, "i2s_frac", "i2s_src", 0,
>> +    COMPOSITE_FRAC(0, "i2s_frac", "i2s_src", CLK_SET_RATE_PARENT,
>>               RK3288_CLKSEL_CON(8), 0,
>>               RK3288_CLKGATE_CON(4), 2, GFLAGS),
>> -    MUX(0, "i2s_pre", mux_i2s_pre_p, 0,
>> +    MUX(0, "i2s_pre", mux_i2s_pre_p, CLK_SET_RATE_PARENT,
>>               RK3288_CLKSEL_CON(4), 8, 2, MFLAGS),
>> -    COMPOSITE_NODIV(0, "i2s0_clkout", mux_i2s_clkout_p, 0,
>> +    COMPOSITE_NODIV(0, "i2s0_clkout", mux_i2s_clkout_p, CLK_SET_RATE_PARENT,
>>               RK3288_CLKSEL_CON(4), 12, 1, MFLAGS,
>>               RK3288_CLKGATE_CON(4), 0, GFLAGS),
>> -    GATE(SCLK_I2S0, "sclk_i2s0", "i2s_pre", 0,
>> +    GATE(SCLK_I2S0, "sclk_i2s0", "i2s_pre", CLK_SET_RATE_PARENT,
>>               RK3288_CLKGATE_CON(4), 3, GFLAGS),
>>         MUX(0, "spdif_src", mux_pll_src_cpll_gpll_p, 0,
> 
> 
> 
> 

-- 
Jianqun Xu

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