linux-kernel - Re: [PATCH 7/9] clk: pistachio: Add a rate table for the MIPS PLL

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Date:	Fri, 22 May 2015 14:45:13 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...tec.com>
To:	Andrew Bresticker <abrestic@...omium.org>
CC:	Linux-MIPS <linux-mips@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	James Hartley <james.hartley@...tec.com>,
	Govindraj Raja <Govindraj.Raja@...tec.com>,
	Damien Horsley <Damien.Horsley@...tec.com>,
	Kevin Cernekee <cernekee@...omium.org>,
	James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH 7/9] clk: pistachio: Add a rate table for the MIPS PLL



On 05/22/2015 02:45 PM, Andrew Bresticker wrote:
> On Thu, May 21, 2015 at 4:57 PM, Ezequiel Garcia
> <ezequiel.garcia@...tec.com> wrote:
>> This commit adds a rate parameter table, which makes it possible for
>> the MIPS PLL to support rate change.
>>
>> Signed-off-by: Govindraj Raja <Govindraj.Raja@...tec.com>
>> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...tec.com>
>> ---
>>  drivers/clk/pistachio/clk-pistachio.c | 12 +++++++++++-
>>  drivers/clk/pistachio/clk.h           | 12 ++++++++++++
>>  2 files changed, 23 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/pistachio/clk-pistachio.c b/drivers/clk/pistachio/clk-pistachio.c
>> index 22a7ebd..0ac7429 100644
>> --- a/drivers/clk/pistachio/clk-pistachio.c
>> +++ b/drivers/clk/pistachio/clk-pistachio.c
>> @@ -145,8 +145,18 @@ static struct pistachio_mux pistachio_muxes[] __initdata = {
>>         MUX(CLK_BT_PLL_MUX, "bt_pll_mux", mux_xtal_bt, 0x200, 17),
>>  };
>>
>> +static struct pistachio_pll_rate_table mips_pll_rates[] = {
>> +       MIPS_PLL_RATES(52000000, 416000000, 1, 16, 2, 1),
>> +       MIPS_PLL_RATES(52000000, 442000000, 1, 17, 2, 1),
>> +       MIPS_PLL_RATES(52000000, 468000000, 1, 18, 2, 1),
>> +       MIPS_PLL_RATES(52000000, 494000000, 1, 19, 2, 1),
>> +       MIPS_PLL_RATES(52000000, 520000000, 1, 20, 2, 1),
>> +       MIPS_PLL_RATES(52000000, 546000000, 1, 21, 2, 1),
>> +};
>> +
>>  static struct pistachio_pll pistachio_plls[] __initdata = {
>> -       PLL_FIXED(CLK_MIPS_PLL, "mips_pll", "xtal", PLL_GF40LP_LAINT, 0x0),
>> +       PLL(CLK_MIPS_PLL, "mips_pll", "xtal", PLL_GF40LP_LAINT, 0x0,
>> +           mips_pll_rates),
>>         PLL_FIXED(CLK_AUDIO_PLL, "audio_pll", "audio_refclk_mux",
>>                   PLL_GF40LP_FRAC, 0xc),
>>         PLL_FIXED(CLK_RPU_V_PLL, "rpu_v_pll", "xtal", PLL_GF40LP_LAINT, 0x20),
>> diff --git a/drivers/clk/pistachio/clk.h b/drivers/clk/pistachio/clk.h
>> index 3bb6bbe..b5d22d6 100644
>> --- a/drivers/clk/pistachio/clk.h
>> +++ b/drivers/clk/pistachio/clk.h
>> @@ -121,6 +121,18 @@ struct pistachio_pll_rate_table {
>>         unsigned int frac;
>>  };
>>
>> +#define MIPS_PLL_RATES(_fref, _fout, _refdiv, _fbdiv,  \
>> +                      _postdiv1, _postdiv2)            \
>> +{                                                       \
>> +       .fref           = _fref,                        \
>> +       .fout           = _fout,                        \
>> +       .refdiv         = _refdiv,                      \
>> +       .fbdiv          = _fbdiv,                       \
>> +       .postdiv1       = _postdiv1,                    \
>> +       .postdiv2       = _postdiv2,                    \
>> +       .frac           = 0,                            \
>> +}
> 
> Wouldn't this be applicable to any integer PLL, not just MIPS_PLL?
> Also, maybe we should just populate fout_{min,max} here, setting them
> to _fout?  See my comment in patch 3/9.
> 

Yes, you are right. An INT_PLL_RATE would be OK, setting frac to 0 and
fout_{min,max} to fout.

I'll respin.
-- 
Ezequiel
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