On 05/22/2015 02:45 PM, Andrew Bresticker wrote:
> On Thu, May 21, 2015 at 4:57 PM, Ezequiel Garcia
> <ezequiel.gar...@imgtec.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.r...@imgtec.com>
>> Signed-off-by: Ezequiel Garcia <ezequiel.gar...@imgtec.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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