Kevin Hilman had written, on 10/05/2009 11:56 AM, the following:
"Premi, Sanjeev" <pr...@ti.com> writes:
-----Original Message-----
From: Nishanth Menon [mailto:menon.nisha...@gmail.com]
Sent: Saturday, October 03, 2009 8:35 PM
To: Premi, Sanjeev
Cc: linux-omap@vger.kernel.org
Subject: Question on OPP table handling
Sanjeev Premi said the following on 10/01/2009 01:03 PM:
+struct omap_opp omap3_mpu_rate_table[] = {
+ {0, 0, 0},
+ /*OPP1*/
+ {S125M, VDD1_OPP1, 0x1E},
+ /*OPP2*/
+ {S250M, VDD1_OPP2, 0x26},
+ /*OPP3*/
+ {S500M, VDD1_OPP3, 0x30},
+ /*OPP4*/
+ {S550M, VDD1_OPP4, 0x36},
+ /*OPP5*/
+ {S600M, VDD1_OPP5, 0x3C},
+};
For those involved,
if we wanted to convert omap3_mpu_table[] into
*omap3_mpu_table so that
we dynamically initialize it based on cpu type - what would be the
recommendations?
Nishanth,
Good idea!
As a table, previous patch enables it (not as intent, but due to syntax):
> +/* struct omap_opp_table - View OPP table as an object
> + * @min: Minimum OPP id
> + * @max: Maximim OPP id
> + * @opps: Pointer to array defining the OPPs.
> + *
> + * An OPP table has varied length. Knowing minimum and maximum
> + * OPP ids allow easy traversal.
> + */
> +struct omap_opp_table {
> + u8 min;
> + u8 max;
> + struct omap_opp* opps;
> +};
But now, I think it would be good to have an API that can fill an opp_table:
int add_opp_definition(u8 id, u32 freq, u16 vsel);
...and, if an array is preferred, length can be set as:
int set_opp_table_length (u8 max);
I'm all for dynamic OPP setting, but not as an array. A list should
probably be used.
Won't a list implementation cause more than necessary overhead? I agree
that something like set_opp_table_length probably might be redundant in
that case.
If I were to extend the discussion from other thread on toggling the valid OPPs
based on "enable_off_mode", these could be handy.
int set_opp_valid(bool flag);
bool is_opp_valid(void);
Yes, we need a concept of a valid OPP, not just for OFF mode, but for
OSWR and possibly for a full constraint framework as well.
Ack.
--
Regards,
Nishanth Menon
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