On 2024/2/15 6:47, Bryan O'Donoghue wrote:
On 14/02/2024 14:52, Mark Brown wrote:
On Wed, Feb 14, 2024 at 02:44:56PM +0000, Bryan O'Donoghue wrote:
On 14/02/2024 14:13, Mark Brown wrote:
Not just that but also note that every voltage step in the range will
have the 8mV offset added.
The documents I have just show sensors attached to ldo3, ldo4 and
ldo6 fixed
at 1.808.
I don't think there's any better or different information than a
+200000uV
increment TBH.
This seems like a very surprising and unusual hardware design, the
1.808V voltage is already unusual. Note that this may break systems
that are trying to set a range of say 1.8-2.0V if they actually need to
set 2V.
Hmm. I'm sure the rail value should be 1.808 its all over the
documentation for example when we get to index 3 we hit 2608000
REGULATOR_LINEAR_RANGE(1808000, 0, 2, 200000),
1808000 0
2008000 1
2208000 2
2408000 x
REGULATOR_LINEAR_RANGE(2608000, 3, 28, 16000),
And there are other rails @ 1v8 if 1v8
The one thing I can't easily verify is index 0 = 1808000 and not say
1800000 or indeed that the increment is 200000 and not say 8000.
I'll see if I can ask around with the hw people and get a more complete
answer.
Similarly now that you've gotten me digging into this problem, it's not
clear to me why this regulator isn't just a linear regulator with an 8mv
increment over a range of indexes.
At least the documentation I'm looking at doesn't elucidate.
I'll dig some more.
Please see the voltage steps for LDO3/4/6 described in the PM8010 TDOS
document which is the most authoritative that we used internally for
PMIC driver development:
Index Vset (mV)
0 1800
1 2000
2 2200
3 2608
4 2624
5 2640
6 2656
7 2672
8 2688
9 2704
10 2720
11 2736
12 2752
13 2768
14 2784
15 2800
16 2816
17 2832
18 2848
19 2864
20 2880
21 2896
22 2912
23 2928
24 2944
25 2960
26 2976
27 2992
28 3008
29 3104
30 3200
31 3312
And I do see from the document change history that step 0 was changed
from 1808mV and step 2 was changed from 2512mV, I don't know the reason
of the change though.
Fenglin
---
bod
