Re: [linux-sunxi] Re: ARM: dts: sunxi: A20-OlinuXino-Lime2 raise dcdc2 lower voltage limit
On Thu, Jan 08, 2015 at 05:17:06PM +, Iain Paton wrote: On 08/01/15 03:54, wens Tsai wrote: You should lower the maximum voltage as well, either in this patch or when you redo all the regulators. AFAIK the SoC certainly cannot take up to 2.275V. The regulator nodes are supposed to say what the board can handle. Yes, I suspect several of them are not currently sensible. I just used the limits from the pmic datasheet at the time as there were no other boards with axp209 regulator defined, no fex file for the lime2 etc. I likely would have sent a full respin based on your patches, but as only bits have been applied it seemed better to do this minimal one and fix the rest properly later. I can do a couple of the other Olimex boards that I have available to test while I'm doing it. All the meaningful patches should have been merged by now, so it would be good if you could resend this with the proper limits for all the regulators enabled. Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. signature.asc Description: Digital signature
Re: [linux-sunxi] Re: ARM: dts: sunxi: A20-OlinuXino-Lime2 raise dcdc2 lower voltage limit
On 08/01/15 03:54, wens Tsai wrote: You should lower the maximum voltage as well, either in this patch or when you redo all the regulators. AFAIK the SoC certainly cannot take up to 2.275V. The regulator nodes are supposed to say what the board can handle. Yes, I suspect several of them are not currently sensible. I just used the limits from the pmic datasheet at the time as there were no other boards with axp209 regulator defined, no fex file for the lime2 etc. I likely would have sent a full respin based on your patches, but as only bits have been applied it seemed better to do this minimal one and fix the rest properly later. I can do a couple of the other Olimex boards that I have available to test while I'm doing it. Iain -- You received this message because you are subscribed to the Google Groups linux-sunxi group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[linux-sunxi] Re: ARM: dts: sunxi: A20-OlinuXino-Lime2 raise dcdc2 lower voltage limit
On Thu, Jan 8, 2015 at 6:21 AM, Iain Paton ipat...@gmail.com wrote:
The Lime2 is not stable if the cpu core voltage is reduced below 1v. To
prevent any problems when operating points are enabled, raise the pmic dcdc2
lower voltage limit to 1v.
Signed-off-by: Iain Paton ipat...@gmail.com
---
Maxime, I realise the axp209 nodes will probably end up abstracted somewhat
differently once all of the patches Chen-Yu posted are reviewed and picked
up and I can redo the lime2 dts to fit once that's done.
For now, the lime2 dts defines the full axp209 node itself including all of
the regulators, so if the lowest opp with the 0.9v setting is enabled this
will cause problems.
Up to you if you want to take this patch now or we wait until the axp209.dtsi
lands and refactor the lime2 dts appropriately then.
arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
index ed364d5..910318a 100644
--- a/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
+++ b/arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts
@@ -159,7 +159,7 @@
};
vdd_cpu: dcdc2 {
- regulator-min-microvolt =
70;
+ regulator-min-microvolt =
100;
regulator-max-microvolt =
2275000;
You should lower the maximum voltage as well, either in this patch
or when you redo all the regulators. AFAIK the SoC certainly cannot
take up to 2.275V. The regulator nodes are supposed to say what
the board can handle.
ChenYu
regulator-always-on;
};
--
2.1.3
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