Hi, On 27-07-15 03:28, Timo Sigurdsson wrote:
sun7i-a20-bananapi.dts doesn't contain regulator nodes for the AXP209 PMU driver, so add them to allow for voltage-scaling with cpufreq-dt. With the regulators enabled, we can define board-specific operating points. The defined CPU voltages are more conservative (based on the values used by the vendor), so they should be more failsafe across all boards of this kind out there. I'm posting this as RFC as I would like to make a few more remarks and raise questions along the way (plus, I'm anything but an experienced developer, so a a critical review might help). I checked the regulator definitions against the schematics released by LeMaker. I also compared that to the DT and schematics of Cubiboard 2 and Cubietruck. Of course, I also tested the patch on the actual hardware and it works fine for me. The CPU voltages are slightly higher than those set in sun7i-a20.dtsi and even though they work well for me, I thought it might be safer to use the more conservative values used by LeMaker in their old fex file. Would you agree? Besides, it it ok to have this in one patch or should it be splitted in two (one for the regulators and one for the opp)? Did I miss something important? Signed-off-by: Timo Sigurdsson <public_timo.s@xxxxxxxxxxxxxx>
I've a simular patch here: https://github.com/jwrdegoede/linux-sunxi/commit/6a30b7d5be6012b81e5e1439a444e41c0ac1afc1 I did not submit this upstream yet as it is part of a series to enable the otg controller on the bananapi which needs axp-usb-power-supply support for which the actual powersupply driver changes are still pending. As you can see other then you adding the cpu operating points are patches are identical, which is good :) IMHO we should just stick with the standard operating points unless we know that there are stability issues with them (such as e.g. on the A10 OlinuxIno Lime). Regards, Hans
--- arch/arm/boot/dts/sun7i-a20-bananapi.dts | 47 +++++++++++++++++++++++++++++--- 1 file changed, 43 insertions(+), 4 deletions(-) diff --git a/arch/arm/boot/dts/sun7i-a20-bananapi.dts b/arch/arm/boot/dts/sun7i-a20-bananapi.dts index 9f7b472..2bcbb0e 100644 --- a/arch/arm/boot/dts/sun7i-a20-bananapi.dts +++ b/arch/arm/boot/dts/sun7i-a20-bananapi.dts @@ -92,6 +92,22 @@ status = "okay"; }; +&cpu0 { + cpu-supply = <®_dcdc2>; + operating-points = < + /* kHz uV */ + 1008000 1450000 + 960000 1425000 + 912000 1425000 + 864000 1350000 + 720000 1250000 + 528000 1150000 + 312000 1100000 + 144000 1050000 + >; + cooling-max-level = <7>; +}; + &ehci0 { status = "okay"; }; @@ -119,13 +135,9 @@ status = "okay"; axp209: pmic@34 { - compatible = "x-powers,axp209"; reg = <0x34>; interrupt-parent = <&nmi_intc>; interrupts = <0 IRQ_TYPE_LEVEL_LOW>; - - interrupt-controller; - #interrupt-cells = <1>; }; }; @@ -182,6 +194,33 @@ }; }; +#include "axp209.dtsi" + +®_dcdc2 { + regulator-always-on; + regulator-min-microvolt = <1050000>; + regulator-max-microvolt = <1450000>; + regulator-name = "vdd-cpu"; +}; + +®_dcdc3 { + regulator-always-on; + regulator-min-microvolt = <1000000>; + regulator-max-microvolt = <1400000>; + regulator-name = "vdd-int-dll"; +}; + +®_ldo1 { + regulator-name = "vdd-rtc"; +}; + +®_ldo2 { + regulator-always-on; + regulator-min-microvolt = <3000000>; + regulator-max-microvolt = <3000000>; + regulator-name = "avcc"; +}; + ®_usb1_vbus { status = "okay"; };
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