[linux-sunxi] Re: [PATCH v5 8/8] ARM: sun7i/sun4i: dt: Add AXP209 support to various boards

[Carlo Caione]

On Tue, May 6, 2014 at 12:51 AM, Maxime Ripard
<maxime.ripard at free-electrons.com> wrote:
> On Sat, May 03, 2014 at 02:21:06PM +0200, Carlo Caione wrote:
>> On Sat, May 3, 2014 at 3:09 AM, Maxime Ripard
>> <maxime.ripard at free-electrons.com> wrote:
>> > Hi,
>> >
>> > On Thu, May 01, 2014 at 02:29:34PM +0200, Carlo Caione wrote:
>> >> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
>> >> Signed-off-by: Carlo Caione <carlo at caione.org>
>> >> ---
>> >>  arch/arm/boot/dts/sun4i-a10-a1000.dts           | 58 ++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun4i-a10-cubieboard.dts      | 58 ++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun4i-a10-hackberry.dts       | 64 ++++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun4i-a10-inet97fv2.dts       | 58 ++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun4i-a10-mini-xplus.dts      | 65 +++++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun4i-a10-olinuxino-lime.dts  | 64 ++++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun4i-a10-pcduino.dts         | 58 ++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun7i-a20-cubieboard2.dts     | 59 ++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun7i-a20-cubietruck.dts      | 59 ++++++++++++++++++++++
>> >>  arch/arm/boot/dts/sun7i-a20-olinuxino-micro.dts | 59 ++++++++++++++++++++++
>> >>  10 files changed, 602 insertions(+)
>> >>
>> >> diff --git a/arch/arm/boot/dts/sun4i-a10-a1000.dts b/arch/arm/boot/dts/sun4i-a10-a1000.dts
>> >> index fa746aea..57d3fb4 100644
>> >> --- a/arch/arm/boot/dts/sun4i-a10-a1000.dts
>> >> +++ b/arch/arm/boot/dts/sun4i-a10-a1000.dts
>> >> @@ -88,6 +88,56 @@
>> >>                       pinctrl-names = "default";
>> >>                       pinctrl-0 = <&i2c0_pins_a>;
>> >>                       status = "okay";
>> >> +
>> >> +                     axp209: pmic at 34 {
>> >> +                             compatible = "x-powers,axp209";
>> >> +                             reg = <0x34>;
>> >> +                             interrupts = <0>;
>> >> +
>> >> +                             interrupt-controller;
>> >> +                             #interrupt-cells = <1>;
>> >> +
>> >> +                             acin-supply = <&reg_axp_ipsout>;
>> >> +                             vin2-supply = <&reg_axp_ipsout>;
>> >> +                             vin3-supply = <&reg_axp_ipsout>;
>> >> +                             ldo24in-supply = <&reg_axp_ipsout>;
>> >> +                             ldo3in-supply = <&reg_axp_ipsout>;
>> >> +                             ldo5in-supply = <&reg_axp_ipsout>;
>> >> +
>> >> +                             regulators {
>> >> +                                     x-powers,dcdc-freq = <1500>;
>> >> +
>> >> +                                     axp_vcore_reg: dcdc2 {
>> >> +                                             regulator-min-microvolt = <700000>;
>> >> +                                             regulator-max-microvolt = <2275000>;
>> >> +                                             regulator-always-on;
>> >> +                                     };
>> >> +
>> >> +                                     axp_ddr_reg: dcdc3 {
>> >> +                                             regulator-always-on;
>> >> +                                     };
>> >> +
>> >> +                                     axp_rtc_reg: ldo1 {
>> >> +                                             regulator-always-on;
>> >> +                                     };
>> >> +
>> >> +                                     axp_analog_reg: ldo2 {
>> >> +                                             regulator-always-on;
>> >> +                                     };
>> >> +
>> >> +                                     axp_pll_reg: ldo3 {
>> >> +                                             regulator-always-on;
>> >> +                                     };
>> >> +
>> >> +                                     axp_hdmi_reg: ldo4 {
>> >> +                                             regulator-always-on;
>> >> +                                     };
>> >> +
>> >> +                                     axp_mic_reg: ldo5 {
>> >> +                                             regulator-always-on;
>> >
>> > Do all these regulators need to be always on? It makes sense for the
>> > pll and vcore, but I don't get why the mic and hdmi regulators need
>> > this.
>>
>> I did this way because I don't have the schematics for all the board
>> so I thought it was safer to leave all the regulators enabled
>
> Well, we have the schematics for most of these boards (at least all
> the cubie and olinuxinos).
>
> As far as the other boards are concerned, if we don't have that
> information, I'd say leave them alone until someone has access to
> these informations.

What do you mean exactly with "leave them alone". The problem is that
if the regulator is not explicitly marked as always-on, it is disabled
at boot time, so I think that the most safe thing to do is leave them
on to avoid turning off something at boot time that could be
important.

-- 
Carlo Caione