[PATCH v2] ARM: dts: sun7i: Add wifi dt node on Banana Pro

[Maxime Ripard]

Hi,

On Thu, Jan 05, 2017 at 08:01:11PM +0100, Jörg Krause wrote:
> Hi Maxim,
> 
> On Thu, 2017-01-05 at 19:11 +0100, Maxime Ripard wrote:
> > Hi Jörg,
> > 
> > On Thu, Jan 05, 2017 at 06:37:53PM +0100, Jörg Krause wrote:
> > > The Banana Pro has an AMPAK AP6181 WiFi+Bluetooth module. The WiFi
> > > part
> > > is a BCM43362 IC connected to MMC3 of the A20 SoC via SDIO. The IC
> > > also
> > > takes a power enable signal via GPIO.
> > > 
> > > This commit adds a device-tree node to power it up, so the mmc
> > > subsys
> > > can scan it, and enables the mmc controller which is connected to
> > > it.
> > > 
> > > As the wifi enable pin of the AP6181 module is not really a
> > > regulator,
> > > switch the mmc3 node to the mmc-pwrseq framework for controlling
> > > it.
> > > This more accurately reflectes how the hardware actually works.
> > > 
> > > Signed-off-by: Jörg Krause <joerg.krause at embedded.rocks>
> > > ---
> > > Changes v2 (suggested by Maxime Ripard):
> > >   - rename pwrseq node to clarify the function rather what it's
> > >     connected to
> > >   - use dash instead of underscore for the pwrseq node name
> > >   - remove setting pull-ups for mmc3 (default since commit
> > > 37bc56128d92)
> > > 
> > > ---
> > >  arch/arm/boot/dts/sun7i-a20-bananapro.dts | 30 ++++++++++++++++++-
> > > -----------
> > >  1 file changed, 18 insertions(+), 12 deletions(-)
> > > 
> > > diff --git a/arch/arm/boot/dts/sun7i-a20-bananapro.dts
> > > b/arch/arm/boot/dts/sun7i-a20-bananapro.dts
> > > index 19d63d4049de..77f8fb76c157 100644
> > > --- a/arch/arm/boot/dts/sun7i-a20-bananapro.dts
> > > +++ b/arch/arm/boot/dts/sun7i-a20-bananapro.dts
> > > @@ -76,6 +76,13 @@
> > >  		};
> > >  	};
> > >  
> > > +	wifi_pwrseq: wifi-pwrseq {
> > > +		compatible = "mmc-pwrseq-simple";
> > > +		pinctrl-names = "default";
> > > +		pinctrl-0 = <&vmmc3_pin_bananapro>;
> > > +		reset-gpios = <&pio 7 22 GPIO_ACTIVE_LOW>;
> > > +	};
> > > +
> > >  	reg_gmac_3v3: gmac-3v3 {
> > >  		compatible = "regulator-fixed";
> > >  		pinctrl-names = "default";
> > > @@ -87,17 +94,6 @@
> > >  		enable-active-high;
> > >  		gpio = <&pio 7 23 GPIO_ACTIVE_HIGH>;
> > >  	};
> > > -
> > > -	reg_vmmc3: vmmc3 {
> > > -		compatible = "regulator-fixed";
> > > -		pinctrl-names = "default";
> > > -		pinctrl-0 = <&vmmc3_pin_bananapro>;
> > > -		regulator-name = "vmmc3";
> > > -		regulator-min-microvolt = <3300000>;
> > > -		regulator-max-microvolt = <3300000>;
> > > -		enable-active-high;
> > > -		gpio = <&pio 7 22 GPIO_ACTIVE_HIGH>;
> > > -	};
> > >  };
> > >  
> > >  &ahci {
> > > @@ -166,10 +162,20 @@
> > >  &mmc3 {
> > >  	pinctrl-names = "default";
> > >  	pinctrl-0 = <&mmc3_pins_a>;
> > > -	vmmc-supply = <&reg_vmmc3>;
> > > +	vmmc-supply = <&reg_vcc3v3>;
> > > +	mmc-pwrseq = <&wifi_pwrseq>;
> > >  	bus-width = <4>;
> > >  	non-removable;
> > > +	wakeup-source;
> > 
> > Sorry for not spotting that earlier, but this is suspicious. The PIO
> > is not able to be wake up the CPU, since it's connected to the GIC
> > that is shut down during CPU suspend. Our only wake up source is the
> > NMI controller. So either it is not able to wake up the system, or
> > the
> > interrupt line in not the right one.
> 
> Sorry, but I'm not sure I understand...
> 
> The "WIFI-HOST-WAKE" line connects "WL_HOST_WAKE" of the AP6210 to pin
> EINT15 of the A20 as shown in the schematic of the board [1].
> 
> Note, that this is the same hardware configuration as done on the
> Banana Pi M1+ [2]. The device tree node for mmc3 of the M1+ has
> "wakeup-source" enabled, too, so I inherited it. However, I did not
> tested the wake-up feature.

This is exactly the wakeup-source property that is suspicious, and
probably doesn't work on the BPi either. Either way, we don't have
suspend support at all on both of these boards, so you can just remove
it and we will figure it out later.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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