[PATCH 0/6] ARM: dts: sunxi: Enable otg support on a23/a33 boards

[PATCH 0/6] ARM: dts: sunxi: Enable otg support on a23/a33 boards

[Hans de Goede]

Hi All,

All the necessary bits for this have been merged in the various foo-next
tree-s, so lets merge the dts bits and enable full otg support on these
boards.

Note that we cannot yet do this for a31 based boards as the axp221 pmic
has a quirk where it will not generate interrupts for vbus state changes
when it itself is driving vbus. I've a patch to work around this, but
this patch is part of a larger set which still needs to be merged.

Regards,

Hans
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[PATCH 1/6] ARM: dts: axp22x.dtsi: Disable axp22x ldo_io# regulators by default

[Hans de Goede]

Use of these as regulators conflicts with use of the gpio pins as
gpios, so disabled the ldo_io# regulators by default, this avoids
the regulator core touching them when the pins are used as gpios.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/axp22x.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/axp22x.dtsi b/arch/arm/boot/dts/axp22x.dtsi
index 76302f5..0cfec50 100644
--- a/arch/arm/boot/dts/axp22x.dtsi
+++ b/arch/arm/boot/dts/axp22x.dtsi
@@ -126,10 +126,12 @@
 
 		reg_ldo_io0: ldo_io0 {
 			regulator-name = "ldo_io0";
+			status = "disabled";
 		};
 
 		reg_ldo_io1: ldo_io1 {
 			regulator-name = "ldo_io1";
+			status = "disabled";
 		};
 
 		reg_rtc_ldo: rtc_ldo {
-- 
2.7.4

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[PATCH 2/6] ARM: dts: axp22x.dtsi: Add usb_power_supply node

[Hans de Goede]

Add a node describing the (optional) usbpower-supply of the
axp221 / axp223 pmic.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/axp22x.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/axp22x.dtsi b/arch/arm/boot/dts/axp22x.dtsi
index 0cfec50..0401787 100644
--- a/arch/arm/boot/dts/axp22x.dtsi
+++ b/arch/arm/boot/dts/axp22x.dtsi
@@ -142,4 +142,9 @@
 			regulator-name = "rtc_ldo";
 		};
 	};
+
+	usb_power_supply: usb_power_supply {
+		compatible = "x-powers,axp221-usb-power-supply";
+		status = "disabled";
+	};
 };
-- 
2.7.4

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[PATCH 3/6] ARM: dts: axp22x.dtsi: Add reg_drivebus node

[Hans de Goede]

Add a node describing the drivebus regulator which is an (optional)
part of the axp221/axp223 pmic. Since this regulator may not be
available at all depending on the board, mark it as disabled by
default.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/axp22x.dtsi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/boot/dts/axp22x.dtsi b/arch/arm/boot/dts/axp22x.dtsi
index 0401787..458b668 100644
--- a/arch/arm/boot/dts/axp22x.dtsi
+++ b/arch/arm/boot/dts/axp22x.dtsi
@@ -141,6 +141,11 @@
 			regulator-max-microvolt = <3000000>;
 			regulator-name = "rtc_ldo";
 		};
+
+		reg_drivevbus: drivevbus {
+			regulator-name = "drivevbus";
+			status = "disabled";
+		};
 	};
 
 	usb_power_supply: usb_power_supply {
-- 
2.7.4

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[PATCH 4/6] ARM: dts: sun8i-a?3-q8-tablet.dts: Add full otg support

[Hans de Goede]

Now that we've all the necessary bits in place we can enable
full otg support on these tablets.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-q8-tablet.dts | 15 ---------------
 arch/arm/boot/dts/sun8i-a33-q8-tablet.dts | 15 ---------------
 arch/arm/boot/dts/sun8i-q8-common.dtsi    | 31 +++++++++++++++++++++++++++++++
 3 files changed, 31 insertions(+), 30 deletions(-)

diff --git a/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
index 6062ea7..956320a 100644
--- a/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
+++ b/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
@@ -48,18 +48,3 @@
 	model = "Q8 A23 Tablet";
 	compatible = "allwinner,q8-a23", "allwinner,sun8i-a23";
 };
-
-/*
- * FIXME for now we only support host mode and rely on u-boot to have
- * turned on Vbus which is controlled by the axp223 pmic on the board.
- *
- * Once we have axp223 support we should switch to fully supporting otg.
- */
-&usb_otg {
-	dr_mode = "host";
-	status = "okay";
-};
-
-&usbphy {
-	status = "okay";
-};
diff --git a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
index 44b3229..b0bc236 100644
--- a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
+++ b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
@@ -48,18 +48,3 @@
 	model = "Q8 A33 Tablet";
 	compatible = "allwinner,q8-a33", "allwinner,sun8i-a33";
 };
-
-/*
- * FIXME for now we only support host mode and rely on u-boot to have
- * turned on Vbus which is controlled by the axp223 pmic on the board.
- *
- * Once we have axp223 support we should switch to fully supporting otg.
- */
-&usb_otg {
-	dr_mode = "host";
-	status = "okay";
-};
-
-&usbphy {
-	status = "okay";
-};
diff --git a/arch/arm/boot/dts/sun8i-q8-common.dtsi b/arch/arm/boot/dts/sun8i-q8-common.dtsi
index 346a49d..991087f 100644
--- a/arch/arm/boot/dts/sun8i-q8-common.dtsi
+++ b/arch/arm/boot/dts/sun8i-q8-common.dtsi
@@ -87,6 +87,13 @@
 		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
 		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
 	};
+
+	usb0_id_detect_pin: usb0_id_detect_pin@0 {
+		allwinner,pins = "PH8";
+		allwinner,function = "gpio_in";
+		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
+	};
 };
 
 &r_rsb {
@@ -98,6 +105,7 @@
 		interrupt-parent = <&nmi_intc>;
 		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
 		eldoin-supply = <&reg_dcdc1>;
+		x-powers,drive-vbus-en;
 	};
 };
 
@@ -163,6 +171,11 @@
 	regulator-name = "vcc-dram";
 };
 
+&reg_drivevbus {
+	regulator-name = "usb0-vbus";
+	status = "okay";
+};
+
 &reg_rtc_ldo {
 	regulator-name = "vcc-rtc";
 };
@@ -176,3 +189,21 @@
 &simplefb_lcd {
 	vcc-lcd-supply = <&reg_dc1sw>;
 };
+
+&usb_otg {
+	dr_mode = "otg";
+	status = "okay";
+};
+
+&usb_power_supply {
+	status = "okay";
+};
+
+&usbphy {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb0_id_detect_pin>;
+	usb0_id_det-gpio = <&pio 7 8 GPIO_ACTIVE_HIGH>; /* PH8 */
+	usb0_vbus_power-supply = <&usb_power_supply>;
+	usb0_vbus-supply = <&reg_drivevbus>;
+	status = "okay";
+};
-- 
2.7.4

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Re: [PATCH 4/6] ARM: dts: sun8i-a?3-q8-tablet.dts: Add full otg support

[Chen-Yu Tsai]

Hi,

On Sat, Jun 11, 2016 at 9:53 PM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> Now that we've all the necessary bits in place we can enable
> full otg support on these tablets.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  arch/arm/boot/dts/sun8i-a23-q8-tablet.dts | 15 ---------------
>  arch/arm/boot/dts/sun8i-a33-q8-tablet.dts | 15 ---------------
>  arch/arm/boot/dts/sun8i-q8-common.dtsi    | 31 +++++++++++++++++++++++++++++++
>  3 files changed, 31 insertions(+), 30 deletions(-)
>
> diff --git a/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
> index 6062ea7..956320a 100644
> --- a/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
> +++ b/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
> @@ -48,18 +48,3 @@
>         model = "Q8 A23 Tablet";
>         compatible = "allwinner,q8-a23", "allwinner,sun8i-a23";
>  };
> -
> -/*
> - * FIXME for now we only support host mode and rely on u-boot to have
> - * turned on Vbus which is controlled by the axp223 pmic on the board.
> - *
> - * Once we have axp223 support we should switch to fully supporting otg.
> - */
> -&usb_otg {
> -       dr_mode = "host";
> -       status = "okay";
> -};
> -
> -&usbphy {
> -       status = "okay";
> -};
> diff --git a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
> index 44b3229..b0bc236 100644
> --- a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
> +++ b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
> @@ -48,18 +48,3 @@
>         model = "Q8 A33 Tablet";
>         compatible = "allwinner,q8-a33", "allwinner,sun8i-a33";
>  };
> -
> -/*
> - * FIXME for now we only support host mode and rely on u-boot to have
> - * turned on Vbus which is controlled by the axp223 pmic on the board.
> - *
> - * Once we have axp223 support we should switch to fully supporting otg.
> - */
> -&usb_otg {
> -       dr_mode = "host";
> -       status = "okay";
> -};
> -
> -&usbphy {
> -       status = "okay";
> -};
> diff --git a/arch/arm/boot/dts/sun8i-q8-common.dtsi b/arch/arm/boot/dts/sun8i-q8-common.dtsi
> index 346a49d..991087f 100644
> --- a/arch/arm/boot/dts/sun8i-q8-common.dtsi
> +++ b/arch/arm/boot/dts/sun8i-q8-common.dtsi
> @@ -87,6 +87,13 @@
>                 allwinner,drive = <SUN4I_PINCTRL_10_MA>;
>                 allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
>         };
> +
> +       usb0_id_detect_pin: usb0_id_detect_pin@0 {
> +               allwinner,pins = "PH8";
> +               allwinner,function = "gpio_in";
> +               allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> +               allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
> +       };
>  };
>
>  &r_rsb {
> @@ -98,6 +105,7 @@
>                 interrupt-parent = <&nmi_intc>;
>                 interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>                 eldoin-supply = <&reg_dcdc1>;
> +               x-powers,drive-vbus-en;
>         };
>  };
>
> @@ -163,6 +171,11 @@
>         regulator-name = "vcc-dram";
>  };
>
> +&reg_drivevbus {
> +       regulator-name = "usb0-vbus";
> +       status = "okay";

Adding a drivevbus-supply referencing vcc_5v0 (in the axp node) so
it doesn't show 0V would be nice.

Sorry for the late reply. I was out on vacation for a few days.

ChenYu

> +};
> +
>  &reg_rtc_ldo {
>         regulator-name = "vcc-rtc";
>  };
> @@ -176,3 +189,21 @@
>  &simplefb_lcd {
>         vcc-lcd-supply = <&reg_dc1sw>;
>  };
> +
> +&usb_otg {
> +       dr_mode = "otg";
> +       status = "okay";
> +};
> +
> +&usb_power_supply {
> +       status = "okay";
> +};
> +
> +&usbphy {
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&usb0_id_detect_pin>;
> +       usb0_id_det-gpio = <&pio 7 8 GPIO_ACTIVE_HIGH>; /* PH8 */
> +       usb0_vbus_power-supply = <&usb_power_supply>;
> +       usb0_vbus-supply = <&reg_drivevbus>;
> +       status = "okay";
> +};
> --
> 2.7.4
>
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Re: [PATCH 4/6] ARM: dts: sun8i-a?3-q8-tablet.dts: Add full otg support

[Hans de Goede]

Hi,

On 13-06-16 05:19, Chen-Yu Tsai wrote:
> Hi,
>
> On Sat, Jun 11, 2016 at 9:53 PM, Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>> Now that we've all the necessary bits in place we can enable
>> full otg support on these tablets.
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>>  arch/arm/boot/dts/sun8i-a23-q8-tablet.dts | 15 ---------------
>>  arch/arm/boot/dts/sun8i-a33-q8-tablet.dts | 15 ---------------
>>  arch/arm/boot/dts/sun8i-q8-common.dtsi    | 31 +++++++++++++++++++++++++++++++
>>  3 files changed, 31 insertions(+), 30 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
>> index 6062ea7..956320a 100644
>> --- a/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
>> +++ b/arch/arm/boot/dts/sun8i-a23-q8-tablet.dts
>> @@ -48,18 +48,3 @@
>>         model = "Q8 A23 Tablet";
>>         compatible = "allwinner,q8-a23", "allwinner,sun8i-a23";
>>  };
>> -
>> -/*
>> - * FIXME for now we only support host mode and rely on u-boot to have
>> - * turned on Vbus which is controlled by the axp223 pmic on the board.
>> - *
>> - * Once we have axp223 support we should switch to fully supporting otg.
>> - */
>> -&usb_otg {
>> -       dr_mode = "host";
>> -       status = "okay";
>> -};
>> -
>> -&usbphy {
>> -       status = "okay";
>> -};
>> diff --git a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
>> index 44b3229..b0bc236 100644
>> --- a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
>> +++ b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
>> @@ -48,18 +48,3 @@
>>         model = "Q8 A33 Tablet";
>>         compatible = "allwinner,q8-a33", "allwinner,sun8i-a33";
>>  };
>> -
>> -/*
>> - * FIXME for now we only support host mode and rely on u-boot to have
>> - * turned on Vbus which is controlled by the axp223 pmic on the board.
>> - *
>> - * Once we have axp223 support we should switch to fully supporting otg.
>> - */
>> -&usb_otg {
>> -       dr_mode = "host";
>> -       status = "okay";
>> -};
>> -
>> -&usbphy {
>> -       status = "okay";
>> -};
>> diff --git a/arch/arm/boot/dts/sun8i-q8-common.dtsi b/arch/arm/boot/dts/sun8i-q8-common.dtsi
>> index 346a49d..991087f 100644
>> --- a/arch/arm/boot/dts/sun8i-q8-common.dtsi
>> +++ b/arch/arm/boot/dts/sun8i-q8-common.dtsi
>> @@ -87,6 +87,13 @@
>>                 allwinner,drive = <SUN4I_PINCTRL_10_MA>;
>>                 allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
>>         };
>> +
>> +       usb0_id_detect_pin: usb0_id_detect_pin@0 {
>> +               allwinner,pins = "PH8";
>> +               allwinner,function = "gpio_in";
>> +               allwinner,drive = <SUN4I_PINCTRL_10_MA>;
>> +               allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
>> +       };
>>  };
>>
>>  &r_rsb {
>> @@ -98,6 +105,7 @@
>>                 interrupt-parent = <&nmi_intc>;
>>                 interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>>                 eldoin-supply = <&reg_dcdc1>;
>> +               x-powers,drive-vbus-en;
>>         };
>>  };
>>
>> @@ -163,6 +171,11 @@
>>         regulator-name = "vcc-dram";
>>  };
>>
>> +&reg_drivevbus {
>> +       regulator-name = "usb0-vbus";
>> +       status = "okay";
>
> Adding a drivevbus-supply referencing vcc_5v0 (in the axp node) so
> it doesn't show 0V would be nice.

Ack, given that you've just asked for this with a number of boards,
I think that this belongs in axp22x.dtsi. I'll prepare a follow-up patch for
this.

Regards,

Hans



>
> Sorry for the late reply. I was out on vacation for a few days.
>
> ChenYu
>
>> +};
>> +
>>  &reg_rtc_ldo {
>>         regulator-name = "vcc-rtc";
>>  };
>> @@ -176,3 +189,21 @@
>>  &simplefb_lcd {
>>         vcc-lcd-supply = <&reg_dc1sw>;
>>  };
>> +
>> +&usb_otg {
>> +       dr_mode = "otg";
>> +       status = "okay";
>> +};
>> +
>> +&usb_power_supply {
>> +       status = "okay";
>> +};
>> +
>> +&usbphy {
>> +       pinctrl-names = "default";
>> +       pinctrl-0 = <&usb0_id_detect_pin>;
>> +       usb0_id_det-gpio = <&pio 7 8 GPIO_ACTIVE_HIGH>; /* PH8 */
>> +       usb0_vbus_power-supply = <&usb_power_supply>;
>> +       usb0_vbus-supply = <&reg_drivevbus>;
>> +       status = "okay";
>> +};
>> --
>> 2.7.4
>>
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[PATCH 5/6] ARM: dts: sun8i-a23-polaroid-mid2809pxe04: Add full otg support

[Hans de Goede]

Now that we've all the necessary bits in place we can enable
full otg support on these tablets.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 .../boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts   | 30 +++++++++++++++++-----
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
index cb5daaf..bae779f 100644
--- a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
+++ b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
@@ -131,6 +131,13 @@
 		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
 		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
 	};
+
+	usb0_id_detect_pin: usb0_id_detect_pin@0 {
+		allwinner,pins = "PH8";
+		allwinner,function = "gpio_in";
+		allwinner,drive = <SUN4I_PINCTRL_10_MA>;
+		allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
+	};
 };
 
 &pwm {
@@ -148,6 +155,7 @@
 		interrupt-parent = <&nmi_intc>;
 		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
 		eldoin-supply = <&reg_dcdc1>;
+		x-powers,drive-vbus-en;
 	};
 };
 
@@ -219,6 +227,11 @@
 	regulator-name = "vcc-dram";
 };
 
+&reg_drivevbus {
+	regulator-name = "usb0-vbus";
+	status = "okay";
+};
+
 &reg_rtc_ldo {
 	regulator-name = "vcc-rtc";
 };
@@ -227,17 +240,20 @@
 	vcc-lcd-supply = <&reg_dc1sw>;
 };
 
-/*
- * FIXME for now we only support host mode and rely on u-boot to have
- * turned on Vbus which is controlled by the axp223 pmic on the board.
- *
- * Once we have axp223 support we should switch to fully supporting otg.
- */
 &usb_otg {
-	dr_mode = "host";
+	dr_mode = "otg";
+	status = "okay";
+};
+
+&usb_power_supply {
 	status = "okay";
 };
 
 &usbphy {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb0_id_detect_pin>;
+	usb0_id_det-gpio = <&pio 7 8 GPIO_ACTIVE_HIGH>; /* PH8 */
+	usb0_vbus_power-supply = <&usb_power_supply>;
+	usb0_vbus-supply = <&reg_drivevbus>;
 	status = "okay";
 };
-- 
2.7.4

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[PATCH 6/6] ARM: dts: sun8i-a23-polaroid-mid2809pxe04: Disable ehci0

[Hans de Goede]

The Polaroid mid2809pxe04 tablet uses an sdio esp8089 wifi chip, so
ehci0 is not used and should be disabled.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
index bae779f..e8c3f21 100644
--- a/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
+++ b/arch/arm/boot/dts/sun8i-a23-polaroid-mid2809pxe04.dts
@@ -72,10 +72,6 @@
 	};
 };
 
-&ehci0 {
-	status = "okay";
-};
-
 &i2c0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c0_pins_a>;
-- 
2.7.4

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Re: [PATCH 0/6] ARM: dts: sunxi: Enable otg support on a23/a33 boards

[Maxime Ripard]

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On Sat, Jun 11, 2016 at 03:53:00PM +0200, Hans de Goede wrote:
> Hi All,
> 
> All the necessary bits for this have been merged in the various foo-next
> tree-s, so lets merge the dts bits and enable full otg support on these
> boards.
> 
> Note that we cannot yet do this for a31 based boards as the axp221 pmic
> has a quirk where it will not generate interrupts for vbus state changes
> when it itself is driving vbus. I've a patch to work around this, but
> this patch is part of a larger set which still needs to be merged.

Applied all of them, thanks!
Maxime

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

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