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Subject: Re: [PATCH] ARM64: dts: meson-gxbb-odroidc2: Fix usb phy regulator
 warning
To:     Anand Moon <linux.amoon@gmail.com>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org
Cc:     Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Jerome Brunet <jbrunet@baylibre.com>
References: <20190111092235.28161-1-linux.amoon@gmail.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <772bd70c-2cd9-a1be-d18f-7824a9ea0556@baylibre.com>
Date:   Fri, 11 Jan 2019 14:40:49 +0100
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In-Reply-To: <20190111092235.28161-1-linux.amoon@gmail.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Anand,

On 11/01/2019 10:22, Anand Moon wrote:
> Add missing vin-supply 5V regulator node on usb_phy nodes needed
> to power usb bus ports. Override the dr_mode from "host" to "peripheral"
> for initialization of dwc2 usb0 phy node,changes fix the below
> warning for usb initialization.

I would have switch the dr_mode to peripheral in another patch,
fix the regulator issue in this patch only.

Neil

> 
> [    1.203900] phy phy-c0000000.phy.0: USB ID detect failed!
> [    1.208048] phy phy-c0000000.phy.0: phy poweron failed --> -22
> [    1.213877] WARNING: CPU: 1 PID: 44 at drivers/regulator/core.c:2054 _regulator_put.part.11+0xf0/0xf8
> [    1.222953] Modules linked in:
> [    1.225976] CPU: 1 PID: 44 Comm: kworker/1:1 Not tainted 5.0.0-rc1-xc2ml #3
> [    1.232872] Hardware name: Hardkernel ODROID-C2 (DT)
> [    1.237794] Workqueue: events deferred_probe_work_func
> [    1.242878] pstate: 80000005 (Nzcv daif -PAN -UAO)
> [    1.247623] pc : _regulator_put.part.11+0xf0/0xf8
> [    1.252280] lr : regulator_put+0x34/0x48
> [    1.256159] sp : ffff00001176bb00
> [    1.259437] x29: ffff00001176bb00 x28: 0000000000000000
> [    1.264698] x27: ffff80007f31beb8 x26: ffff000010eeb7e0
> [    1.269959] x25: 0000000000000000 x24: 0000000000000009
> [    1.275220] x23: ffff00001176bbc8 x22: ffff80007ed9d500
> [    1.280482] x21: ffff0000111bd6c8 x20: ffff80007ed9d700
> [    1.285743] x19: ffff80007ed9d700 x18: 000000000000006f
> [    1.291004] x17: 0000000000000000 x16: 0000000000000000
> [    1.296265] x15: 0000000000000400 x14: 0000000000000400
> [    1.301527] x13: ff00000000000000 x12: ffffffffffffffff
> [    1.306788] x11: 0000000000000038 x10: 0000000000000040
> [    1.312049] x9 : ffff0000111d58b0 x8 : ffff0000111d58a8
> [    1.317310] x7 : ffff80007ed9db00 x6 : ffff80007ec21b00
> [    1.322571] x5 : ffff80007f400248 x4 : ffff80007fba9b00
> [    1.327833] x3 : ffff0000112d9eb8 x2 : ffff80007ec21b00
> [    1.333094] x1 : 0000000000000000 x0 : 0000000000000001
> [    1.338356] Call trace:
> [    1.340773]  _regulator_put.part.11+0xf0/0xf8
> [    1.345085]  regulator_put+0x34/0x48
> [    1.348621]  regulator_bulk_free+0x30/0x50
> [    1.352675]  devm_regulator_bulk_release+0x18/0x20
> [    1.357421]  release_nodes+0x1b0/0x220
> [    1.361127]  devres_release_all+0x34/0x50
> [    1.365094]  really_probe+0xec/0x290
> [    1.368630]  driver_probe_device+0x54/0xe8
> [    1.372684]  __device_attach_driver+0xb8/0xe8
> [    1.376997]  bus_for_each_drv+0x78/0xc8
> [    1.380792]  __device_attach+0xd4/0x130
> [    1.384587]  device_initial_probe+0x10/0x18
> [    1.388727]  bus_probe_device+0x90/0x98
> [    1.392522]  deferred_probe_work_func+0x6c/0xa0
> [    1.397010]  process_one_work+0x1e0/0x318
> [    1.400975]  worker_thread+0x228/0x428
> [    1.404684]  kthread+0x124/0x128
> [    1.407876]  ret_from_fork+0x10/0x18
> [    1.411410] ---[ end trace de5fd1b262c1f56a ]---
> [    1.416055] WARNING: CPU: 1 PID: 44 at drivers/regulator/core.c:2054 _regulator_put.part.11+0xf0/0xf8
> [    1.425123] Modules linked in:
> [    1.428144] CPU: 1 PID: 44 Comm: kworker/1:1 Tainted: G        W         5.0.0-rc1-xc2ml #3
> [    1.436422] Hardware name: Hardkernel ODROID-C2 (DT)
> [    1.441340] Workqueue: events deferred_probe_work_func
> 
> Fixes: 5a0803bd5ae (ARM64: dts: meson-gxbb-odroidc2: Enable USB Nodes)
> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> Cc: Jerome Brunet <jbrunet@baylibre.com>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
> Fix the following power issue with usb device
> 
> [  795.380156] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> [  798.356073] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> [  801.331999] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> [  804.307919] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> [  807.283844] usb 1-1.2: reset high-speed USB device number 3 using dwc2
> 
> [alarm@archl-c2m ~]$ lsusb -t
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M
>     |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
>         |__ Port 1: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 480M
>         |__ Port 2: Dev 5, If 3, Class=Audio, Driver=, 480M
>         |__ Port 2: Dev 5, If 1, Class=Video, Driver=uvcvideo, 480M
>         |__ Port 2: Dev 5, If 2, Class=Audio, Driver=, 480M
>         |__ Port 2: Dev 5, If 0, Class=Video, Driver=uvcvideo, 480M
>         |__ Port 3: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 480M
> 
> Similar Fix is need for Odroid C1+ to power on the phy nodes
> ---
>  arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> index 2e1cd5e3a246..b4e14ff614c4 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
> @@ -28,6 +28,13 @@
>  		reg = <0x0 0x0 0x0 0x80000000>;
>  	};
>  
> +	p5v0: regulator-p5v0 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "P5V0";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +	};
> +
>  	usb_otg_pwr: regulator-usb-pwrs {
>  		compatible = "regulator-fixed";
>  
> @@ -36,6 +43,8 @@
>  		regulator-min-microvolt = <5000000>;
>  		regulator-max-microvolt = <5000000>;
>  
> +		vin-supply = <&p5v0>;
> +
>  		gpio = <&gpio_ao GPIOAO_5 GPIO_ACTIVE_HIGH>;
>  		enable-active-high;
>  	};
> @@ -303,6 +312,7 @@
>  
>  &usb0 {
>  	status = "okay";
> +	dr_mode = "peripheral";
>  };
>  
>  &usb1 {
>