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Date:   Mon, 16 Jan 2017 08:26:21 -0200
From:   Bruno Herrera <bruherrera@...il.com>
To:     Alexandre Torgue <alexandre.torgue@...com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [v2 2/3] ARM: dts: STM32 Add USB FS host mode support

Hi Alex,

On Mon, Jan 16, 2017 at 6:57 AM, Alexandre Torgue
<alexandre.torgue@...com> wrote:
> Hi Bruno,
>
> On 01/16/2017 03:09 AM, Bruno Herrera wrote:
>>
>> This patch adds the USB pins and nodes for USB HS/FS cores working at FS
>> speed,
>> using embedded PHY.
>>
>> Signed-off-by: Bruno Herrera <bruherrera@...il.com>
>
>
> Sorry, but what is patch 1 & pacth 3 status ?

My bad, I'll add the status of the patch series version 3.
>
> For this one, can split it in 3 patches (one patch for SOC and one for each
> board) please.
>

No problem.
>
>
>> ---
>>  arch/arm/boot/dts/stm32f429-disco.dts | 30 ++++++++++++++++++++++++++++++
>>  arch/arm/boot/dts/stm32f429.dtsi      | 35
>> ++++++++++++++++++++++++++++++++++-
>>  arch/arm/boot/dts/stm32f469-disco.dts | 30 ++++++++++++++++++++++++++++++
>>  3 files changed, 94 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/stm32f429-disco.dts
>> b/arch/arm/boot/dts/stm32f429-disco.dts
>> index 7d0415e..374c5ed 100644
>> --- a/arch/arm/boot/dts/stm32f429-disco.dts
>> +++ b/arch/arm/boot/dts/stm32f429-disco.dts
>> @@ -88,6 +88,16 @@
>>                         gpios = <&gpioa 0 0>;
>>                 };
>>         };
>> +
>> +       /* This turns on vbus for otg for host mode (dwc2) */
>> +       vcc5v_otg: vcc5v-otg-regulator {
>> +               compatible = "regulator-fixed";
>> +               gpio = <&gpioc 4 0>;
>> +               pinctrl-names = "default";
>> +               pinctrl-0 = <&usbotg_pwren_h>;
>> +               regulator-name = "vcc5_host1";
>> +               regulator-always-on;
>> +       };
>>  };
>>
>>  &clk_hse {
>> @@ -99,3 +109,23 @@
>>         pinctrl-names = "default";
>>         status = "okay";
>>  };
>> +
>> +&usbotg_hs {
>> +       compatible = "st,stm32-fsotg", "snps,dwc2";
>> +       dr_mode = "host";
>> +       pinctrl-0 = <&usbotg_fs_pins_b>;
>> +       pinctrl-names = "default";
>> +       status = "okay";
>> +};
>> +
>> +&pinctrl {
>> +       usb-host {
>> +               usbotg_pwren_h: usbotg-pwren-h {
>> +                       pins {
>> +                               pinmux = <STM32F429_PC4_FUNC_GPIO>;
>> +                               bias-disable;
>> +                               drive-push-pull;
>> +                       };
>> +               };
>> +       };
>> +};
>
>
> Pinctrl muxing has to be defined/declared in stm32f429.dtsi
>
This is board specific logic and it vary from board to board, should
it be defined here?
>
>
>> diff --git a/arch/arm/boot/dts/stm32f429.dtsi
>> b/arch/arm/boot/dts/stm32f429.dtsi
>> index e4dae0e..bc07aa8 100644
>> --- a/arch/arm/boot/dts/stm32f429.dtsi
>> +++ b/arch/arm/boot/dts/stm32f429.dtsi
>> @@ -206,7 +206,7 @@
>>                         reg = <0x40007000 0x400>;
>>                 };
>>
>> -               pin-controller {
>> +               pinctrl: pin-controller {
>>                         #address-cells = <1>;
>>                         #size-cells = <1>;
>>                         compatible = "st,stm32f429-pinctrl";
>> @@ -316,6 +316,30 @@
>>                                 };
>>                         };
>>
>> +                       usbotg_fs_pins_a: usbotg_fs@0 {
>> +                               pins {
>> +                                       pinmux =
>> <STM32F429_PA10_FUNC_OTG_FS_ID>,
>> +
>> <STM32F429_PA11_FUNC_OTG_FS_DM>,
>> +
>> <STM32F429_PA12_FUNC_OTG_FS_DP>;
>> +                                       bias-disable;
>> +                                       drive-push-pull;
>> +                                       slew-rate = <2>;
>> +                               };
>> +                       };
>> +
>> +                       usbotg_fs_pins_b: usbotg_fs@1 {
>> +                               pins {
>> +                                       pinmux =
>> <STM32F429_PB12_FUNC_OTG_HS_ID>,
>> +
>> <STM32F429_PB14_FUNC_OTG_HS_DM>,
>> +
>> <STM32F429_PB15_FUNC_OTG_HS_DP>;
>> +                                       bias-disable;
>> +                                       drive-push-pull;
>> +                                       slew-rate = <2>;
>> +                               };
>> +                       };
>> +
>> +
>> +
>>                         usbotg_hs_pins_a: usbotg_hs@0 {
>>                                 pins {
>>                                         pinmux =
>> <STM32F429_PH4_FUNC_OTG_HS_ULPI_NXT>,
>> @@ -420,6 +444,15 @@
>>                         status = "disabled";
>>                 };
>>
>> +               usbotg_fs: usb@...00000 {
>> +                       compatible = "st,stm32f4xx-fsotg", "snps,dwc2";
>> +                       reg = <0x50000000 0x40000>;
>> +                       interrupts = <67>;
>> +                       clocks = <&rcc 0 39>;
>> +                       clock-names = "otg";
>> +                       status = "disabled";
>> +               };
>> +
>>                 rng: rng@...60800 {
>>                         compatible = "st,stm32-rng";
>>                         reg = <0x50060800 0x400>;
>> diff --git a/arch/arm/boot/dts/stm32f469-disco.dts
>> b/arch/arm/boot/dts/stm32f469-disco.dts
>> index 8877c00..8ae6763 100644
>> --- a/arch/arm/boot/dts/stm32f469-disco.dts
>> +++ b/arch/arm/boot/dts/stm32f469-disco.dts
>> @@ -68,6 +68,17 @@
>>         soc {
>>                 dma-ranges = <0xc0000000 0x0 0x10000000>;
>>         };
>> +
>> +       /* This turns on vbus for otg for host mode (dwc2) */
>> +       vcc5v_otg: vcc5v-otg-regulator {
>> +               compatible = "regulator-fixed";
>> +               enable-active-high;
>> +               gpio = <&gpiob 2 0>;
>> +               pinctrl-names = "default";
>> +               pinctrl-0 = <&usbotg_pwren_h>;
>> +               regulator-name = "vcc5_host1";
>> +               regulator-always-on;
>> +       };
>>  };
>>
>>  &rcc {
>> @@ -81,3 +92,22 @@
>>  &usart3 {
>>         status = "okay";
>>  };
>> +
>> +&usbotg_fs {
>> +       dr_mode = "host";
>> +       pinctrl-0 = <&usbotg_fs_pins_a>;
>> +       pinctrl-names = "default";
>> +       status = "okay";
>> +};
>> +
>> +&pinctrl {
>> +       usb-host {
>> +               usbotg_pwren_h: usbotg-pwren-h {
>> +                       pins {
>> +                               pinmux = <STM32F429_PB2_FUNC_GPIO>;
>> +                               bias-disable;
>> +                               drive-push-pull;
>> +                       };
>> +               };
>> +       };
>> +};
>
> Same. Note that if you have 2 configuration for one feature (like it is here
> for "usbotg_pwren_h"), you could index it. Not that I'm adding a dedidacted
> pinctroller for stm32f469.
>
Sorry, but I dont know what you mean by index here.
The usbotg_pwren_h (VBUS ENABLE) is attached in different port/pins
for each board.

Br.,


> Br
> Alex
>>
>>
>
>

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