linux-kernel - Re: [PATCH 1/4] ARM: aspeed: g4: Add USB functions to pinctrl bindings

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Message-ID: <1498535619.3651.29.camel@kernel.crashing.org>
Date:   Mon, 26 Jun 2017 22:53:39 -0500
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Andrew Jeffery <andrew@...id.au>, linus.walleij@...aro.org
Cc:     robh+dt@...nel.org, mark.rutland@....com, joel@....id.au,
        ryan_chen@...eedtech.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org
Subject: Re: [PATCH 1/4] ARM: aspeed: g4: Add USB functions to pinctrl
 bindings

On Tue, 2017-06-27 at 11:42 +0930, Andrew Jeffery wrote:
> The AST2400 contains several USB controllers:
> 
> * USB 1.1 Host Controller
> * USB 2.0 Host Controller
> * Combined USB 2.0 Virtual Hub and USB 1.1 HID Controller

There's also a USB1.1 HID-only device-controller, but it's a legacy
piece of IP that we may never support. It might be worth mentioning its
existence and Ryan might want it supported in the bindings at least no
?

> Pins for three ports are routed to the three controllers such that:
> 
> * Port 1 is a dedicated USB 1.1 host port
> * Port 2 is shared between the USB 1.1 host and HID controllers
> * Port 3 is shared between the USB 2.0 host and Hub controllers
> 
> As the pins for port 1 are fixed function there is no associated mux
> function or group described in the bindings. Ports 2 and 3 are muxed as
> above, and the table below describes the mapping between pinmux function
> names and ports:
> 
> Port  | USB Version  | USB Mode  | Mux Function
> ------|--------------|-----------|-------------
> 1     | 1.1          | Host      | -
> 2     | 1.1          | Host      | USB11H2
> 2     | 1.1          | Device    | USB11D1
> 3     | 2.0          | Host      | USB2H1
> 3     | 2.0          | Device    | USB2D1
> 
> Signed-off-by: Andrew Jeffery <andrew@...id.au>
> ---
>  Documentation/devicetree/bindings/pinctrl/pinctrl-aspeed.txt | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-aspeed.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-aspeed.txt
> index ca01710ee29a..09142dab47db 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-aspeed.txt
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-aspeed.txt
> @@ -69,8 +69,9 @@ PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 RGMII1 RGMII2 RMII1 RMII2 ROM16 ROM8 ROMCS1
>  ROMCS2 ROMCS3 ROMCS4 RXD1 RXD2 RXD3 RXD4 SALT1 SALT2 SALT3 SALT4 SD1 SD2 SGPMCK
>  SGPMI SGPMLD SGPMO SGPSCK SGPSI0 SGPSI1 SGPSLD SIOONCTRL SIOPBI SIOPBO SIOPWREQ
>  SIOPWRGD SIOS3 SIOS5 SIOSCI SPI1 SPI1DEBUG SPI1PASSTHRU SPICS1 TIMER3 TIMER4
> -TIMER5 TIMER6 TIMER7 TIMER8 TXD1 TXD2 TXD3 TXD4 UART6 USBCKI VGABIOS_ROM VGAHS
> -VGAVS VPI18 VPI24 VPI30 VPO12 VPO24 WDTRST1 WDTRST2
> +TIMER5 TIMER6 TIMER7 TIMER8 TXD1 TXD2 TXD3 TXD4 UART6 USB11D1 USB11H2 USB2D1
> +USB2H1 USBCKI VGABIOS_ROM VGAHS VGAVS VPI18 VPI24 VPI30 VPO12 VPO24 WDTRST1
> +WDTRST2
>  
>  aspeed,ast2500-pinctrl, aspeed,g5-pinctrl:
>