linux-kernel - Re: [PATCH v2 2/4] usb: musb: core: added helper function for parsing DT

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Message-ID: <0324b2c8-ef22-2ef5-1fcd-d1a0807e549e@lechnology.com>
Date:   Wed, 26 Oct 2016 22:27:13 -0500
From:   David Lechner <david@...hnology.com>
To:     Alexandre Bailon <abailon@...libre.com>, khilman@...libre.com,
        robh+dt@...nel.org, b-liu@...com
Cc:     devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Petr Kulhavy <petr@...ix.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] usb: musb: core: added helper function for parsing
 DT

On 10/26/2016 10:03 AM, Alexandre Bailon wrote:
> From: Petr Kulhavy <petr@...ix.com>
>
> This adds the function musb_get_mode() to get the DT property "dr_mode"
>
> Signed-off-by: Petr Kulhavy <petr@...ix.com>
> Acked-by: Sergei Shtylyov <sshtylyov@...mvista.com>
> Signed-off-by: Alexandre Bailon <abailon@...libre.com>
> ---
>  drivers/usb/musb/musb_core.c | 19 +++++++++++++++++++
>  drivers/usb/musb/musb_core.h |  5 +++++
>  2 files changed, 24 insertions(+)
>
> diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
> index 27dadc0..bba07e7 100644
> --- a/drivers/usb/musb/musb_core.c
> +++ b/drivers/usb/musb/musb_core.c
> @@ -100,6 +100,7 @@
>  #include <linux/io.h>
>  #include <linux/dma-mapping.h>
>  #include <linux/usb.h>
> +#include <linux/usb/of.h>
>
>  #include "musb_core.h"
>  #include "musb_trace.h"
> @@ -130,6 +131,24 @@ static inline struct musb *dev_to_musb(struct device *dev)
>  	return dev_get_drvdata(dev);
>  }
>
> +enum musb_mode musb_get_mode(struct device *dev)
> +{
> +	enum usb_dr_mode mode;
> +
> +	mode = usb_get_dr_mode(dev);
> +	switch (mode) {
> +	case USB_DR_MODE_HOST:
> +		return MUSB_HOST;
> +	case USB_DR_MODE_PERIPHERAL:
> +		return MUSB_PERIPHERAL;
> +	case USB_DR_MODE_OTG:
> +	case USB_DR_MODE_UNKNOWN:
> +	default:
> +		return MUSB_OTG;
> +	}
> +}
> +EXPORT_SYMBOL_GPL(musb_get_mode);
> +
>  /*-------------------------------------------------------------------------*/
>
>  #ifndef CONFIG_BLACKFIN
> diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
> index 2cb88a49..a406468 100644
> --- a/drivers/usb/musb/musb_core.h
> +++ b/drivers/usb/musb/musb_core.h
> @@ -617,4 +617,9 @@ static inline void musb_platform_post_root_reset_end(struct musb *musb)
>  		musb->ops->post_root_reset_end(musb);
>  }
>
> +/* gets the "dr_mode" property from DT and converts it into musb_mode
> + * if the property is not found or not recognized returns MUSB_OTG
> + */
> +extern enum musb_mode musb_get_mode(struct device *dev);
> +
>  #endif	/* __MUSB_CORE_H__ */
>

Tested working on LEGO MINDSTORMS EV3 using dr_mode = "peripheral" and 
no vbus-supply.

Tested-By: David Lechner <david@...hnology.com>