linux-kernel - Re: [PATCH v5 6/9] usb: gadget: s3c-hsotg: get phy bus width from phy subsystem

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Date:	Fri, 13 Dec 2013 16:32:00 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Matt Porter <mporter@...aro.org>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Christian Daudt <bcm@...thebug.org>,
	Paul Zimmerman <paulz@...opsys.com>
CC:	Tomasz Figa <t.figa@...sung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Linux USB List <linux-usb@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linaro Patches <patches@...aro.org>
Subject: Re: [PATCH v5 6/9] usb: gadget: s3c-hsotg: get phy bus width from
 phy subsystem

On Thursday 12 December 2013 06:56 PM, Matt Porter wrote:
> Adds support for querying the phy bus width from the generic phy
> subsystem. Configure UTMI bus width in GUSBCFG based on this value.
> 
> Signed-off-by: Matt Porter <mporter@...aro.org>
Acked-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/usb/gadget/s3c-hsotg.c | 14 +++++++++++++-
>  drivers/usb/gadget/s3c-hsotg.h |  1 +
>  2 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
> index e9683c2..168aaa9 100644
> --- a/drivers/usb/gadget/s3c-hsotg.c
> +++ b/drivers/usb/gadget/s3c-hsotg.c
> @@ -144,6 +144,7 @@ struct s3c_hsotg_ep {
>   * @regs: The memory area mapped for accessing registers.
>   * @irq: The IRQ number we are using
>   * @supplies: Definition of USB power supplies
> + * @phyif: PHY interface width
>   * @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos.
>   * @num_of_eps: Number of available EPs (excluding EP0)
>   * @debug_root: root directrory for debugfs.
> @@ -171,6 +172,7 @@ struct s3c_hsotg {
>  
>  	struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsotg_supply_names)];
>  
> +	u32			phyif;
>  	unsigned int		dedicated_fifos:1;
>  	unsigned char           num_of_eps;
>  
> @@ -2276,7 +2278,7 @@ static void s3c_hsotg_core_init(struct s3c_hsotg *hsotg)
>  	 */
>  
>  	/* set the PLL on, remove the HNP/SRP and set the PHY */
> -	writel(GUSBCFG_PHYIf16 | GUSBCFG_TOutCal(7) |
> +	writel(hsotg->phyif | GUSBCFG_TOutCal(7) |
>  	       (0x5 << 10), hsotg->regs + GUSBCFG);
>  
>  	s3c_hsotg_init_fifo(hsotg);
> @@ -3621,6 +3623,16 @@ static int s3c_hsotg_probe(struct platform_device *pdev)
>  		goto err_supplies;
>  	}
>  
> +	/* Set default UTMI width */
> +	hsotg->phyif = GUSBCFG_PHYIf16;
> +
> +	/*
> +	 * If using the generic PHY framework, check if the PHY bus
> +	 * width is 8-bit and set the phyif appropriately.
> +	 */
> +	if (hsotg->phy && (phy_get_bus_width(phy) == 8))
> +		hsotg->phyif = GUSBCFG_PHYIf8;
> +
>  	if (hsotg->phy)
>  		phy_init(hsotg->phy);
>  
> diff --git a/drivers/usb/gadget/s3c-hsotg.h b/drivers/usb/gadget/s3c-hsotg.h
> index d650b12..85f549f 100644
> --- a/drivers/usb/gadget/s3c-hsotg.h
> +++ b/drivers/usb/gadget/s3c-hsotg.h
> @@ -55,6 +55,7 @@
>  #define GUSBCFG_HNPCap				(1 << 9)
>  #define GUSBCFG_SRPCap				(1 << 8)
>  #define GUSBCFG_PHYIf16			(1 << 3)
> +#define GUSBCFG_PHYIf8				(0 << 3)
>  #define GUSBCFG_TOutCal_MASK			(0x7 << 0)
>  #define GUSBCFG_TOutCal_SHIFT			(0)
>  #define GUSBCFG_TOutCal_LIMIT			(0x7)
> 

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