linux-kernel - Re: [PATCH 02/15] usb: phy: omap-usb2: use the new generic PHY framework

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Message-ID: <20130718072149.GB16720@kroah.com>
Date:	Thu, 18 Jul 2013 00:21:49 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	kyungmin.park@...sung.com, balbi@...com, jg1.han@...sung.com,
	s.nawrocki@...sung.com, kgene.kim@...sung.com,
	grant.likely@...aro.org, tony@...mide.com, arnd@...db.de,
	swarren@...dia.com, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
	linux-fbdev@...r.kernel.org, akpm@...ux-foundation.org,
	balajitk@...com, george.cherian@...com, nsekhar@...com
Subject: Re: [PATCH 02/15] usb: phy: omap-usb2: use the new generic PHY
 framework

On Thu, Jul 18, 2013 at 12:16:11PM +0530, Kishon Vijay Abraham I wrote:
> Used the generic PHY framework API to create the PHY. Now the power off and
> power on are done in omap_usb_power_off and omap_usb_power_on respectively.
> 
> However using the old USB PHY library cannot be completely removed
> because OTG is intertwined with PHY and moving to the new framework
> will break OTG. Once we have a separate OTG state machine, we
> can get rid of the USB PHY library.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Acked-by: Felipe Balbi <balbi@...com>
> ---
>  drivers/usb/phy/Kconfig         |    1 +
>  drivers/usb/phy/phy-omap-usb2.c |   45 +++++++++++++++++++++++++++++++++++----
>  2 files changed, 42 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index 3622fff..cc55993 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -75,6 +75,7 @@ config OMAP_CONTROL_USB
>  config OMAP_USB2
>  	tristate "OMAP USB2 PHY Driver"
>  	depends on ARCH_OMAP2PLUS
> +	depends on GENERIC_PHY
>  	select OMAP_CONTROL_USB
>  	help
>  	  Enable this to support the transceiver that is part of SOC. This
> diff --git a/drivers/usb/phy/phy-omap-usb2.c b/drivers/usb/phy/phy-omap-usb2.c
> index 844ab68..751b30f 100644
> --- a/drivers/usb/phy/phy-omap-usb2.c
> +++ b/drivers/usb/phy/phy-omap-usb2.c
> @@ -28,6 +28,7 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/delay.h>
>  #include <linux/usb/omap_control_usb.h>
> +#include <linux/phy/phy.h>
>  
>  /**
>   * omap_usb2_set_comparator - links the comparator present in the sytem with
> @@ -119,10 +120,36 @@ static int omap_usb2_suspend(struct usb_phy *x, int suspend)
>  	return 0;
>  }
>  
> +static int omap_usb_power_off(struct phy *x)
> +{
> +	struct omap_usb *phy = phy_get_drvdata(x);
> +
> +	omap_control_usb_phy_power(phy->control_dev, 0);
> +
> +	return 0;
> +}
> +
> +static int omap_usb_power_on(struct phy *x)
> +{
> +	struct omap_usb *phy = phy_get_drvdata(x);
> +
> +	omap_control_usb_phy_power(phy->control_dev, 1);
> +
> +	return 0;
> +}
> +
> +static struct phy_ops ops = {
> +	.power_on	= omap_usb_power_on,
> +	.power_off	= omap_usb_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
>  static int omap_usb2_probe(struct platform_device *pdev)
>  {
>  	struct omap_usb			*phy;
> +	struct phy			*generic_phy;
>  	struct usb_otg			*otg;
> +	struct phy_provider		*phy_provider;
>  
>  	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
>  	if (!phy) {
> @@ -144,6 +171,11 @@ static int omap_usb2_probe(struct platform_device *pdev)
>  	phy->phy.otg		= otg;
>  	phy->phy.type		= USB_PHY_TYPE_USB2;
>  
> +	phy_provider = devm_of_phy_provider_register(phy->dev,
> +			of_phy_simple_xlate);
> +	if (IS_ERR(phy_provider))
> +		return PTR_ERR(phy_provider);
> +
>  	phy->control_dev = omap_get_control_dev();
>  	if (IS_ERR(phy->control_dev)) {
>  		dev_dbg(&pdev->dev, "Failed to get control device\n");
> @@ -159,6 +191,15 @@ static int omap_usb2_probe(struct platform_device *pdev)
>  	otg->start_srp		= omap_usb_start_srp;
>  	otg->phy		= &phy->phy;
>  
> +	platform_set_drvdata(pdev, phy);
> +	pm_runtime_enable(phy->dev);
> +
> +	generic_phy = devm_phy_create(phy->dev, 0, &ops, "omap-usb2");
> +	if (IS_ERR(generic_phy))
> +		return PTR_ERR(generic_phy);

So, if I have two of these controllers in my system, I can't create the
second phy because the name for it will be identical to the first?
That's why the phy core should handle the id, and not rely on the
drivers to set it, as they have no idea how many they have in the
system.

thanks,

greg k-h
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