linux-kernel - Re: [PATCH] phy: omap: Adapt phy-omap-usb2 for AM437x

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Date:	Tue, 15 Oct 2013 08:22:45 -0500
From:	Felipe Balbi <balbi@...com>
To:	George Cherian <george.cherian@...com>
CC:	Mark Rutland <mark.rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"balbi@...com" <balbi@...com>, "kishon@...com" <kishon@...com>,
	"rob@...dley.net" <rob@...dley.net>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>
Subject: Re: [PATCH] phy: omap: Adapt phy-omap-usb2 for AM437x

Hi,

On Tue, Oct 15, 2013 at 12:35:12PM +0530, George Cherian wrote:
> Hi Mark,
> 
> Fixed all your comments and already sent a V2.
> 
> 
> On 10/14/2013 8:03 PM, Mark Rutland wrote:
> >On Mon, Oct 14, 2013 at 01:43:23PM +0100, George Cherian wrote:
> >>This patch adds a compatible for AM437x "ti,am43xx-usb2" to
> >>reuse the same phy-omap-usb2 driver.
> >>
> >>Also updated the documentation to add the new compatible.
> >>
> >>Signed-off-by: George Cherian <george.cherian@...com>
> >>---
> >>  Documentation/devicetree/bindings/usb/usb-phy.txt |  2 +-
> >>  drivers/phy/phy-omap-usb2.c                       | 13 ++++++++++---
> >>  2 files changed, 11 insertions(+), 4 deletions(-)
> >>
> >>diff --git a/Documentation/devicetree/bindings/usb/usb-phy.txt b/Documentation/devicetree/bindings/usb/usb-phy.txt
> >>index c0245c8..d5a7f21 100644
> >>--- a/Documentation/devicetree/bindings/usb/usb-phy.txt
> >>+++ b/Documentation/devicetree/bindings/usb/usb-phy.txt
> >>@@ -3,7 +3,7 @@ USB PHY
> >>  OMAP USB2 PHY
> >>  Required properties:
> >>- - compatible: Should be "ti,omap-usb2"
> >>+ - compatible: Should be "ti,omap-usb2" or "ti,am437x-usb2"
> >In case this needs to be modified in future, it might be best to split
> >this up one per line, with a brief description of when it applies:
> >
> >- compatible: Should contain one of:
> >   * "ti,omap-usb2" for ____ systems
> >   * "ti,am437x-usb2" for ____ systems
> >
> >>   - reg : Address and length of the register set for the device.
> >>   - #phy-cells: determine the number of cells that should be given in the
> >>     phandle while referencing this phy.
> >>diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
> >>index bfc5c33..0529c83 100644
> >>--- a/drivers/phy/phy-omap-usb2.c
> >>+++ b/drivers/phy/phy-omap-usb2.c
> >>@@ -29,6 +29,7 @@
> >>  #include <linux/delay.h>
> >>  #include <linux/usb/omap_control_usb.h>
> >>  #include <linux/phy/phy.h>
> >>+#include <linux/of.h>
> >>  #include <linux/of_platform.h>
> >>  /**
> >>@@ -172,7 +173,10 @@ static int omap_usb2_probe(struct platform_device *pdev)
> >>  	phy->dev		= &pdev->dev;
> >>  	phy->phy.dev		= phy->dev;
> >>-	phy->phy.label		= "omap-usb2";
> >>+	if (of_device_is_compatible(node, "ti,am437x-usb2"))
> >>+		phy->phy.label		= "am437x-usb2";
> >>+	else
> >>+		phy->phy.label		= "omap-usb2";
> >Instead of having this check here, you could put together a struct
> >containing the data applying to a particular compatible string, and
> >associate it with the compatible string using of_device_id::data.
> >
> >That means we don't need to duplicate the compatible strings, and it's
> >easier to extend in future.
> >
> >>  	phy->phy.set_suspend	= omap_usb2_suspend;
> >>  	phy->phy.otg		= otg;
> >>  	phy->phy.type		= USB_PHY_TYPE_USB2;
> >>@@ -201,8 +205,10 @@ static int omap_usb2_probe(struct platform_device *pdev)
> >>  	otg->set_host		= omap_usb_set_host;
> >>  	otg->set_peripheral	= omap_usb_set_peripheral;
> >>-	otg->set_vbus		= omap_usb_set_vbus;
> >>-	otg->start_srp		= omap_usb_start_srp;
> >>+	if (of_device_is_compatible(node, "ti,omap-usb2")) {
> >>+		otg->set_vbus		= omap_usb_set_vbus;
> >>+		otg->start_srp		= omap_usb_start_srp;
> >>+	}
> >Similarly here.

so you prefer the driver data approach ? I would rather have feature
flags as driver_data instead of passing function pointers. In fact I
have suggested that on another thread which reached linux-usb.

-- 
balbi

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