linux-kernel - Re: [PATCH 2.6.34-rc4 4/8] mx5: Add USB OTG port registration

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Message-ID: <20100414073032.GY30801@buzzloop.caiaq.de>
Date:	Wed, 14 Apr 2010 09:30:32 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	Bryan Wu <bryan.wu@...onical.com>
Cc:	Dinh.Nguyen@...escale.com, linux-kernel@...r.kernel.org,
	amit.kucheria@...onical.com, linux@....linux.org.uk,
	s.hauer@...gutronix.de, grant.likely@...retlab.ca,
	r.herring@...escale.com, linux-arm-kernel@...ts.infradead.org,
	valentin.longchamp@...l.ch
Subject: Re: [PATCH 2.6.34-rc4 4/8] mx5: Add USB OTG port registration

On Tue, Apr 13, 2010 at 11:58:04PM -0700, Bryan Wu wrote:
> On 04/13/2010 09:10 AM, Dinh.Nguyen@...escale.com wrote:
> >From: Dinh Nguyen<Dinh.Nguyen@...escale.com>
> >
> >This patch adds the device platform registration for enabling USB
> >host functionality on the OTG port on Freescale MX51 Babbage HW. This
> >file makes platform specific calls to initialize the USB HW.
> >
> >This patch applies to 2.6.34-rc4.
> >
> >Signed-off-by: Dinh Nguyen<Dinh.Nguyen@...escale.com>
> >---
> >  arch/arm/mach-mx5/Makefile             |    2 +-
> >  arch/arm/mach-mx5/board-mx51_babbage.c |    4 ++
> 
> Agree with Daniel here, this patch should be split into 2 parts, a)
> for usb_dr.c and Makefile, b) for board-mx51_babbage.c change.
> 
> And one more suggestion is merge usb_dr.c and usb_h1.c as one file
> usb.c. It is more simple to maintain and review.

I don't think usb_dr.c is needed at all, as its content is not anything
that should be shared between boards. Those definitions should be placed
in mx51_babbage.c alltogether.

But we're disussing at the wrong end of the patch set; once the
mx5-generic parts have been fixed, the interface to board support code
will also change.

Daniel


> >  arch/arm/mach-mx5/usb_dr.c             |   57 ++++++++++++++++++++++++++++++++
> >  3 files changed, 62 insertions(+), 1 deletions(-)
> >  create mode 100644 arch/arm/mach-mx5/usb_dr.c
> >
> >diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile
> >index bf23f86..3fca1f1 100644
> >--- a/arch/arm/mach-mx5/Makefile
> >+++ b/arch/arm/mach-mx5/Makefile
> >@@ -3,7 +3,7 @@
> >  #
> >
> >  # Object file lists.
> >-obj-y   := cpu.o mm.o clock-mx51.o devices.o
> >+obj-y   := cpu.o mm.o clock-mx51.o devices.o usb_dr.o
> >
> >  obj-$(CONFIG_MACH_MX51_BABBAGE) += board-mx51_babbage.o
> >
> >diff --git a/arch/arm/mach-mx5/board-mx51_babbage.c b/arch/arm/mach-mx5/board-mx51_babbage.c
> >index afbe400..4e196d7 100644
> >--- a/arch/arm/mach-mx5/board-mx51_babbage.c
> >+++ b/arch/arm/mach-mx5/board-mx51_babbage.c
> >@@ -27,6 +27,8 @@
> >
> >  #include "devices.h"
> >
> >+extern void __init mx5_usb_dr_init(void);
> >+
> >  static struct platform_device *devices[] __initdata = {
> >  	&mxc_fec_device,
> >  };
> >@@ -78,6 +80,8 @@ static void __init mxc_board_init(void)
> >  	platform_add_devices(devices, ARRAY_SIZE(devices));
> >
> >  	mxc_register_gpios();
> >+
> >+	mx5_usb_dr_init();
> >  }
> >
> >  static void __init mx51_babbage_timer_init(void)
> >diff --git a/arch/arm/mach-mx5/usb_dr.c b/arch/arm/mach-mx5/usb_dr.c
> >new file mode 100644
> >index 0000000..52273ea
> >--- /dev/null
> >+++ b/arch/arm/mach-mx5/usb_dr.c
> >@@ -0,0 +1,57 @@
> >+/*
> >+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
> >+ *
> >+ * This program is free software; you can redistribute it and/or
> >+ * modify it under the terms of the GNU General Public License
> >+ * as published by the Free Software Foundation; either version 2
> >+ * of the License, or (at your option) any later version.
> >+ *
> >+ * This program is distributed in the hope that it will be useful,
> >+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >+ * GNU General Public License for more details.
> >+ *
> >+ * You should have received a copy of the GNU General Public License
> >+ * along with this program; if not, write to the Free Software
> >+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> >+ * MA 02110-1301, USA.
> >+ */
> >+
> >+#include<linux/platform_device.h>
> >+#include<mach/mxc_ehci.h>
> >+#include<mach/common.h>
> >+#include "devices.h"
> >+
> >+extern int usbotg_init(struct platform_device *pdev);
> >+extern int usbotg_uninit(struct platform_device *pdev);
> >+
> >+static int usbotg_init_ext(struct platform_device *pdev);
> >+static int usbotg_uninit_ext(struct platform_device *pdev);
> >+
> >+/*
> >+ * platform data structs
> >+ * 	- Which one to use is determined by CONFIG options in usb.h
> >+ * 	- operating_mode plugged at run time
> >+ */
> >+static struct mxc_usbh_platform_data dr_utmi_config = {
> >+	.init	= usbotg_init_ext,
> >+	.exit	= usbotg_uninit_ext,
> >+	.portsc	= MXC_EHCI_UTMI_16BIT,
> >+	.flags	= MXC_EHCI_INTERNAL_PHY,
> >+};
> >+
> >+/* Notes: configure USB clock*/
> >+static int usbotg_init_ext(struct platform_device *pdev)
> >+{
> >+	return usbotg_init(pdev);
> >+}
> >+
> >+static int usbotg_uninit_ext(struct platform_device *pdev)
> >+{
> >+	return usbotg_uninit(pdev);
> >+}
> >+
> >+void __init mx5_usb_dr_init(void)
> >+{
> >+	mxc_register_device(&mxc_usbdr_host_device,&dr_utmi_config);
> >+}
> 
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