linux-kernel - Re: [PATCH v6] Enable USB peripheral mode on dm365 EVM

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Date:	Wed, 10 Oct 2012 21:35:35 +0200
From:	Constantine Shulyupin <const@...elinux.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	nsekhar@...com, gregkh@...uxfoundation.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	balbi@...com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6] Enable USB peripheral mode on dm365 EVM

Sekhar Nori: Looks like all PHY related configuration is currently happening in
drivers/usb/musb/davinci.c and the same register is also being written
to for other platforms. Can you move the code you have included in board
file to the driver? As we move towards DT, we need to avoid register
configurations from board files anyway.

>From http://www.spinics.net/lists/kernel/msg1414914.html

On Wed, Oct 10, 2012 at 9:27 PM, Sergei Shtylyov <sshtylyov@...sta.com> wrote:
> Hello.
>
>
> On 10-10-2012 14:33, Constantine Shulyupin wrote:
>
>> From: Constantine Shulyupin <const@...eLinux.com>
>>
>> Sets USB PHY clock source to 24 MHz clock and call USB configuration from
>> board initialization.
>>
>> Tested with OTG configuration, usb gadget g_zero on DM365 EVM connected to
>> PC.
>>
>> References:
>>
>> Definition of USB_PHY_CTRL and PHYCLKFREQ:
>> - http://www.makelinux.com/lib/ti/DM36x_ARM/doc-141
>>
>> Original patch by miguel.aguilar@...gerun.com three years ago:
>> -
>> http://www.mail-archive.com/davinci-linux-open-source@linux.davincidsp.com/msg14741.html
>>
>> Signed-off-by: Constantine Shulyupin <const@...eLinux.com>
>> ---
>>
>> Note:
>>
>> Changelog
>>
>> Changes since v5 http://www.spinics.net/lists/kernel/msg1413120.html
>> accordingy feedback of nsekhar@...com
>> http://www.spinics.net/lists/kernel/msg1414914.html
>> - phy configuration moved to drivers/usb/musb/davinci.c
>> - USB_OTG configuration is submitted in separated patch:
>> http://www.spinics.net/lists/kernel/msg1414964.html
>> - Setting current limit to 1000 mA. Any way the current is limited to 510
>> mA in davinci_setup_usb.
>>
>> Changes since v4 http://www.spinics.net/lists/kernel/msg1412995.html
>> - removed fix of dev_info in musb_init_controller
>>
>> Changes since v3 http://www.spinics.net/lists/kernel/msg1412544.html:
>> - removed optional altering of pr_info
>>
>> Changes since v1  http://marc.info/?l=linux-kernel&m=130894150803661&w=2:
>> - removed optional code and reordered
>> - removed alternation of GPIO33, which is multiplexed with DRVVBUS,
>> because is not need for peripheral USB
>>
>> This patch is based on code from projects Arago, Angstom and RidgeRun.
>>
>> ---
>>   arch/arm/mach-davinci/board-dm365-evm.c |    2 ++
>>   drivers/usb/musb/davinci.c              |    3 +++
>>   drivers/usb/musb/davinci.h              |    1 +
>>   3 files changed, 6 insertions(+)
>>
>> diff --git a/arch/arm/mach-davinci/board-dm365-evm.c
>> b/arch/arm/mach-davinci/board-dm365-evm.c
>> index 688a9c5..ba5ffc1 100644
>> --- a/arch/arm/mach-davinci/board-dm365-evm.c
>> +++ b/arch/arm/mach-davinci/board-dm365-evm.c
>> @@ -38,6 +38,7 @@
>>   #include <mach/mmc.h>
>>   #include <mach/nand.h>
>>   #include <mach/keyscan.h>
>> +#include <mach/usb.h>
>>     #include <media/tvp514x.h>
>>   @@ -610,6 +611,7 @@ static __init void dm365_evm_init(void)
>>         dm365_init_spi0(BIT(0), dm365_evm_spi_info,
>>                         ARRAY_SIZE(dm365_evm_spi_info));
>> +       davinci_setup_usb(1000, 8);
>>   }
>>     MACHINE_START(DAVINCI_DM365_EVM, "DaVinci DM365 EVM")
>
>
>     You need to split the patch at this point. Above part should be applied
> to the DaVinci tree, below part to the MUSB tree.
>
>
>> diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c
>> index 472c8b4..af09ebf 100644
>> --- a/drivers/usb/musb/davinci.c
>> +++ b/drivers/usb/musb/davinci.c
>> @@ -428,6 +428,9 @@ static int davinci_musb_init(struct musb *musb)
>>                 __raw_writel(deepsleep, DM355_DEEPSLEEP);
>>         }
>>   +     if (machine_is_davinci_dm365_evm())
>> +               writel(readl(USB_PHY_CTRL) | USBPHY_CLKFREQ_24MHZ,
>> USB_PHY_CTRL);
>
>
>     I'd put that to the board file instead, like in board-da830-evm.c....
>
> WBR, Sergei
>



-- 
Constantine Shulyupin
http://www.MakeLinux.com/
Embedded Linux Systems,
Device Drivers, TI DaVinci
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