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

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Date:	Thu, 25 Oct 2012 10:06:53 +0300
From:	Felipe Balbi <balbi@...com>
To:	Constantine Shulyupin <const@...eLinux.com>
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

Hi,

On Wed, Oct 10, 2012 at 02:33:32PM +0200, 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")
> 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);

no such checks in drivers. Please find another way to do this.

-- 
balbi

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