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List:       linux-omap
Subject:    Re: [PATCH] twl4030: Fix boot with twl4030 usb transceiver enabled
From:       Tony Lindgren <tony () atomide ! com>
Date:       2009-09-30 17:30:41
Message-ID: 20090930173040.GM16865 () atomide ! com
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* Roger Quadros <ext-roger.quadros@nokia.com> [090930 08:48]:
> The usb regulator supplies (usb1v5, usb1v8 & usb3v1) must be available
> before adding the twl4030_usb child, else twl4030_usb_ldo_init() will
> always fail thus causing boot lock-up.
> 
> This patch fixes boot on OMAP systems using the twl4030 usb transceiver.
> CONFIG_TWL4030_USB=y

This fix should go to Samuel for integration:

$ grep -a4 drivers/mfd MAINTAINERS 
MULTIFUNCTION DEVICES (MFD)
M:      Samuel Ortiz <sameo@linux.intel.com>
T:      git git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6.git
S:      Supported
F:      drivers/mfd/
...

Regards,

Tony


 
> Signed-off-by: Roger Quadros <ext-roger.quadros@nokia.com>
> ---
>  drivers/mfd/twl4030-core.c |  112 ++++++++++++++++++--------------------------
>  1 files changed, 46 insertions(+), 66 deletions(-)
> 
> diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
> index e424cf6..dcd27be 100644
> --- a/drivers/mfd/twl4030-core.c
> +++ b/drivers/mfd/twl4030-core.c
> @@ -480,7 +480,6 @@ static int
>  add_children(struct twl4030_platform_data *pdata, unsigned long features)
>  {
>  	struct device	*child;
> -	struct device	*usb_transceiver = NULL;
>  
>  	if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
>  		child = add_child(3, "twl4030_bci",
> @@ -532,16 +531,61 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
>  	}
>  
>  	if (twl_has_usb() && pdata->usb) {
> +
> +		static struct regulator_consumer_supply usb1v5 = {
> +			.supply =	"usb1v5",
> +		};
> +		static struct regulator_consumer_supply usb1v8 = {
> +			.supply =	"usb1v8",
> +		};
> +		static struct regulator_consumer_supply usb3v1 = {
> +			.supply =	"usb3v1",
> +		};
> +
> +	/* First add the regulators so that they can be used by transceiver */
> +		if (twl_has_regulator()) {
> +			/* this is a template that gets copied */
> +			struct regulator_init_data usb_fixed = {
> +				.constraints.valid_modes_mask =
> +					REGULATOR_MODE_NORMAL
> +					| REGULATOR_MODE_STANDBY,
> +				.constraints.valid_ops_mask =
> +					REGULATOR_CHANGE_MODE
> +					| REGULATOR_CHANGE_STATUS,
> +			};
> +
> +			child = add_regulator_linked(TWL4030_REG_VUSB1V5,
> +						      &usb_fixed, &usb1v5, 1);
> +			if (IS_ERR(child))
> +				return PTR_ERR(child);
> +
> +			child = add_regulator_linked(TWL4030_REG_VUSB1V8,
> +						      &usb_fixed, &usb1v8, 1);
> +			if (IS_ERR(child))
> +				return PTR_ERR(child);
> +
> +			child = add_regulator_linked(TWL4030_REG_VUSB3V1,
> +						      &usb_fixed, &usb3v1, 1);
> +			if (IS_ERR(child))
> +				return PTR_ERR(child);
> +
> +		}
> +
>  		child = add_child(0, "twl4030_usb",
>  				pdata->usb, sizeof(*pdata->usb),
>  				true,
>  				/* irq0 = USB_PRES, irq1 = USB */
>  				pdata->irq_base + 8 + 2, pdata->irq_base + 4);
> +
>  		if (IS_ERR(child))
>  			return PTR_ERR(child);
>  
>  		/* we need to connect regulators to this transceiver */
> -		usb_transceiver = child;
> +		if (twl_has_regulator() && child) {
> +			usb1v5.dev = child;
> +			usb1v8.dev = child;
> +			usb3v1.dev = child;
> +		}
>  	}
>  
>  	if (twl_has_watchdog()) {
> @@ -557,70 +601,6 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
>  			return PTR_ERR(child);
>  	}
>  
> -	if (twl_has_regulator()) {
> -		/*
> -		child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -		*/
> -
> -		child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -
> -		child = add_regulator(TWL4030_REG_VDAC, pdata->vdac);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -
> -		child = add_regulator((features & TWL4030_VAUX2)
> -					? TWL4030_REG_VAUX2_4030
> -					: TWL4030_REG_VAUX2,
> -				pdata->vaux2);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -	}
> -
> -	if (twl_has_regulator() && usb_transceiver) {
> -		static struct regulator_consumer_supply usb1v5 = {
> -			.supply =	"usb1v5",
> -		};
> -		static struct regulator_consumer_supply usb1v8 = {
> -			.supply =	"usb1v8",
> -		};
> -		static struct regulator_consumer_supply usb3v1 = {
> -			.supply =	"usb3v1",
> -		};
> -
> -		/* this is a template that gets copied */
> -		struct regulator_init_data usb_fixed = {
> -			.constraints.valid_modes_mask =
> -				  REGULATOR_MODE_NORMAL
> -				| REGULATOR_MODE_STANDBY,
> -			.constraints.valid_ops_mask =
> -				  REGULATOR_CHANGE_MODE
> -				| REGULATOR_CHANGE_STATUS,
> -		};
> -
> -		usb1v5.dev = usb_transceiver;
> -		usb1v8.dev = usb_transceiver;
> -		usb3v1.dev = usb_transceiver;
> -
> -		child = add_regulator_linked(TWL4030_REG_VUSB1V5, &usb_fixed,
> -				&usb1v5, 1);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -
> -		child = add_regulator_linked(TWL4030_REG_VUSB1V8, &usb_fixed,
> -				&usb1v8, 1);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -
> -		child = add_regulator_linked(TWL4030_REG_VUSB3V1, &usb_fixed,
> -				&usb3v1, 1);
> -		if (IS_ERR(child))
> -			return PTR_ERR(child);
> -	}
> -
>  	/* maybe add LDOs that are omitted on cost-reduced parts */
>  	if (twl_has_regulator() && !(features & TPS_SUBSET)) {
>  		child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2);
> -- 
> 1.6.0.4
> 
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