linux-kernel - Re: [PATCH] extcon: palmas: add support for using VBUSDET output

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Message-id: <564EB332.5090406@samsung.com>
Date:	Fri, 20 Nov 2015 14:44:18 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Felipe Balbi <balbi@...com>, Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] extcon: palmas: add support for using VBUSDET output

Hi Felipe,

On 2015년 11월 20일 14:33, Chanwoo Choi wrote:
> Hi Felipe,
> 
> Looks good to me. But I have one comment.
> 
> On 2015년 11월 13일 02:57, Felipe Balbi wrote:
>> TPS659038 can remux its GPIO_1 as VBUSDET output,
>> which can be tied to a SoC GPIO and used as a VBUS
>> interrupt.
>>
>> Beagle X15 uses that, in fact, and without it, I
>> could not get USB peripheral working with that
>> board.
>>
>> Signed-off-by: Felipe Balbi <balbi@...com>
>> ---
>>  drivers/extcon/extcon-palmas.c | 22 ++++++++++++++++++++--
>>  1 file changed, 20 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
>> index 93c30a885740..7985d092c069 100644
>> --- a/drivers/extcon/extcon-palmas.c
>> +++ b/drivers/extcon/extcon-palmas.c
>> @@ -296,10 +296,28 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>  	}
>>  
>>  	if (palmas_usb->enable_vbus_detection) {
>> +		int irq = platform_get_irq(pdev, 0);
>> +
>> +		if (irq > 0) {
>> +			/* remux GPIO_1 as VBUSDET */
>> +			status = palmas_update_bits(palmas, PALMAS_PU_PD_OD_BASE,
>> +					PALMAS_PRIMARY_SECONDARY_PAD1,
>> +					PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
>> +					(1 << 3));
> 
> PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT is appropriate instead of using '3'.
> Also, I don't recommend the over line 80. The everything else is good
> 
> 
>> +			if (status < 0) {
>> +				dev_err(&pdev->dev, "can't remux GPIO1\n");
>> +				return status;
>> +			}
>> +
>> +			palmas_usb->vbus_irq = irq;
>> +		} else {
>> +			irq = regmap_irq_get_virq(palmas->irq_data,
>> +					PALMAS_VBUS_IRQ);
>> +			palmas_usb->vbus_irq = irq;
>> +		}
>> +
>>  		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
>>  						       PALMAS_VBUS_OTG_IRQ);
>> -		palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
>> -							   PALMAS_VBUS_IRQ);
>>  		status = devm_request_threaded_irq(palmas_usb->dev,
>>  				palmas_usb->vbus_irq, NULL,
>>  				palmas_vbus_irq_handler,
>>
> 
> Thanks,
> Chanwoo Choi
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> 

If you are OK about following patch, I'll apply it on extcon branch.

diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 93c30a885740..f601370c9466 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -296,10 +296,29 @@ static int palmas_usb_probe(struct platform_device *pdev)
 	}
 
 	if (palmas_usb->enable_vbus_detection) {
+		int irq = platform_get_irq(pdev, 0);
+
+		if (irq > 0) {
+			/* remux GPIO_1 as VBUSDET */
+			status = palmas_update_bits(palmas,
+				PALMAS_PU_PD_OD_BASE,
+				PALMAS_PRIMARY_SECONDARY_PAD1,
+				PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
+				(1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
+			if (status < 0) {
+				dev_err(&pdev->dev, "can't remux GPIO1\n");
+				return status;
+			}
+
+			palmas_usb->vbus_irq = irq;
+		} else {
+			irq = regmap_irq_get_virq(palmas->irq_data,
+					PALMAS_VBUS_IRQ);
+			palmas_usb->vbus_irq = irq;
+		}
+
 		palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
 						       PALMAS_VBUS_OTG_IRQ);
-		palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
-							   PALMAS_VBUS_IRQ);
 		status = devm_request_threaded_irq(palmas_usb->dev,
 				palmas_usb->vbus_irq, NULL,
 				palmas_vbus_irq_handler,
-- 
1.9.1


Thanks,
Chanwoo Choi

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