linux-kernel - Re: [PATCH 2/2] gpio: davinci: reuse for Keystone SoC

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Message-ID: <52AF4031.7000205@ti.com>
Date:	Mon, 16 Dec 2013 20:02:25 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Sekhar Nori <nsekhar@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	<prabhakar.csengg@...il.com>, <linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2] gpio: davinci: reuse for Keystone SoC

On 12/16/2013 06:38 PM, Santosh Shilimkar wrote:
> On Thursday 12 December 2013 01:12 PM, Grygorii Strashko wrote:
>> The similar GPIO HW block is used by keystone SoCs as
>> in Davinci SoCs.
>> Hence, reuse Davinci GPIO driver for Keystone taking into
>> account that Keystone contains ARM GIC IRQ controller which
>> is implemented using IRQ Chip.
>>
>> Documentation:
>> 	http://www.ti.com/lit/ug/sprugv1/sprugv1.pdf
>>
>> CC: Linus Walleij <linus.walleij@...aro.org>
>> CC: Sekhar Nori <nsekhar@...com>
>> CC: Santosh Shilimkar <santosh.shilimkar@...com>
>> CC: devicetree@...r.kernel.org
>>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
>>   .../devicetree/bindings/gpio/gpio-davinci.txt      |    4 +-
>>   drivers/gpio/gpio-davinci.c                        |   49 +++++++++++++++-----
>>   2 files changed, 40 insertions(+), 13 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
>> index a2e839d..4ce9862 100644
>> --- a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
>> +++ b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
>> @@ -1,7 +1,7 @@
>> -Davinci GPIO controller bindings
>> +Davinci/Keystone GPIO controller bindings
>>
>>   Required Properties:
>> -- compatible: should be "ti,dm6441-gpio"
>> +- compatible: should be "ti,dm6441-gpio", "ti,keystone-gpio"
>>
>>   - reg: Physical base address of the controller and the size of memory mapped
>>          registers.
>> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
>> index 73f65ca..3e44e0c 100644
>> --- a/drivers/gpio/gpio-davinci.c
>> +++ b/drivers/gpio/gpio-davinci.c
>> @@ -413,6 +413,27 @@ static const struct irq_domain_ops davinci_gpio_irq_ops = {
>>   	.xlate = irq_domain_xlate_onetwocell,
>>   };
>>
>> +static struct irq_chip *davinci_gpio_get_irq_chip(unsigned int irq)
>> +{
>> +	static struct irq_chip_type gpio_unbanked;
>> +
>> +	gpio_unbanked = *container_of(irq_get_chip(irq),
>> +				      struct irq_chip_type, chip);
>> +
>> +	return &gpio_unbanked.chip;
>> +};
>> +
>> +static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq)
>> +{
>> +	static struct irq_chip gpio_unbanked;
>> +
>> +	gpio_unbanked = *irq_get_chip(irq);
>> +	pr_err("keystone_gpio_get_irq_chip\n");
>> +	return &gpio_unbanked;
>> +};
>> +
>> +static const struct of_device_id davinci_gpio_ids[];
>> +
>>   /*
>>    * NOTE:  for suspend/resume, probably best to make a platform_device with
>>    * suspend_late/resume_resume calls hooking into results of the set_wake()
>> @@ -433,6 +454,15 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
>>   	struct davinci_gpio_platform_data *pdata = dev->platform_data;
>>   	struct davinci_gpio_regs __iomem *g;
>>   	struct irq_domain	*irq_domain = NULL;
>> +	const struct of_device_id *match;
>> +	struct irq_chip *irq_chip;
>> +	struct irq_chip *(*gpio_get_irq_chip)(unsigned int irq);
>> +
>> +	gpio_get_irq_chip = davinci_gpio_get_irq_chip;
>> +	match = of_match_device(of_match_ptr(davinci_gpio_ids),
>> +				dev);
>> +	if (match)
>> +		gpio_get_irq_chip = match->data;
> and if the DT node is not populated ?
>>
>>   	ngpio = pdata->ngpio;
>>   	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>> @@ -442,7 +472,6 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
>>   	}
>>
>>   	bank_irq = res->start;
>> -
> stray change..
>
>>   	if (!bank_irq) {
>>   		dev_err(dev, "Invalid IRQ resource\n");
>>   		return -ENODEV;
>> @@ -484,25 +513,22 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
>>   	}
>>
>>   	/*
>> -	 * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO
>> +	 * INTC can handle direct/unbanked IRQs for GPIOs, with the GPIO
> So you want to have a generic name here. If you are changing it, change it
> across the driver in a separate patch or leave it as is...
> I don't think it matters much..

Uh. Ok. I'll drop renaming.


>
> With those comments addressed, you can add my ack.
> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
>

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