linux-kernel - Re: [PATCH v2 2/2] gpio: davinci: reuse for Keystone SoC

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Date:	Mon, 23 Dec 2013 15:35:56 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Sekhar Nori <nsekhar@...com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>
CC:	Rob Herring <rob.herring@...xeda.com>,
	<prabhakar.csengg@...il.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-gpio@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] gpio: davinci: reuse for Keystone SoC

On 12/22/2013 05:41 PM, Sekhar Nori wrote:
> On Wednesday 18 December 2013 03:37 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: Alexandre Courbot <gnurou@...il.com>
>> Cc: Sekhar Nori <nsekhar@...com>
>> Cc: devicetree@...r.kernel.org
>>
>> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>> ---
>>   .../devicetree/bindings/gpio/gpio-davinci.txt      |    4 +-
>>   drivers/gpio/gpio-davinci.c                        |   46 ++++++++++++++++----
>>   2 files changed, 40 insertions(+), 10 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 1b33806..38741cc 100644
>> --- a/drivers/gpio/gpio-davinci.c
>> +++ b/drivers/gpio/gpio-davinci.c
>> @@ -413,6 +413,26 @@ 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);
>> +	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 +453,18 @@ 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);
>> +
>> +	/*
>> +	 * Use davinci_gpio_get_irq_chip by default to handle non DT cases
>> +	 */
>> +	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;
>
> This produces a sparse warning:
>
>    CHECK   drivers/gpio/gpio-davinci.c
> drivers/gpio/gpio-davinci.c:467:35: warning: incorrect type in assignment (different modifiers)
> drivers/gpio/gpio-davinci.c:467:35:    expected struct irq_chip *( *[assigned] gpio_get_irq_chip )( ... )
> drivers/gpio/gpio-davinci.c:467:35:    got void const *const data
>

I'll fix it, thanks.

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