2013/6/21 Lubomir Popov <lpo...@mm-sol.com>:
> Hi Axel,
>
> On 21/06/13 06:07, Axel Lin wrote:
>> AM33XX has 4 gpio banks, thus the valid gpio range should be 0 ... 127.
>>
>> Signed-off-by: Axel Lin <axel....@ingics.com>
>> ---
>> v2: define OMAP_MAX_GPIO and use it.
>> This change is mainly based on Stefan's comment, however I use
>> OMAP_MAX_GPIO instead of CONFIG_OMAP_MAX_GPIO because having CONFIG_ prefix
>> seems meaning it can be configurable in configs.
>>
>> drivers/gpio/omap_gpio.c | 8 +++++++-
>> 1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpio/omap_gpio.c b/drivers/gpio/omap_gpio.c
>> index a30d7f0..6fa57c9 100644
>> --- a/drivers/gpio/omap_gpio.c
>> +++ b/drivers/gpio/omap_gpio.c
>> @@ -40,6 +40,12 @@
>> #include <asm/io.h>
>> #include <asm/errno.h>
>>
>> +#if defined(CONFIG_AM33XX)
>> +#define OMAP_MAX_GPIO 128
>> +#else
>> +#define OMAP_MAX_GPIO 192
>> +#endif
>
> Please be aware that OMAP54XX and DRA7XX SoCs have 8 banks per 32 GPIOs,
> that is, 256 in total. The DRA7xx config defines CONFIG_DRA7XX, but also
> includes omap5_common.h, where CONFIG_OMAP54XX is defined (due to sharing
> of many internal IPs with the OMAP5, including GPIO). The above definitions
> should be changed to something like:
>
> #if defined(CONFIG_OMAP54XX)
> #define OMAP_MAX_GPIO 256 /* OMAP54XX and DRA7XX */
In arch/arm/cpu/armv7/omap5/hwinit.c
we have below settings:
static struct gpio_bank gpio_bank_54xx[6] = {
{ (void *)OMAP54XX_GPIO1_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP54XX_GPIO2_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP54XX_GPIO3_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP54XX_GPIO4_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP54XX_GPIO5_BASE, METHOD_GPIO_24XX },
{ (void *)OMAP54XX_GPIO6_BASE, METHOD_GPIO_24XX },
};
const struct gpio_bank *const omap_gpio_bank = gpio_bank_54xx;
So gpio_bank_54xx only has 6 entries rather than 8 entries.
Seems need to fix this before setting OMAP_MAX_GPIO to 256.
I'm wondering if it's ok to have this patch as is, and then an incremental
patch to set gpio_bank_54xx[] and OMAP_MAX_GPIO for
OMAP54XX and DRA7XX.
Regards,
Axel
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