linux-kernel - Re: [RESEND PATCH v2 3/4] ARM: davinci: add aemif & nand support to da850-lcdk in legacy mode

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Message-ID: <CAMRc=MfU4xBcbOevviV9vo8Oq5mtGkcjv8zCEacZXB0twhxUuQ@mail.gmail.com>
Date:   Wed, 25 Apr 2018 11:14:51 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>
Cc:     Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [RESEND PATCH v2 3/4] ARM: davinci: add aemif & nand support to
 da850-lcdk in legacy mode

2018-04-17 16:09 GMT+02:00 Sekhar Nori <nsekhar@...com>:
> On Tuesday 17 April 2018 03:59 PM, Bartosz Golaszewski wrote:
>> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>
>> We now have support for aemif & nand from board files. As an example
>> add support for nand to da850-lcdk in legacy mode.
>
> Hawkboard is a separate board of its own, although closely related to
> LCDK. Lets refer to it as hawkboard itself, instead of "LCDK in legacy
> mode". So:
>
> ARM: davinci: omapl138-hawk: ...
>
>>
>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>> ---
>>  arch/arm/mach-davinci/board-omapl138-hawk.c | 132 ++++++++++++++++++++
>>  1 file changed, 132 insertions(+)
>>
>> diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
>> index 6c997c59a3cd..9c3de56b54e4 100644
>> --- a/arch/arm/mach-davinci/board-omapl138-hawk.c
>> +++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
>> @@ -16,6 +16,11 @@
>>  #include <linux/gpio.h>
>>  #include <linux/gpio/machine.h>
>>  #include <linux/platform_data/gpio-davinci.h>
>> +#include <linux/platform_data/ti-aemif.h>
>> +#include <linux/mtd/rawnand.h>
>> +#include <linux/mtd/partitions.h>
>> +#include <linux/platform_data/mtd-davinci.h>
>> +#include <linux/platform_data/mtd-davinci-aemif.h>
>>  #include <linux/regulator/machine.h>
>>
>>  #include <asm/mach-types.h>
>> @@ -162,6 +167,129 @@ static __init void omapl138_hawk_mmc_init(void)
>>       gpiod_remove_lookup_table(&mmc_gpios_table);
>>  }
>>
>> +static struct mtd_partition omapl138_hawk_nandflash_partition[] = {
>> +     {
>> +             .name           = "u-boot env",
>> +             .offset         = 0,
>> +             .size           = SZ_128K,
>> +             .mask_flags     = MTD_WRITEABLE,
>> +      },
>> +     {
>> +             .name           = "u-boot",
>> +             .offset         = MTDPART_OFS_APPEND,
>> +             .size           = SZ_128K,
>
> Can you make it 512K as it is in da850-lcdk.dts ?
>
>> +             .mask_flags     = MTD_WRITEABLE,
>> +     },
>> +     {
>> +             .name           = "free space",
>> +             .offset         = MTDPART_OFS_APPEND,
>> +             .size           = MTDPART_SIZ_FULL,
>> +             .mask_flags     = 0,
>> +     },
>> +};
>
>> +static struct aemif_abus_data omapl138_hawk_aemif_abus_data[] = {
>> +     {
>> +             .cs     = 3,
>> +     }
>> +};
>> +
>> +static struct platform_device omapl138_hawk_aemif_devices[] = {
>> +     {
>> +             .name           = "davinci_nand",
>> +             .id             = 1,
>
> Is there a reason for .id to be set to 1 here? Ideally it should be -1,
> I think since there is a single NAND on the board.
>

The davinci nand driver uses pdev->id as the chipselect number. I
guess this should be in the platform data. I'll send a patch for that.

> Note that I sent a patch dropping AEMIF clock acquisition from DaVinci
> NAND driver.
>
>> +             .dev            = {
>> +                     .platform_data  = &omapl138_hawk_nandflash_data,
>> +             },
>> +             .resource       = omapl138_hawk_nandflash_resource,
>> +             .num_resources  = ARRAY_SIZE(omapl138_hawk_nandflash_resource),
>> +             .id             = 0,
>
> This should have resulted in a double init warning?
>

It should, strange it didn't - at least for me.

Thanks,
Bart