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: <df39067d-a941-4099-2cfe-7602d4047c6f@ti.com>
Date:   Tue, 17 Apr 2018 19:39:00 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Santosh Shilimkar <ssantosh@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <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

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.

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?

Thanks,
Sekhar