linux-kernel - Re: [PATCH 3/9] ARM: davinci: da850-evm: use aemif platform driver in legacy mode

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Date:   Mon, 25 Jun 2018 11:04:20 -0500
From:   David Lechner <david@...hnology.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 3/9] ARM: davinci: da850-evm: use aemif platform driver in
 legacy mode

On 06/25/2018 10:29 AM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> 
> We now support board files in the aemif driver. Register a platform
> device instead of using the handcrafted API in da850-evm.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>   arch/arm/mach-davinci/board-da850-evm.c | 93 ++++++++++++++-----------
>   1 file changed, 51 insertions(+), 42 deletions(-)
> 
> diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
> index 442c16773f09..0ae7c47ed2b0 100644
> --- a/arch/arm/mach-davinci/board-da850-evm.c
> +++ b/arch/arm/mach-davinci/board-da850-evm.c
> @@ -33,6 +33,7 @@
>   #include <linux/platform_data/gpio-davinci.h>
>   #include <linux/platform_data/mtd-davinci.h>
>   #include <linux/platform_data/mtd-davinci-aemif.h>
> +#include <linux/platform_data/ti-aemif.h>

alphabetical order would be after spi-davinci.h

>   #include <linux/platform_data/spi-davinci.h>
>   #include <linux/platform_data/uio_pruss.h>
>   #include <linux/regulator/machine.h>


> @@ -266,37 +257,58 @@ static struct resource da850_evm_nandflash_resource[] = {
>   	},
>   };
>   
> -static struct platform_device da850_evm_nandflash_device = {
> -	.name		= "davinci_nand",
> -	.id		= 1,
> -	.dev		= {
> -		.platform_data	= &da850_evm_nandflash_data,
> -	},
> -	.num_resources	= ARRAY_SIZE(da850_evm_nandflash_resource),
> -	.resource	= da850_evm_nandflash_resource,
> +static struct resource da850_evm_aemif_resource[] = {
> +	{
> +		.start	= DA8XX_AEMIF_CTL_BASE,
> +		.end	= DA8XX_AEMIF_CTL_BASE + SZ_32K,
> +		.flags	= IORESOURCE_MEM,
> +	}
>   };
>   
> -static struct platform_device *da850_evm_devices[] = {
> -	&da850_evm_nandflash_device,
> -	&da850_evm_norflash_device,
> +static struct aemif_abus_data da850_evm_aemif_abus_data[] = {
> +	{
> +		.cs	= 3,
> +	}
>   };
>   
> -#define DA8XX_AEMIF_CE2CFG_OFFSET	0x10
> -#define DA8XX_AEMIF_ASIZE_16BIT		0x1
> -
> -static void __init da850_evm_init_nor(void)
> -{
> -	void __iomem *aemif_addr;
> -
> -	aemif_addr = ioremap(DA8XX_AEMIF_CTL_BASE, SZ_32K);
> +static struct platform_device da850_evm_aemif_devices[] = {
> +	{
> +		.name		= "davinci_nand",
> +		.id		= 1,

The existing clock lookup is for "davinci_nand.0". Might need to
change id here.

> +		.dev		= {
> +			.platform_data	= &da850_evm_nandflash_data,
> +		},
> +		.num_resources	= ARRAY_SIZE(da850_evm_nandflash_resource),
> +		.resource	= da850_evm_nandflash_resource,
> +	},
> +	{
> +		.name		= "physmap-flash",
> +		.id		= 0,
> +		.dev		= {
> +			.platform_data  = &da850_evm_norflash_data,
> +		},
> +		.num_resources	= 1,
> +		.resource	= da850_evm_norflash_resource,
> +	}
> +};
>   
> -	/* Configure data bus width of CS2 to 16 bit */
> -	writel(readl(aemif_addr + DA8XX_AEMIF_CE2CFG_OFFSET) |
> -		DA8XX_AEMIF_ASIZE_16BIT,
> -		aemif_addr + DA8XX_AEMIF_CE2CFG_OFFSET);
> +static struct aemif_platform_data da850_evm_aemif_pdata = {
> +	.cs_offset = 2,
> +	.abus_data = da850_evm_aemif_abus_data,
> +	.num_abus_data = ARRAY_SIZE(da850_evm_aemif_abus_data),
> +	.sub_devices = da850_evm_aemif_devices,
> +	.num_sub_devices = ARRAY_SIZE(da850_evm_aemif_devices),
> +};
>   
> -	iounmap(aemif_addr);
> -}
> +static struct platform_device da850_evm_aemif_device = {
> +	.name		= "ti-aemif",
> +	.dev = {
> +		.platform_data	= &da850_evm_aemif_pdata,
> +	},
> +	.resource	= da850_evm_aemif_resource,
> +	.num_resources	= ARRAY_SIZE(da850_evm_aemif_resource),
> +	.id		= -1,
> +};
>   
>   static const short da850_evm_nand_pins[] = {
>   	DA850_EMA_D_0, DA850_EMA_D_1, DA850_EMA_D_2, DA850_EMA_D_3,