linux-kernel - Re: [PATCH V3 0/4] ARM: tegra: Enable SLINK controller driver

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Date:	Tue, 30 Oct 2012 14:29:46 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	linux@....linux.org.uk, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 0/4] ARM: tegra: Enable SLINK controller driver

On 10/30/2012 01:05 AM, Laxman Dewangan wrote:
> This series modify the dts file to add the slink addresses,
> make AUXDATA in board dt files, enable slink4 for tegra30-cardhu and 
> enable slink controller defconfig.

This series only instantiates the SPI controller, and not any SPI
devices. I tried to solve this:

> diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
> index 700f0a3..3689853 100644
> --- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
> +++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
> @@ -278,6 +278,11 @@
>         spi@...0da00 {
>                 status = "okay";
>                 spi-max-frequency = <25000000>;
> +               flash@0 {
> +                       reg = <0>;
> +                       compatible = "atmel,at25df321a";
> +                       spi-max-frequency = <25000000>;
> +               };
>         };
>  
>         ahub {

However, this didn't work. Has the driver been tested? I'm seeing the
exact same problems I saw with the old driver, namely that the SPI flash
chip can't be identified; I think the ID bytes are read back as 0, and
hence drivers/mtd/devices/m25p80.c falls back to identifying the device
as mr25h256. Attempting to hexdump -C /dev/mtd0 gives me 32K of zeros,
whereas the device is 4M and full of non-zero data according to U-Boot.

Do you know what the problem is here? Can you please update the patch
series so that the SPI flash is instantiated and works correctly?
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