Re: [PATCH V3 0/4] ARM: tegra: Enable SLINK controller driver
From: Stephen Warren <hidden>
Date: 2012-10-30 20:29:51
Also in:
linux-arm-kernel, lkml
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:
quoted hunk ↗ jump to hunk
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@7000da00 { 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?