Re: [PATCH V2 1/2] mcx: very basic support for HTKW mcx board

[Igor Grinberg <grinberg@compulab.co.il>]

On 12/15/11 02:53, Ilya Yanok wrote:
> Very basic support for HTKW mcx board. Able to boot via board-generic
> and ramdisk/initramfs, however most of peripherals is unsupported.
> Produces tons of twl4030 related errors as this board doesn't have
> twl4030 installed.
> 
> Signed-off-by: Ilya Yanok <yanok@emcraft.com>
> 
> ---
> Changes from V1:
> 
>  - device tree moved to the separate patch
>  - iva node is disabled instead of using custom includes
>  - removed bootargs entry
> 
>  arch/arm/boot/dts/mcx.dts |   27 +++++++++++++++++++++++++++
>  1 files changed, 27 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/boot/dts/mcx.dts
> 
> diff --git a/arch/arm/boot/dts/mcx.dts b/arch/arm/boot/dts/mcx.dts
> new file mode 100644
> index 0000000..66b81bd
> --- /dev/null
> +++ b/arch/arm/boot/dts/mcx.dts
> @@ -0,0 +1,27 @@
> +/*
> + * Copyright (C) 2011 Ilya Yanok, EmCraft Systems
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +/dts-v1/;
> +
> +/include/ "omap3.dtsi"
> +
> +/ {
> +	model = "HTKW mcx";
> +	compatible = "htkw,mcx", "ti,omap3";
> +
> +	memory {
> +		device_type = "memory";
> +		reg = <0x80000000 0x10000000>; /* 256 MB */
> +	};
> +
> +	/* AM35xx doesn't have IVA */
> +	soc {
> +		iva {
> +			status = "disabled";
> +		};
> +	};

I don't get it...
Why SoCs that do not have those IP blocks should poke
their configuration inside the h/w description
(e.g. disable/enable/workaround/hack)?
This way, why don't we also disable the PCIe which this SoC does not have?
Of course, I'm exaggerating, but this just does not scale...
Soon you will have a bunch of boards disabling stuff,
that they *do not have natively*...
Why don't generic OMAP3 DT file disable the EMAC?
If we will go this way, we will find ourself fixing it later
and producing the renaming/moving "churn", won't we?

-- 
Regards,
Igor.