[U-Boot] [PATCH v2 1/7] Tegra30: Add arch-tegra30 include files

[Stephen Warren <swarren@wwwdotorg.org>]

On 12/03/2012 04:45 PM, Tom Warren wrote:
> Common Tegra files are in arch-tegra, shared between T20 and T30.
> Tegra30-specific headers are in arch-tegra30. Note that some of
> these will be filled in as more T30 support is added (drivers,
> WB/LP0 support, etc.). A couple of Tegra20 files were changed
> to support common headers in arch-tegra, also.

> diff --git a/arch/arm/include/asm/arch-tegra/tegra.h b/arch/arm/include/asm/arch-tegra/tegra.h

> +/*
> + * These are used to distinguish SOC types for setting up clocks. Mostly
> + * we can tell the clocking required by looking at the SOC sku_id, but
> + * for T30 it is a user option as to whether to run PLLP in fast or slow
> + * mode, so we have two options there.
> + */
>  enum {
>  	TEGRA_SOC_T20,
>  	TEGRA_SOC_T25,
> +	TEGRA_SOC_T30,
> +	TEGRA_SOC_T30_408MHZ,   /* A T30 with faster PLLP */
> +	TEGRA_SOC2_SLOW,	/* T2x needs to run at slow clock initially */
>  
> -	TEGRA_SOC_COUNT,
> +	TEGRA_SOC_CNT,
>  	TEGRA_SOC_UNKNOWN	= -1,
>  };

Can you remind me why TEGRA_SOC_T30_408MHZ exists; isn't it a SW thing
whereas this enum is meant to be identifying the HW?

> diff --git a/arch/arm/include/asm/arch-tegra30/funcmux.h b/arch/arm/include/asm/arch-tegra30/funcmux.h

> +/* Configs supported by the func mux */
> +enum {
> +	FUNCMUX_DEFAULT = 0,	/* default config */
> +
> +	/* UART configs */
> +	FUNCMUX_UART1_ULPI = 0,

funcmux isn't going to be remotely useful for Tegra30. There are
something like 460 possible ways of muxing out (IIRC) just a 4-pin UART
A on Tegra30. That's why when I was defining the proposed ODMDATA2
representation of UART pinmux for the Tegra30 BCT, I didn't have a
single enum covering the entire UART configuration, but rather a 4-bit
field per signal (RXD, TXD, RTS, CTS) that indicated which of the
possible pins to route it to.

Still, I guess having the initial port use funcmux is fine since we only
need to support 1 option for now. We'll hopefully just convert it to use
the BCT ODMDATA2 format rather quickly.

A similar comment will probably apply to any other peripheral on Tegra30.