Grant, Rob, et al., As background, consider an SoC with 4 SD/MMC controllers, and that most boards will only use 1 or 2 of these controllers. Attempting to initialize the other would be pointless since nothing is connected, cause meaningless kernel error spew, etc. This could be handled in two ways: 1) For all such devices, place status="disabled" in $soc.dtsi, and override this in $board.dts for the devices that are actually used on the board. 2) Do nothing in particular in $soc.dtsi, thus leaving everything enabled, and disable anything unused in $board.dts. We've had this discussion before, and if I understood you (Grant) correctly, you stated during review of some Tegra .dts files that (2) was the de-facto practice, and hence that's what the current Tegra .dts files in the kernel do. However, I've just noticed that we aren't consistent about this across SoCs; IMX and Atmel appear to do (1) whereas Tegra and Exynos do (2). (1) seems a little more direct; the $board.dts files only contain configuration for devices they use, rather than also having to disable devices they don't. Can Tegra (and Exynos) switch? Thanks. -- nvpublic -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
