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mmc: tegra: add basic Tegra186 support

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Tegra186's MMC controller needs to be explicitly identified. Add another
compatible value for it.

Tegra186 will use an entirely different clock/reset control mechanism to
existing chips, and will use standard clock/reset APIs rather than the
existing Tegra-specific custom APIs. The driver support for that isn't
ready yet, so simply disable all clock/reset usage if compiling for
Tegra186. This must happen at compile time rather than run-time since the
custom APIs won't even be compiled in on Tegra186. In the long term, the
plan would be to convert the existing custom APIs to standard APIs and get
rid of the ifdefs completely.

The system's main eMMC will work without any clock/reset support, since
the firmware will have already initialized the controller in order to
load U-Boot. Hence the driver is useful even in this apparently crippled
state.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Stephen Warren
2016-05-12 12:11:23 -06:00
committed by Tom Warren
parent 074a1fdd27
commit 39f633320c
4 changed files with 35 additions and 1 deletions
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2
arch/arm/include/asm/arch-tegra/tegra_mmc.h
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@@ -134,7 +134,9 @@ struct mmc_host {
int id; /* device id/number, 0-3 */
int enabled; /* 1 to enable, 0 to disable */
int width; /* Bus Width, 1, 4 or 8 */
#ifndef CONFIG_TEGRA186
enum periph_id mmc_id; /* Peripheral ID: PERIPH_ID_... */
#endif
struct gpio_desc cd_gpio; /* Change Detect GPIO */
struct gpio_desc pwr_gpio; /* Power GPIO */
struct gpio_desc wp_gpio; /* Write Protect GPIO */