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tegra: i2c: Add function to find DVC bus

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Add tegra_i2c_get_dvc_bus_num() to obtain the I2C bus number of DVC bus.
This allows us to talk to the PMU.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass 2012-04-02 13:19:01 +00:00 • committed by Albert ARIBAUD
parent 1f47efa87a
commit e31c1e50ac
2 changed files with 21 additions and 0 deletions
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7
arch/arm/include/asm/arch-tegra2/tegra_i2c.h
View file

@ -154,4 +154,11 @@ struct i2c_ctlr {
#define I2C_INT_ARBITRATION_LOST_SHIFT 2 #define I2C_INT_ARBITRATION_LOST_SHIFT 2
#define I2C_INT_ARBITRATION_LOST_MASK (1 << I2C_INT_ARBITRATION_LOST_SHIFT) #define I2C_INT_ARBITRATION_LOST_MASK (1 << I2C_INT_ARBITRATION_LOST_SHIFT)
/**
* Returns the bus number of the DVC controller
*
* @return number of bus, or -1 if there is no DVC active
*/
int tegra_i2c_get_dvc_bus_num(void);
#endif #endif

14
drivers/i2c/tegra_i2c.c
View file

@ -567,3 +567,17 @@ int i2c_set_bus_num(unsigned int bus)
return 0; return 0;
} }
#endif #endif
int tegra_i2c_get_dvc_bus_num(void)
{
int i;
for (i = 0; i < CONFIG_SYS_MAX_I2C_BUS; i++) {
struct i2c_bus *bus = &i2c_controllers[i];
if (bus->inited && bus->is_dvc)
return i;
}
return -1;
}