diff options
| -rw-r--r-- | arch/arm/include/asm/arch-tegra/clock.h | 13 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/clock.c | 23 |
2 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h index 2270501406..61ef81e7fe 100644 --- a/arch/arm/include/asm/arch-tegra/clock.h +++ b/arch/arm/include/asm/arch-tegra/clock.h @@ -271,6 +271,19 @@ void clock_ll_start_uart(enum periph_id periph_id); int clock_decode_periph_id(struct udevice *dev); /** + * Get periph clock id and its parent from device tree. + * + * This works by looking up the peripheral's 'clocks' node and reading out + * the second and fourth cells, which are the peripheral and PLL clock numbers. + * + * @param dev udevice associated with FDT node + * @param clk_id pointer to int array of 2 values + * first is periph clock, second is + * its PLL parent according to FDT. + */ +int clock_decode_pair(struct udevice *dev, int *clk_id); + +/** * Checks if the oscillator bypass is enabled (XOBP bit) * * Return: 1 if bypass is enabled, 0 if not diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index 11bffc1701..966009f375 100644 --- a/arch/arm/mach-tegra/clock.c +++ b/arch/arm/mach-tegra/clock.c @@ -678,6 +678,29 @@ int clock_decode_periph_id(struct udevice *dev) assert(clock_periph_id_isvalid(id)); return id; } + +/* + * Get periph clock id and its parent from device tree. + * + * @param dev udevice associated with FDT node + * @param clk_id pointer to u32 array of 2 values + * first is periph clock, second is + * its PLL parent according to FDT. + */ +int clock_decode_pair(struct udevice *dev, int *clk_id) +{ + u32 cell[4]; + int err; + + err = dev_read_u32_array(dev, "clocks", cell, ARRAY_SIZE(cell)); + if (err) + return -EINVAL; + + clk_id[0] = clk_id_to_periph_id(cell[1]); + clk_id[1] = clk_id_to_pll_id(cell[3]); + + return 0; +} #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */ int clock_verify(void) |