Add a simple function to enable external clocks.
Signed-off-by: Simon Glass sjg@chromium.org ---
arch/arm/cpu/tegra-common/clock.c | 17 +++++++++++++++++ arch/arm/include/asm/arch-tegra/clock.h | 8 ++++++++ 2 files changed, 25 insertions(+)
diff --git a/arch/arm/cpu/tegra-common/clock.c b/arch/arm/cpu/tegra-common/clock.c index 0d36b02..5d53444 100644 --- a/arch/arm/cpu/tegra-common/clock.c +++ b/arch/arm/cpu/tegra-common/clock.c @@ -17,10 +17,12 @@ /* Tegra SoC common clock control functions */
#include <common.h> +#include <errno.h> #include <asm/io.h> #include <asm/arch/clock.h> #include <asm/arch/tegra.h> #include <asm/arch-tegra/clk_rst.h> +#include <asm/arch-tegra/pmc.h> #include <asm/arch-tegra/timer.h> #include <div64.h> #include <fdtdec.h> @@ -698,3 +700,18 @@ void tegra30_set_up_pllp(void)
set_avp_clock_source(SCLK_SOURCE_PLLP_OUT4); } + +int clock_external_output(int clk_id) +{ + struct pmc_ctlr *pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE; + + if (clk_id >= 1 && clk_id <= 3) { + setbits_le32(&pmc->pmc_clk_out_cntrl, + 1 << (2 + (clk_id - 1) * 8)); + } else { + printf("%s: Unknown output clock id %d\n", __func__, clk_id); + return -EINVAL; + } + + return 0; +} diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h index 04011ae..f9dd3c8 100644 --- a/arch/arm/include/asm/arch-tegra/clock.h +++ b/arch/arm/include/asm/arch-tegra/clock.h @@ -336,4 +336,12 @@ void arch_timer_init(void);
void tegra30_set_up_pllp(void);
+/** + * Enable output clock for external peripherals + * + * @param clk_id Clock ID to output (1, 2 or 3) + * @return 0 if OK. -ve on error + */ +int clock_external_output(int clk_id); + #endif /* _TEGRA_CLOCK_H_ */