tegra: clock: Support enabling external clocks

Add a simple function to enable external clocks.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h
index 04011ae25585aff7f13e2b763b943a11571aeafc..f9dd3c817d13efb76de90fafbb7aa9e78d9326ea 100644 (file)
--- 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_ */

diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index cdd54388c520d574dd73a69a15730091a65f0282..590826072b8a27161fe2554db8783c6a38841e42 100644 (file)
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -17,11 +17,13 @@
 /* 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/ap.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>
@@ -702,3 +704,18 @@ 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;
+}