[U-Boot] [PATCH 10/20] tegra: clock: Support enabling external clocks

[Simon Glass]

Add a simple function to enable external clocks.

Signed-off-by: Simon Glass <sjg at 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_ */
-- 
2.2.0.rc0.207.ga3a616c