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authorSimon Glass <sjg@chromium.org>2012-03-06 17:10:27 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-03-29 08:12:48 +0200
commited2974493e838399eacd4bf88f38b215955688a8 (patch)
tree8eccb7124c36adb71f53ccdb5ec44bf30a787790 /arch/arm/include/asm/arch-tegra2/clock.h
parent9ab4ce223c1d991e92e15c9aa0f522d61072155d (diff)
tegra: fdt: Add function to return peripheral/clock ID
A common requirement is to find the clock ID for a peripheral. This is the second cell of the 'clocks' property (the first being the phandle itself). Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
Diffstat (limited to 'arch/arm/include/asm/arch-tegra2/clock.h')
-rw-r--r--arch/arm/include/asm/arch-tegra2/clock.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/include/asm/arch-tegra2/clock.h b/arch/arm/include/asm/arch-tegra2/clock.h
index 080ef18e81..6b12c76e8d 100644
--- a/arch/arm/include/asm/arch-tegra2/clock.h
+++ b/arch/arm/include/asm/arch-tegra2/clock.h
@@ -177,6 +177,7 @@ enum periph_id {
PERIPH_ID_CRAM2,
PERIPH_ID_COUNT,
+ PERIPH_ID_NONE = -1,
};
/* Converts a clock number to a clock register: 0=L, 1=H, 2=U */
@@ -355,6 +356,18 @@ unsigned clock_get_rate(enum clock_id clkid);
*/
void clock_ll_start_uart(enum periph_id periph_id);
+/**
+ * Decode a peripheral ID from a device tree node.
+ *
+ * This works by looking up the peripheral's 'clocks' node and reading out
+ * the second cell, which is the clock number / peripheral ID.
+ *
+ * @param blob FDT blob to use
+ * @param node Node to look at
+ * @return peripheral ID, or PERIPH_ID_NONE if none
+ */
+enum periph_id clock_decode_periph_id(const void *blob, int node);
+
/*
* Checks that clocks are valid and prints a warning if not
*