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* [PATCH v8 15/21] tegra: fdt: Add function to return peripheral/clock ID
@ 2012-03-07  3:10 Simon Glass
       [not found] ` <1331089833-25262-16-git-send-email-sjg-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
  0 siblings, 1 reply; 6+ messages in thread
From: Simon Glass @ 2012-03-07  3:10 UTC (permalink / raw)
  To: U-Boot Mailing List
  Cc: Stephen Warren, Devicetree Discuss, Jerry Van Baren, Tom Warren,
	linux-tegra

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>
---
Changes in v4:
- Add fdtdec function to return peripheral ID

Changes in v6:
- Move peripheral decode function into Tegra's clock.c

Changes in v7:
- Add belts and braces checking of device tree clock ID

Changes in v8:
- Only include clock_decode_periph_id() when CONFIG_OF_CONTROL defined

 arch/arm/cpu/armv7/tegra2/clock.c        |   58 ++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-tegra2/clock.h |   13 +++++++
 2 files changed, 71 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv7/tegra2/clock.c b/arch/arm/cpu/armv7/tegra2/clock.c
index 11d2346..a94cf81 100644
--- a/arch/arm/cpu/armv7/tegra2/clock.c
+++ b/arch/arm/cpu/armv7/tegra2/clock.c
@@ -28,6 +28,7 @@
 #include <asm/arch/tegra2.h>
 #include <common.h>
 #include <div64.h>
+#include <fdtdec.h>
 
 /*
  * This is our record of the current clock rate of each clock. We don't
@@ -918,6 +919,63 @@ void clock_ll_start_uart(enum periph_id periph_id)
 	reset_set_enable(periph_id, 0);
 }
 
+#ifdef CONFIG_OF_CONTROL
+/*
+ * Convert a device tree clock ID to our peripheral ID. They are mostly
+ * the same but we are very cautious so we check that a valid clock ID is
+ * provided.
+ *
+ * @param clk_id	Clock ID according to tegra2 device tree binding
+ * @return peripheral ID, or PERIPH_ID_NONE if the clock ID is invalid
+ */
+static enum periph_id clk_id_to_periph_id(int clk_id)
+{
+	if (clk_id > 95)
+		return PERIPH_ID_NONE;
+
+	switch (clk_id) {
+	case 1:
+	case 2:
+	case 7:
+	case 10:
+	case 20:
+	case 30:
+	case 35:
+	case 49:
+	case 56:
+	case 74:
+	case 76:
+	case 77:
+	case 78:
+	case 79:
+	case 80:
+	case 81:
+	case 82:
+	case 83:
+	case 91:
+	case 95:
+		return PERIPH_ID_NONE;
+	default:
+		return clk_id;
+	}
+}
+
+int clock_decode_periph_id(const void *blob, int node)
+{
+	enum periph_id id;
+	u32 cell[2];
+	int err;
+
+	err = fdtdec_get_int_array(blob, node, "clocks", cell,
+				   ARRAY_SIZE(cell));
+	if (err)
+		return -1;
+	id = clk_id_to_periph_id(cell[1]);
+	assert(clock_periph_id_isvalid(id));
+	return id;
+}
+#endif /* CONFIG_OF_CONTROL */
+
 int clock_verify(void)
 {
 	struct clk_pll *pll = get_pll(CLOCK_ID_PERIPH);
diff --git a/arch/arm/include/asm/arch-tegra2/clock.h b/arch/arm/include/asm/arch-tegra2/clock.h
index 080ef18..6b12c76 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
  *
-- 
1.7.7.3

^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-03-07 18:18 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2012-03-07  3:10 [PATCH v8 15/21] tegra: fdt: Add function to return peripheral/clock ID Simon Glass
     [not found] ` <1331089833-25262-16-git-send-email-sjg-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2012-03-07  3:10   ` [PATCH v8 21/21] tegra: fdt: Enable FDT support for Ventana Simon Glass
     [not found]     ` <1331089833-25262-22-git-send-email-sjg-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2012-03-07 17:10       ` Stephen Warren
     [not found]         ` <4F579697.4050108-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-03-07 17:14           ` Simon Glass
     [not found]             ` <CAPnjgZ0CF2Ytoj35MvdpEJa-g7JozG2U7xtQjPEGM4+p_ehtwA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-03-07 18:18               ` Tom Warren
2012-03-07 17:09   ` [PATCH v8 15/21] tegra: fdt: Add function to return peripheral/clock ID Stephen Warren

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