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tegra: fdt: Add function to return peripheral/clock ID

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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>
This commit is contained in:
Simon Glass 2012-03-06 17:10:27 +00:00 committed by Albert ARIBAUD
parent 9ab4ce223c
commit ed2974493e
2 changed files with 71 additions and 0 deletions
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58
arch/arm/cpu/armv7/tegra2/clock.c
View File

@ -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);

13
arch/arm/include/asm/arch-tegra2/clock.h
View File

@ -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
*