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clk: bcm2835: Limit PCM clock to OSC and PLLD_PER 

Restrict clock sources for the PCM peripheral to the oscillator and
PLLD_PER because other source may have varying rates or be switched off.
Prevent other sources from being selected by replacing their names in
the list of potential parents with dummy entries (entry index is
significant).

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Acked-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Phil Elwell 2017-06-01 15:14:16 +01:00 committed by Stephen Boyd
parent e45098d703
commit 8c0de581c4
1 changed files with 26 additions and 1 deletions
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27
drivers/clk/bcm/clk-bcm2835.c
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@ -1518,6 +1518,31 @@ static const char *const bcm2835_clock_per_parents[] = {
.parents = bcm2835_clock_per_parents, \
__VA_ARGS__)
/*
* Restrict clock sources for the PCM peripheral to the oscillator and
* PLLD_PER because other source may have varying rates or be switched
* off.
*
* Prevent other sources from being selected by replacing their names in
* the list of potential parents with dummy entries (entry index is
* significant).
*/
static const char *const bcm2835_pcm_per_parents[] = {
"-",
"xosc",
"-",
"-",
"-",
"-",
"plld_per",
"-",
};
#define REGISTER_PCM_CLK(...) REGISTER_CLK( \
.num_mux_parents = ARRAY_SIZE(bcm2835_pcm_per_parents), \
.parents = bcm2835_pcm_per_parents, \
__VA_ARGS__)
/* main vpu parent mux */
static const char *const bcm2835_clock_vpu_parents[] = {
"gnd",
@ -1995,7 +2020,7 @@ static const struct bcm2835_clk_desc clk_desc_array[] = {
.int_bits = 4,
.frac_bits = 8,
.tcnt_mux = 22),
[BCM2835_CLOCK_PCM] = REGISTER_PER_CLK(
[BCM2835_CLOCK_PCM] = REGISTER_PCM_CLK(
.name = "pcm",
.ctl_reg = CM_PCMCTL,
.div_reg = CM_PCMDIV,