1 From 08accfd44328954d33c264402730c1944f1c70fc Mon Sep 17 00:00:00 2001
2 From: Eric Anholt <eric@anholt.net>
3 Date: Mon, 9 May 2016 17:28:18 -0700
4 Subject: [PATCH 029/454] clk: bcm2835: Mark GPIO clocks enabled at boot as
7 These divide off of PLLD_PER and are used for the ethernet and wifi
8 PHYs source PLLs. Neither of them is currently represented by a phy
9 device that would grab the clock for us.
11 This keeps other drivers from killing the networking PHYs when they
12 disable their own clocks and trigger PLLD_PER's refcount going to 0.
14 v2: Skip marking as critical if they aren't on at boot.
16 Signed-off-by: Eric Anholt <eric@anholt.net>
18 drivers/clk/bcm/clk-bcm2835.c | 9 +++++++++
19 1 file changed, 9 insertions(+)
21 --- a/drivers/clk/bcm/clk-bcm2835.c
22 +++ b/drivers/clk/bcm/clk-bcm2835.c
23 @@ -1490,6 +1490,15 @@ static struct clk_hw *bcm2835_register_c
24 init.flags = data->flags | CLK_IGNORE_UNUSED;
27 + * Some GPIO clocks for ethernet/wifi PLLs are marked as
28 + * critical (since some platforms use them), but if the
29 + * firmware didn't have them turned on then they clearly
30 + * aren't actually critical.
32 + if ((cprman_read(cprman, data->ctl_reg) & CM_ENABLE) == 0)
33 + init.flags &= ~CLK_IS_CRITICAL;
36 * Pass the CLK_SET_RATE_PARENT flag if we are allowed to propagate
37 * rate changes on at least of the parents.