target/linux/brcm2708/patches-4.4/0348-clk-Allow-clocks-to-be-marked-as-CRITICAL.patch

   1 From ac9a9b1fcf3b0255aebc8e7f4b809f15556d9640 Mon Sep 17 00:00:00 2001
   2 From: Lee Jones <lee.jones@linaro.org>
   3 Date: Thu, 11 Feb 2016 13:19:09 -0800
   4 Subject: [PATCH 348/381] clk: Allow clocks to be marked as CRITICAL
   5
   6 Critical clocks are those which must not be gated, else undefined
   7 or catastrophic failure would occur.  Here we have chosen to
   8 ensure the prepare/enable counts are correctly incremented, so as
   9 not to confuse users with enabled clocks with no visible users.
  10
  11 Signed-off-by: Lee Jones <lee.jones@linaro.org>
  12 Signed-off-by: Michael Turquette <mturquette@baylibre.com>
  13 Link: lkml.kernel.org/r/1455225554-13267-2-git-send-email-mturquette@baylibre.com
  14 (cherry picked from commit 32b9b10961860860268961d9aad0c56a73018c37)
  15 ---
  16  drivers/clk/clk.c            | 5 +++++
  17  include/linux/clk-provider.h | 1 +
  18  2 files changed, 6 insertions(+)
  19
  20 --- a/drivers/clk/clk.c
  21 +++ b/drivers/clk/clk.c
  22 @@ -2466,6 +2466,11 @@ static int __clk_init(struct device *dev
  23         if (core->ops->init)
  24                 core->ops->init(core->hw);
  25
  26 +       if (core->flags & CLK_IS_CRITICAL) {
  27 +               clk_core_prepare(core);
  28 +               clk_core_enable(core);
  29 +       }
  30 +
  31         kref_init(&core->ref);
  32  out:
  33         clk_prepare_unlock();
  34 --- a/include/linux/clk-provider.h
  35 +++ b/include/linux/clk-provider.h
  36 @@ -31,6 +31,7 @@
  37  #define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */
  38  #define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */
  39  #define CLK_RECALC_NEW_RATES   BIT(9) /* recalc rates after notifications */
  40 +#define CLK_IS_CRITICAL                BIT(11) /* do not gate, ever */
  41
  42  struct clk;
  43  struct clk_hw;