From e58a4a79b9b83d9afa66c0e2cc7490ca40a193bf Mon Sep 17 00:00:00 2001 From: Lee Jones Date: Thu, 11 Feb 2016 13:19:09 -0800 Subject: [PATCH] clk: Allow clocks to be marked as CRITICAL Critical clocks are those which must not be gated, else undefined or catastrophic failure would occur. Here we have chosen to ensure the prepare/enable counts are correctly incremented, so as not to confuse users with enabled clocks with no visible users. Signed-off-by: Lee Jones Signed-off-by: Michael Turquette Link: lkml.kernel.org/r/1455225554-13267-2-git-send-email-mturquette@baylibre.com (cherry picked from commit 32b9b10961860860268961d9aad0c56a73018c37) --- drivers/clk/clk.c | 5 +++++ include/linux/clk-provider.h | 1 + 2 files changed, 6 insertions(+) --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2466,6 +2466,11 @@ static int __clk_init(struct device *dev if (core->ops->init) core->ops->init(core->hw); + if (core->flags & CLK_IS_CRITICAL) { + clk_core_prepare(core); + clk_core_enable(core); + } + kref_init(&core->ref); out: clk_prepare_unlock(); --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -31,6 +31,7 @@ #define CLK_SET_RATE_NO_REPARENT BIT(7) /* don't re-parent on rate change */ #define CLK_GET_ACCURACY_NOCACHE BIT(8) /* do not use the cached clk accuracy */ #define CLK_RECALC_NEW_RATES BIT(9) /* recalc rates after notifications */ +#define CLK_IS_CRITICAL BIT(11) /* do not gate, ever */ struct clk; struct clk_hw;