clk: rockchip: protect critical clocks from getting disabled

The clock-tree contains clocks that should never get disabled automatically.
One example are the base ACLKs, the base supplies for all peripherals.

Therefore add a structure similar to the sunxi clock-tree to protect these
special clocks from being disabled.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Doug Anderson <dianders@chromium.org>
Tested-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index 5c9abd7bdc6a..d9c6db2151ba 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -296,3 +296,16 @@ void __init rockchip_clk_register_branches(
                 rockchip_clk_add_lookup(clk, list->id);
         }
 }
+
+void __init rockchip_clk_protect_critical(const char *clocks[], int nclocks)
+{
+        int i;
+
+        /* Protect the clocks that needs to stay on */
+        for (i = 0; i < nclocks; i++) {
+                struct clk *clk = __clk_lookup(clocks[i]);
+
+                if (clk)
+                        clk_prepare_enable(clk);
+        }
+}