openwrt/target/linux/brcm2708/patches-4.4/0345-clk-bcm2835-Mark-the-VPU-clock-as-critical.patch

From 9f73459ac27903bb52d831db29cb70a95189fdba Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Tue, 26 Apr 2016 11:44:59 -0700
Subject: [PATCH] clk: bcm2835: Mark the VPU clock as critical

The VPU clock is also the clock for our AXI bus, so we really can't
disable it.  This might have happened during boot if, for example,
uart1 (aux_uart clock) probed and was then disabled before the other
consumers of the VPU clock had probed.

v2: Rewrite to use a .flags in bcm2835_clock_data, since other clocks
    will need this too.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 drivers/clk/bcm/clk-bcm2835.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -446,6 +446,8 @@ struct bcm2835_clock_data {
 	/* Number of fractional bits in the divider */
 	u32 frac_bits;
 
+	u32 flags;
+
 	bool is_vpu_clock;
 	bool is_mash_clock;
 };
@@ -1242,7 +1244,7 @@ static struct clk *bcm2835_register_cloc
 	init.parent_names = parents;
 	init.num_parents = data->num_mux_parents;
 	init.name = data->name;
-	init.flags = CLK_IGNORE_UNUSED;
+	init.flags = data->flags | CLK_IGNORE_UNUSED;
 
 	if (data->is_vpu_clock) {
 		init.ops = &bcm2835_vpu_clock_clk_ops;
@@ -1661,6 +1663,7 @@ static const struct bcm2835_clk_desc clk
 		.div_reg = CM_VPUDIV,
 		.int_bits = 12,
 		.frac_bits = 8,
+		.flags = CLK_IS_CRITICAL,
 		.is_vpu_clock = true),
 
 	/* clocks with per parent mux */