[3.13.y-ckt stable] Patch "clk: zynq: Force CPU_2X clock to be ungated" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Mar 31 18:45:41 UTC 2015

This is a note to let you know that I have just added a patch titled

    clk: zynq: Force CPU_2X clock to be ungated

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.13.11-ckt18.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see



>From 22a9769fdfb3bc69bf4847ec60a47f508b6417a9 Mon Sep 17 00:00:00 2001
From: Soren Brinkmann <soren.brinkmann at xilinx.com>
Date: Tue, 27 Jan 2015 11:05:27 -0800
Subject: clk: zynq: Force CPU_2X clock to be ungated

commit 3dccfecdb867fe35b305a4e493ef5652b7d9d4cb upstream.

The CPU_2X clock does not have a classical in-kernel user, but is,
amongst other things, required for OCM and debug access. Make sure this
clock is not mistakenly disabled during boot up by enabling it in the
platform's clock driver.

Fixes: 0ee52b157b8e 'clk: zynq: Add clock controller driver'
Signed-off-by: Soren Brinkmann <soren.brinkmann at xilinx.com>
Signed-off-by: Michael Turquette <mturquette at linaro.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/clk/zynq/clkc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clk/zynq/clkc.c b/drivers/clk/zynq/clkc.c
index 10772aa..e7cf8aa 100644
--- a/drivers/clk/zynq/clkc.c
+++ b/drivers/clk/zynq/clkc.c
@@ -290,6 +290,7 @@ static void __init zynq_clk_setup(struct device_node *np)
 	clks[cpu_2x] = clk_register_gate(NULL, clk_output_name[cpu_2x],
 			26, 0, &armclk_lock);
+	clk_prepare_enable(clks[cpu_2x]);

 	clk = clk_register_fixed_factor(NULL, "cpu_1x_div", "cpu_div", 0, 1,
 			4 + 2 * tmp);

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