linux-kernel - [PATCH] clk: rockchip: add initcall to set clk defaults after syscons are available

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 07 Aug 2014 14:57:38 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] clk: rockchip: add initcall to set clk defaults after syscons are available

PLLs on Rockchip platforms report their locking state in an external
register situated in the "General Register Files" which is provided
through a syscon device.

When the initial clk init runs, this syscon is of course not yet
available, making it impossible to set PLLs to other frequencies
through the assigned-rate property of the clock-controller node.

Syscon devices are initialized through a postcore initcall, so add an
arch_initcall to rerun the rockchip specific clock initalization when
the GRF is available.

As the clock init already runs two times (through of_clk_add_provider
and of_clk_init), a third time shouldn't hurt to much and in the best
case wouldn't change any settings at all.

Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 drivers/clk/rockchip/clk.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index 9a3adb1..e14b108 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
+#include <linux/clk/clk-conf.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include "clk.h"
@@ -126,6 +127,18 @@ void __init rockchip_clk_init(struct device_node *np, void __iomem *base,
 	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 }

+/**
+ * Set clock-defaults again, after grf regmap is available for PLLs.
+ */
+static int __init rockchip_clk_set_defaults(void)
+{
+	if (cru_node)
+		return of_clk_set_defaults(cru_node, true);
+
+	return 0;
+}
+arch_initcall(rockchip_clk_set_defaults);
+
 struct regmap *rockchip_clk_get_grf(void)
 {
 	if (IS_ERR(grf))
-- 
2.0.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/