clk: rockchip: reparent aclk_cpu_pre to the gpll

aclk_cpu_pre on the rk3188 can either be sourced from the armclk or the gpll.
To reduce complexity on apll changes caused by cpufreq, reparent it always
to the gpll source.

If really necessary it could be reparented back on a per board level using
the assigned-clocks mechanism.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/clk-rk3188.c b/drivers/clk/rockchip/clk-rk3188.c
index 1c5e6442dcfb..6a81bc9e54f0 100644
--- a/drivers/clk/rockchip/clk-rk3188.c
+++ b/drivers/clk/rockchip/clk-rk3188.c
@@ -652,12 +652,33 @@ CLK_OF_DECLARE(rk3066a_cru, "rockchip,rk3066a-cru", rk3066a_clk_init);
 
 static void __init rk3188a_clk_init(struct device_node *np)
 {
+	struct clk *clk1, *clk2;
+	unsigned long rate;
+	int ret;
+
 	rk3188_common_clk_init(np);
 	rockchip_clk_register_plls(rk3188_pll_clks,
 				   ARRAY_SIZE(rk3188_pll_clks),
 				   RK3188_GRF_SOC_STATUS);
 	rockchip_clk_register_branches(rk3188_clk_branches,
 				  ARRAY_SIZE(rk3188_clk_branches));
+
+	/* reparent aclk_cpu_pre from apll */
+	clk1 = __clk_lookup("aclk_cpu_pre");
+	clk2 = __clk_lookup("gpll");
+	if (clk1 && clk2) {
+		rate = clk_get_rate(clk1);
+
+		ret = clk_set_parent(clk1, clk2);
+		if (ret < 0)
+			pr_warn("%s: could not reparent aclk_cpu_pre to gpll\n",
+				__func__);
+
+		clk_set_rate(clk1, rate);
+	} else {
+		pr_warn("%s: missing clocks to reparent aclk_cpu_pre to gpll\n",
+			__func__);
+	}
 }
 CLK_OF_DECLARE(rk3188a_cru, "rockchip,rk3188a-cru", rk3188a_clk_init);