clk: rockchip: reparent aclk_cpu_pre to the gpll
From: Heiko Stuebner <heiko@...> Date: Thu, 4 Sep 2014 21:24:45 +0200
Commit-Message
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@...>
Patch-Comment
drivers/clk/rockchip/clk-rk3188.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
Statistics
- 21 lines added
- 0 lines removed
Changes
---------------------- drivers/clk/rockchip/clk-rk3188.c -----------------------
index 1c5e644..6a81bc9 100644
@@ -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);