[PATCH V3 4/8] clk: core: support clocks which requires parents enable (part 2)
From: Stephen Boyd <hidden>
Date: 2016-07-02 00:55:48
Also in:
linux-clk, lkml
On 06/30, Dong Aisheng wrote:
On Freescale i.MX7D platform, all clocks operations, including enable/disable, rate change and re-parent, requires its parent clock on. Current clock core can not support it well. This patch adding flag CLK_OPS_PARENT_ENABLE to handle this special case in clock core that enable its parent clock firstly for each operation and disable it later after operation complete. The patch part 2 fixes set clock rate and set parent while its parent is off. The most special case is for set_parent() operation which requires all parents including both old and new one to be enabled at the same time during the operation. Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <redacted> Cc: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> ---
Applied to clk-next
quoted hunk ↗ jump to hunk
@@ -1502,6 +1514,9 @@ static void clk_change_rate(struct clk_core *core) trace_clk_set_rate(core, core->new_rate); + if (core->flags & CLK_OPS_PARENT_ENABLE) + clk_core_prepare_enable(parent); +
I swapped this with trace_clk_set_rate() so the tracepoint is closer to the hw operation.
if (!skip_set_rate && core->ops->set_rate) core->ops->set_rate(core->hw, core->new_rate, best_parent_rate);
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