From 79ef35a9443588e782a8da9bd96a2af47c10a226 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 5 May 2023 13:25:28 +0200 Subject: [PATCH] clk: imx: busy: Add a determine_rate hook The iMX busy clock implements a mux with a set_parent hook, but doesn't provide a determine_rate implementation. This is a bit odd, since set_parent() is there to, as its name implies, change the parent of a clock. However, the most likely candidates to trigger that parent change are either the assigned-clock-parents device tree property or a call to clk_set_rate(), with determine_rate() figuring out which parent is the best suited for a given rate. The other trigger would be a call to clk_set_parent(), but it's far less used, and it doesn't look like there's any obvious user for that clock. Similarly, it doesn't look like the device tree using that clock driver uses any of the assigned-clock properties on that clock. So, the set_parent hook is effectively unused, possibly because of an oversight. However, it could also be an explicit decision by the original author to avoid any reparenting but through an explicit call to clk_set_parent(). The latter case would be equivalent to setting the determine_rate implementation to clk_hw_determine_rate_no_reparent(). Indeed, if no determine_rate implementation is provided, clk_round_rate() (through clk_core_round_rate_nolock()) will call itself on the parent if CLK_SET_RATE_PARENT is set, and will not change the clock rate otherwise. And if it was an oversight, then we are at least explicit about our behavior now and it can be further refined down the line. Cc: Abel Vesa Cc: Fabio Estevam Cc: Peng Fan Cc: Sascha Hauer Cc: Shawn Guo Cc: linux-arm-kernel@lists.infradead.org Cc: NXP Linux Team Cc: Pengutronix Kernel Team Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v4-26-971d5077e7d2@cerno.tech Signed-off-by: Stephen Boyd --- drivers/clk/imx/clk-busy.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/clk/imx/clk-busy.c b/drivers/clk/imx/clk-busy.c index 6f17311..f163df9 100644 --- a/drivers/clk/imx/clk-busy.c +++ b/drivers/clk/imx/clk-busy.c @@ -148,6 +148,7 @@ static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index) } static const struct clk_ops clk_busy_mux_ops = { + .determine_rate = clk_hw_determine_rate_no_reparent, .get_parent = clk_busy_mux_get_parent, .set_parent = clk_busy_mux_set_parent, }; -- 2.7.4