Re: [PATCH 01/20] clk: fixed-factor: Pass clk rates change to the parent
From: Michael Turquette <hidden>
Date: 2016-06-17 23:05:33
Also in:
dri-devel, linux-arm-kernel, linux-clk
Quoting Maxime Ripard (2016-05-16 05:47:01)
A fixed factor clock, if it needs to change its rate, by definition do not have any choice but to modify its parent rate.
Logically it makes sense to always propagate the rate-change request up to the parent for a fixed-factor clock if we desire to change its rate. However, I wonder if doing this for all users of fixed-factor-clock in DT is safe? Some users may be counting on it not changing. There are 397 instances of fixed-factor-clock in .dts[i] today, so this change worries me a bit.
quoted hunk
Add the CLK_SET_RATE_PARENT flag to that clock so that it can happen Signed-off-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> --- drivers/clk/clk-fixed-factor.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c index 75cd6c792cb8..3363abd9b4ae 100644 --- a/drivers/clk/clk-fixed-factor.c +++ b/drivers/clk/clk-fixed-factor.c@@ -167,7 +167,8 @@ void __init of_fixed_factor_clk_setup(struct device_node *node) of_property_read_string(node, "clock-output-names", &clk_name); parent_name = of_clk_get_parent_name(node, 0); - clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0, + clk = clk_register_fixed_factor(NULL, clk_name, parent_name, + CLK_SET_RATE_PARENT,
An alternative would be to pass in the flags you want, somehow. For the clock you are trying to fix, is it inside of the SoC or external? If it is internal, and part of a larger clock controller driver, is this for the legacy style allwinner clock drivers that put everything in DT? If not, it would better to initialize it statically and shove this flag into the struct clk_init_data storage. Regards, Mike
mult, div);
if (!IS_ERR(clk))
of_clk_add_provider(node, of_clk_src_simple_get, clk);
--
2.8.2-- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html