There is no way to set additional flags for a DT-initialized fixed- factor-clock, and it can be problematic i.e., when the clock rate needs to be changed. [1][2]
This patch introduces an optional dt-binding named "clock-flags" to be used for passing any needed flags from dts. [1] http://www.spinics.net/lists/linux-clk/msg09040.html [2] https://lkml.org/lkml/2016/6/20/1025 Changes since v1: - fix possible build failure when using gcc-5 or gcc-6 Signed-off-by: Jongsung Kim <neidhard....@lge.com> Cc: Maxime Ripard <maxime.rip...@free-electrons.com> Cc: Mike Turquette <mturque...@baylibre.com> Cc: Stephen Boyd <sb...@codeaurora.org> --- .../bindings/clock/fixed-factor-clock.txt | 4 ++++ drivers/clk/clk-fixed-factor.c | 4 +++- include/dt-bindings/clk/clk.h | 22 ++++++++++++++++++++++ 3 files changed, 29 insertions(+), 1 deletion(-) create mode 100644 include/dt-bindings/clk/clk.h diff --git a/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt b/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt index 1bae8527..3e1b79e 100644 --- a/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt +++ b/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt @@ -13,12 +13,16 @@ Required properties: Optional properties: - clock-output-names : From common clock binding. +- clock-flags : Additional flags to be used. Example: + #include <dt-bindings/clk/clk.h> + clock { compatible = "fixed-factor-clock"; clocks = <&parentclk>; #clock-cells = <0>; clock-div = <2>; clock-mult = <1>; + clock-flags = <CLK_SET_RATE_PARENT>; }; diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c index 75cd6c7..e626cad 100644 --- a/drivers/clk/clk-fixed-factor.c +++ b/drivers/clk/clk-fixed-factor.c @@ -150,6 +150,7 @@ void __init of_fixed_factor_clk_setup(struct device_node *node) struct clk *clk; const char *clk_name = node->name; const char *parent_name; + u32 flags = 0; u32 div, mult; if (of_property_read_u32(node, "clock-div", &div)) { @@ -166,8 +167,9 @@ 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); + of_property_read_u32(node, "clock-flags", &flags); - clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0, + clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags, mult, div); if (!IS_ERR(clk)) of_clk_add_provider(node, of_clk_src_simple_get, clk); diff --git a/include/dt-bindings/clk/clk.h b/include/dt-bindings/clk/clk.h new file mode 100644 index 0000000..1834933 --- /dev/null +++ b/include/dt-bindings/clk/clk.h @@ -0,0 +1,22 @@ +/* + * See include/linux/clk-provider.h for more information. + */ + +#ifndef __DT_BINDINGS_CLK_CLK_H +#define __DT_BINDINGS_CLK_CLK_H + +#define BIT(nr) (1UL << (nr)) + +#define CLK_SET_RATE_GATE BIT(0) +#define CLK_SET_PARENT_GATE BIT(1) +#define CLK_SET_RATE_PARENT BIT(2) +#define CLK_IGNORE_UNUSED BIT(3) +#define CLK_IS_BASIC BIT(5) +#define CLK_GET_RATE_NOCACHE BIT(6) +#define CLK_SET_RATE_NO_REPARENT BIT(7) +#define CLK_GET_ACCURACY_NOCACHE BIT(8) +#define CLK_RECALC_NEW_RATES BIT(9) +#define CLK_SET_RATE_UNGATE BIT(10) +#define CLK_IS_CRITICAL BIT(11) + +#endif -- 2.7.4
