[RFC,PATCH 2/2] clk: Generic support for fixed-rate clocks
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From: Jeremy Kerr on 4 Jun 2010 03:40 Since most platforms will need a fixed-rate clock, add one. This will also serve as a basic example of an implementation of struct clk. Signed-off-by: Jeremy Kerr <jeremy.kerr(a)canonical.com> --- include/linux/clk.h | 13 +++++++++++++ kernel/Makefile | 1 + kernel/clk.c | 25 +++++++++++++++++++++++++ 3 files changed, 39 insertions(+) diff --git a/include/linux/clk.h b/include/linux/clk.h index bb6957a..6269b44 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -123,6 +123,19 @@ static inline struct clk *clk_get_parent(struct clk *clk) return ERR_PTR(-ENOSYS); } +/* Simple fixed-rate clock */ +struct clk_fixed { + struct clk clk; + unsigned long rate; +}; + +extern struct clk_ops clk_fixed_ops; + +#define INIT_CLK_FIXED(name, r) { \ + .clk = INIT_CLK(name.clk, clk_fixed_ops), \ + .rate = (r) \ +} + #else /* !CONFIG_USE_COMMON_STRUCT_CLK */ /* diff --git a/kernel/Makefile b/kernel/Makefile index 057472f..1ae15aa 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -105,6 +105,7 @@ obj-$(CONFIG_PERF_EVENTS) += perf_event.o obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o obj-$(CONFIG_PADATA) += padata.o +obj-$(CONFIG_USE_COMMON_STRUCT_CLK) += clk.o ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y) # According to Alan Modra <alan(a)linuxcare.com.au>, the -fno-omit-frame-pointer is diff --git a/kernel/clk.c b/kernel/clk.c new file mode 100644 index 0000000..85c0670 --- /dev/null +++ b/kernel/clk.c @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2010 Canonical Ltd <jeremy.kerr(a)canonical.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Standard functionality for the common clock API. + */ + +#include <linux/module.h> +#include <linux/clk.h> + +#define to_clk_fixed(clk) (container_of(clk, struct clk_fixed, clk)) + +static unsigned long clk_fixed_get_rate(struct clk *clk) +{ + return to_clk_fixed(clk)->rate; +} + +struct clk_ops clk_fixed_ops = { + .get_rate = clk_fixed_get_rate, +}; + +EXPORT_SYMBOL_GPL(clk_fixed_ops); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |