Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757844Ab0FBL5A (ORCPT ); Wed, 2 Jun 2010 07:57:00 -0400 Received: from ozlabs.org ([203.10.76.45]:42331 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757705Ab0FBL46 (ORCPT ); Wed, 2 Jun 2010 07:56:58 -0400 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [RFC,PATCH 2/2] clk: Generic support for fixed-rate clocks Message-Id: <1275479804.138392.188759209099.2.gpush@pororo> In-Reply-To: <1275479804.137633.565764505843.0.gpush@pororo> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Ben Herrenchmidt From: Jeremy Kerr Date: Wed, 02 Jun 2010 19:56:44 +0800 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2477 Lines: 83 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 --- 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 f70137a..009ca73 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -112,6 +112,19 @@ 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_operations clk_fixed_operations; + +#define DEFINE_CLK_FIXED(r) { \ + .clk = DEFINE_CLK(clk_fixed_operations), \ + .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 , the -fno-omit-frame-pointer is diff --git a/kernel/clk.c b/kernel/clk.c new file mode 100644 index 0000000..353736c --- /dev/null +++ b/kernel/clk.c @@ -0,0 +1,25 @@ +/* + * Copyright (C) 2010 Canonical Ltd + * + * 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 +#include + +#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_operations clk_fixed_operations = { + .get_rate = clk_fixed_get_rate, +}; + +EXPORT_SYMBOL_GPL(clk_fixed_operations); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/