Re: [PATCH v2 3/7] clk: Add fixed-rate clock

[Shawn Guo <shawn.guo@freescale.com>]

On Thu, Sep 22, 2011 at 03:26:58PM -0700, Mike Turquette wrote:
> From: Jeremy Kerr <jeremy.kerr@canonical.com>
> 
> Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
> Signed-off-by: Mike Turquette <mturquette@ti.com>
> ---
> Changes since v1:
> Add copyright header
> 
>  drivers/clk/Kconfig     |    4 ++++
>  drivers/clk/Makefile    |    1 +
>  drivers/clk/clk-fixed.c |   24 ++++++++++++++++++++++++
>  include/linux/clk.h     |   14 ++++++++++++++
>  4 files changed, 43 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/clk/clk-fixed.c
> 
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index c53ed59..d8313d7 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -8,3 +8,7 @@ config HAVE_MACH_CLKDEV
>  
>  config GENERIC_CLK
>  	bool
> +
> +config GENERIC_CLK_FIXED
> +	bool
> +	depends on GENERIC_CLK
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index 570d5b9..9a3325a 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -1,3 +1,4 @@
>  
>  obj-$(CONFIG_CLKDEV_LOOKUP)	+= clkdev.o
>  obj-$(CONFIG_GENERIC_CLK)	+= clk.o
> +obj-$(CONFIG_GENERIC_CLK_FIXED)	+= clk-fixed.o
> diff --git a/drivers/clk/clk-fixed.c b/drivers/clk/clk-fixed.c
> new file mode 100644
> index 0000000..956fb9a
> --- /dev/null
> +++ b/drivers/clk/clk-fixed.c
> @@ -0,0 +1,24 @@
> +/*
> + * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@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.
> + *
> + * Simple fixed-rate clock implementation
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +
> +#define to_clk_fixed(c) container_of(c, struct clk_hw_fixed, hw)
> +
> +static unsigned long clk_fixed_recalc_rate(struct clk_hw *hw)
> +{
> +	return to_clk_fixed(hw)->rate;
> +}
> +
> +struct clk_hw_ops clk_fixed_ops = {
> +	.recalc_rate = clk_fixed_recalc_rate,
> +};
> +EXPORT_SYMBOL_GPL(clk_fixed_ops);
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index 0d2cd5e..1903dd8 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -110,6 +110,20 @@ int clk_prepare(struct clk *clk);
>   */
>  void clk_unprepare(struct clk *clk);
>  
> +/* Base clock implementations. Platform clock implementations can use these
> + * directly, or 'subclass' as approprate */
> +
/*
 * Multiple lines comments
 */

Regards,
Shawn

> +#ifdef CONFIG_GENERIC_CLK_FIXED
> +
> +struct clk_hw_fixed {
> +	struct clk_hw	hw;
> +	unsigned long	rate;
> +};
> +
> +extern struct clk_hw_ops clk_fixed_ops;
> +
> +#endif /* CONFIG_GENERIC_CLK_FIXED */
> +
>  /**
>   * clk_register - register and initialize a new clock
>   *
> -- 
> 1.7.4.1
> 
>