[PATCH 0/3] Common struct clk implementation, v7
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Wed Sep 15 01:53:20 EDT 2010
Hi,
please put sh ml in cc too as we use the same clkdev
Best Regards,
J.
On 11:40 Wed 15 Sep , Jeremy Kerr wrote:
> Hi all,
>
> These patches are an attempt to allow platforms to share clock code. At
> present, the definitions of 'struct clk' are local to platform code,
> which makes allocating and initialising cross-platform clock sources
> difficult, and makes it impossible to compile a single image containing
> support for two ARM platforms with different struct clks.
>
> The two patches are for the architecture-independent kernel code,
> introducing the common clk infrastructure. The changelog for the first
> patch includes details about the new clock definitions.
>
> As requested by rmk, I've put together a small series of patches
> illustrating the usage of the common struct clock on the ARM imx51
> platform. These are available in my git tree:
>
> git://kernel.ubuntu.com/jk/dt/linux-2.6
>
> in the clk-common-mx51 branch (clk-common..clk-common-mx51). There is
> also a port for versatile (clk-common-versatile) in this tree too.
>
> The approach I've taken with the imx51 port is to temporarly duplicate
> the platform-common clock code (ie, for all mxc-based boards) to enable
> usage of the common struct clk on one machine (imx51), while leaving the
> others as-is. For a proper platform-wide usage of the common struct clk,
> we'd be better off doing the whole platform at once. However, mx51 is
> the only mxc-based HW I have, hence the duplicated example port.
>
> In the example port, the first change simply converts the mxc's struct
> clk to a struct clk_mxc, using the new API. The subsequent patches move
> certain clocks to more specific data structures (eg clk_fixed and
> clk_pll) where possible.
>
> Ben Herrenschmidt is looking at using common struct clk code for powerpc
> too, hence the kernel-wide approach.
>
> Many thanks to the following for their input:
> * Ben Dooks <ben-linux at fluff.org>
> * Baruch Siach <baruch at tkos.co.il>
> * Russell King <linux at arm.linux.org.uk>
> * Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
> * Lorenzo Pieralisi <Lorenzo.Pieralisi at arm.com>
>
> Russell - now that we've had a few platforms ported to the common clk
> infrastructure, I believe it's ready to merge. If so, do you want this
> in the patch tracker? Otherwise, let me know what needs changing.
>
> This series includes a patch to hook the common clk API into ARM.
>
> Cheers,
>
>
> Jeremy
>
> --
> v7:
> * change CLK_INIT to initialise clk->mutex statically
>
> v6:
> * fixed up references to 'clk_operations' in the changelog
>
> v5:
> * uninline main API, and share definitions with !USE_COMMON_STRUCT_CLK
> * add __clk_get
> * delay mutex init
> * kerneldoc for struct clk
>
> v4:
> * use mutex for enable/disable locking
> * DEFINE_CLK -> INIT_CLK, and pass the clk name for mutex init
> * struct clk_operations -> struct clk_ops
>
> v3:
> * do clock usage refcounting in common code
> * provide sample port
>
> v2:
> * no longer ARM-specific
> * use clk_operations
>
> ---
> Jeremy Kerr (3):
> Add a common struct clk
> clk: Generic support for fixed-rate clocks
> arm/clkdev: Allow common struct clk usage
>
>
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