linux-toradex.git/include/linux/clk-provider.h, branch v4.4.129

clk-divider: make sure read-only dividers do not write to their register

2016-05-11T09:21:11+00:00

commit 50359819794b4a16ae35051cd80f2dab025f6019 upstream.

Commit e6d5e7d90be9 ("clk-divider: Fix READ_ONLY when divider > 1") removed
the special ops struct for read-only clocks and instead opted to handle
them inside the regular ops.

On the rk3368 this results in breakage as aclkm now gets set a value.
While it is the same divider value, the A53 core still doesn't like it,
which can result in the cpu ending up in a hang.
The reason being that "ACLKENMasserts one clock cycle before the rising
edge of ACLKM" and the clock should only be touched when STANDBYWFIL2
is asserted.

To fix this, reintroduce the read-only ops but do include the round_rate
callback. That way no writes that may be unsafe are done to the divider
register in any case.

The Rockchip use of the clk_divider_ops is adapted to this split again,
as is the nxp, lpc18xx-ccu driver that was included since the original
commit. On lpc18xx-ccu the divider seems to always be read-only
so only uses the new ops now.

Fixes: e6d5e7d90be9 ("clk-divider: Fix READ_ONLY when divider > 1")
Reported-by: Zhang Qing 
Signed-off-by: Heiko Stuebner 
Signed-off-by: Stephen Boyd 
Signed-off-by: Greg Kroah-Hartman

clk: Add clk_hw_is_enabled() for use by clk providers

2015-10-26T19:36:55+00:00

Add clk_hw_is_enabled() to the provider APIs so clk providers can
use a struct clk_hw instead of a struct clk to check if a clk is
enabled or not.

Signed-off-by: Joachim Eastwood 
Signed-off-by: Stephen Boyd

clk: Add stubs for of_clk_*() APIs when CONFIG_OF=n

2015-10-26T18:57:50+00:00

Compiling the versatile clock driver with COMPILE_TEST=y and CONFIG_OF=n
leads to the following error:

   drivers/clk/versatile/clk-sp810.c: In function 'clk_sp810_of_setup':
   drivers/clk/versatile/clk-sp810.c:103:6: error: implicit declaration of
function 'of_clk_parent_fill' [-Werror=implicit-function-declaration]

Silence it by providing stubs APIs for of_clk_parent_fill().
Throw in a stub for of_clk_get_parent_count() too because we're
in the area.

Reported-by: kbuild test robot 
Cc: Javier Martinez Canillas 
Signed-off-by: Stephen Boyd

clk: Remove clk_{register,unregister}_multiplier()

2015-10-23T20:34:46+00:00

These APIs aren't used, so remove them. This can be reverted if
we get a user at some point.

Reviewed-by: Maxime Ripard 
Suggested-by: Michael Turquette 
Signed-off-by: Stephen Boyd

Merge tag 'sunxi-clocks-for-4.4' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into clk-next

2015-10-21T23:29:03+00:00

Pull Allwinner clock additions for 4.4 from Maxime Ripard:

  - Support for the Audio PLL and child clocks
  - Support for the A33 AHB gates
  - New clk-multiplier generic driver

* tag 'sunxi-clocks-for-4.4' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux:
  clk: sunxi: mod1 clock support
  clk: sunxi: codec clock support
  clk: sunxi: pll2: Add A13 support
  clk: sunxi: Add a driver for the PLL2
  clk: Add a basic multiplier clock
  clk: sunxi: Add A33 gates support

clk: Add a basic multiplier clock

2015-10-21T19:51:27+00:00

Some clocks are using a multiplier component, however, unlike their mux,
gate or divider counterpart, these factors don't have a basic clock
implementation.

This leads to code duplication across platforms that want to use that kind
of clocks, and the impossibility to use the composite clocks with such a
clock without defining your own rate operations.

Create such a driver in order to remove these issues, and hopefully factor
the implementations, reducing code size across platforms and consolidating
the various implementations.

Signed-off-by: Maxime Ripard 
Reviewed-by: Chen-Yu Tsai

clk: Make clk input parameter of __clk_get_name() const

2015-10-16T18:56:19+00:00

When calling __clk_get_name() on a const clock:

    warning: passing argument 1 of '__clk_get_name' discards 'const' qualifier from pointer target type
    include/linux/clk-provider.h:613:13: note: expected 'struct clk *' but argument is of type 'const struct clk *'

__clk_get_name() does not modify the passed clock, hence make it const.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Stephen Boyd

clk: fractional-divider: keep mwidth and nwidth internally

2015-10-02T18:29:46+00:00

The patch adds mwidth and nwidth fields to the struct clk_fractional_divider
for further usage. While here, use GENMASK() instead of open coding this
functionality.

Reviewed-by: Heikki Krogerus 
Signed-off-by: Andy Shevchenko 
Signed-off-by: Stephen Boyd

clk: Constify clk_hw argument to provider APIs

2015-08-24T23:49:11+00:00

We don't modify the clk_hw argument in these functions, so it's
safe to mark it as const.

Signed-off-by: Stephen Boyd

clk: Remove unused provider APIs

2015-08-24T23:49:02+00:00

Remove these APIs now that we've converted all users to the
replacement struct clk_hw based versions.

Signed-off-by: Stephen Boyd