linux-stable.git/include/linux/clk-provider.h, branch v3.13.2

clk: of: helper for determining number of parent clocks

2013-10-08T06:13:33+00:00

Walks the "clocks" array of parent clock phandles and returns the
number.

Signed-off-by: Mike Turquette

clk: wrap I/O access for improved portability

2013-08-28T00:50:38+00:00

the common clock drivers were motivated/initiated by ARM development
and apparently assume little endian peripherals

wrap register/peripherals access in the common code (div, gate, mux)
in preparation of adding COMMON_CLK support for other platforms

Signed-off-by: Gerhard Sittig 
Signed-off-by: Mike Turquette

clk: clk-mux: implement remuxing on set_rate

2013-08-19T19:27:18+00:00

Implement clk-mux remuxing if the CLK_SET_RATE_NO_REPARENT flag isn't
set. This implements determine_rate for clk-mux to propagate to each
parent and to choose the best one (like clk-divider this chooses the
parent which provides the fastest rate <= the requested rate).

The determine_rate op is implemented as a core helper function so that
it can be easily used by more complex clocks which incorporate muxes.

Signed-off-by: James Hogan 
Reviewed-by: Stephen Boyd 
Cc: Mike Turquette 
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Mike Turquette

clk: add CLK_SET_RATE_NO_REPARENT flag

2013-08-19T19:27:17+00:00

Add a CLK_SET_RATE_NO_REPARENT clock flag, which will prevent muxes
being reparented during clk_set_rate.

To avoid breaking existing platforms, all callers of clk_register_mux()
are adjusted to pass the new flag. Platform maintainers are encouraged
to remove the flag if they wish to allow mux reparenting on set_rate.

Signed-off-by: James Hogan 
Reviewed-by: Stephen Boyd 
Cc: Mike Turquette 
Cc: Russell King 
Cc: Sascha Hauer 
Cc: Stephen Warren 
Cc: Viresh Kumar 
Cc: Kukjin Kim 
Cc: Haojian Zhuang 
Cc: Chao Xie 
Cc: Arnd Bergmann 
Cc: "Emilio López" 
Cc: Gregory CLEMENT 
Cc: Maxime Ripard 
Cc: Prashant Gaikwad 
Cc: Thierry Reding 
Cc: Peter De Schrijver 
Cc: Pawel Moll 
Cc: Catalin Marinas 
Cc: Andrew Chew 
Cc: Doug Anderson 
Cc: Heiko Stuebner 
Cc: Paul Walmsley 
Cc: Sylwester Nawrocki 
Cc: Thomas Abraham 
Cc: Tomasz Figa 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: spear-devel@list.st.com
Cc: linux-tegra@vger.kernel.org
Tested-by: Haojian Zhuang 
Acked-by: Stephen Warren  [tegra]
Acked-by: Maxime Ripard  [sunxi]
Acked-by: Sören Brinkmann  [Zynq]
Signed-off-by: Mike Turquette

clk: add support for clock reparent on set_rate

2013-08-19T19:27:17+00:00

Add core support to allow clock implementations to select the best
parent clock when rounding a rate, e.g. the one which can provide the
closest clock rate to that requested. This is by way of adding a new
clock op, determine_rate(), which is like round_rate() but has an extra
parameter to allow the clock implementation to optionally select a
different parent clock. The core then takes care of reparenting the
clock when setting the rate.

The parent change takes place with the help of some new private data
members. struct clk::new_parent specifies a clock's new parent (NULL
indicates no change), and struct clk::new_child specifies a clock's new
child (whose new_parent member points back to it). The purpose of these
are to allow correct walking of the future tree for notifications prior
to actually reparenting any clocks, specifically to skip child clocks
who are being reparented to another clock (they will be notified via the
new parent), and to include any new child clock. These pointers are set
by clk_calc_subtree(), and the new_child pointer gets cleared when a
child is actually reparented to avoid duplicate POST_RATE_CHANGE
notifications.

Each place where round_rate() is called, determine_rate() is checked
first and called in preference. This restructures a few of the call
sites to simplify the logic into if/else blocks.

Signed-off-by: James Hogan 
Reviewed-by: Stephen Boyd 
Cc: Mike Turquette 
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Mike Turquette

clk: abstract parent cache

2013-08-19T19:27:15+00:00

Abstract access to the clock parent cache by defining
clk_get_parent_by_index(clk, index). This allows access to parent
clocks from clock drivers.

Signed-off-by: James Hogan 
Reviewed-by: Stephen Boyd 
Cc: Mike Turquette 
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Mike Turquette

clk: mux: Add support for read-only muxes.

2013-08-05T18:56:46+00:00

Some platforms have read-only clock muxes that are preconfigured at
reset and cannot be changed at runtime. This patch extends mux clock
driver to allow handling such read-only muxes by adding new
CLK_MUX_READ_ONLY mux flag.

Signed-off-by: Tomasz Figa 
Signed-off-by: Mike Turquette

clk: gate: add CLK_GATE_HIWORD_MASK

2013-06-16T03:23:53+00:00

In Rockchip Cortex-A9 based chips, they don't use paradigm of
reading-changing-writing the register contents.  Instead they
use a hiword mask to indicate the changed bits.

When b1 should be set as gate, it also needs to indicate the change
by setting hiword mask (b1 << 16).

The patch adds gate flag for this usage.

Signed-off-by: Heiko Stuebner 
Signed-off-by: Haojian Zhuang 
Signed-off-by: Mike Turquette

clk: divider: add CLK_DIVIDER_HIWORD_MASK flag

2013-06-16T03:23:49+00:00

In both Hisilicon & Rockchip Cortex-A9 based chips, they don't use the
paradigm of reading-changing-writing the register contents.
Instead they use a hiword mask to indicate the changed bits.

When b01 should be set as setting divider, it also needs to indicate
the change by setting hiword mask (b11 << 16).

The patch adds divider flag for this usage.

Signed-off-by: Heiko Stuebner 
Signed-off-by: Haojian Zhuang 
Signed-off-by: Mike Turquette

clk: mux: add CLK_MUX_HIWORD_MASK

2013-06-16T03:23:36+00:00

In both Hisilicon & Rockchip Cortex-A9 based chips, they don't use the
paradigm of reading-changing-writing the register contents.
Instead they use a hiword mask to indicate the changed bits.

When b01 should be set as switching mux, it also needs to indicate
the change by setting hiword mask (b11 << 16).

The patch adds mux flag for this usage.

Signed-off-by: Heiko Stuebner 
Signed-off-by: Haojian Zhuang 
Signed-off-by: Mike Turquette