[PATCH 0/2] Common struct clk implementation, v14

[Jeremy Kerr]

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 three 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.

Many thanks to the following for their input:
 * Benjamin Herrenschmidt <benh at kernel.crashing.org>
 * 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>
 * Vincent Guittot <vincent.guittot at linaro.org>
 * Sascha Hauer <s.hauer at pengutronix.de>
 * Ryan Mallon <ryan at bluewatersys.com>
 * Colin Cross <ccross at google.com>
 * Jassi Brar <jassisinghbrar at gmail.com>
 * Saravana Kannan <skannan at codeaurora.org>

Cheers,


Jeremy

--
v14:
 * make empty clk_prepare & clk_unprepare static inline

v13:
 * Don't expose __clk_get and clk_put - prototypes in clkdev.c instead
 * Add might_sleep to clk_set_rate
 * Comment clarifications & fixups
 * Remove zero initialisers
 * Fold warnings into main clk.c change

v12:
 * Always refcount, even when enable/prepare ops are NULL
 * Unify prepare & enable count checking
 * Update comments for prepare/unprepare
 * Use spin_{lock,unlock}_irqsave
 * Change clk_put to __clk_put, and use the shared clk_put

v11:
 * add prepare/unprepare for non-atomic switching, document atomicity
 * move to drivers/clk/

v10:
 * comment fixups, from Uwe's review
 * added DEFINE_CLK_FIXED

v9:
 * comment improvements
 * kerneldoc fixups
 * add WARN_ON to clk_disable

v8:
 * add atomic clocks, and locking wrappers
 * expand comments on clk and clk_ops

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 (2):
      Add a common struct clk
      clk: Generic support for fixed-rate clocks