docs: driver-api: add clk documentation

The clk.rst is already in ReST format. So, move it to the
driver-api guide, where it belongs.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

2 files changed, 308 insertions, 0 deletions

diff --git a/Documentation/driver-api/clk.rst b/Documentation/driver-api/clk.rst
new file mode 100644
index 000000000000..511628bb3d3a
--- /dev/null
+++ b/Documentation/driver-api/clk.rst
@@ -0,0 +1,307 @@
+========================
+The Common Clk Framework
+========================
+
+:Author: Mike Turquette <mturquette@ti.com>
+
+This document endeavours to explain the common clk framework details,
+and how to port a platform over to this framework.  It is not yet a
+detailed explanation of the clock api in include/linux/clk.h, but
+perhaps someday it will include that information.
+
+Introduction and interface split
+================================
+
+The common clk framework is an interface to control the clock nodes
+available on various devices today.  This may come in the form of clock
+gating, rate adjustment, muxing or other operations.  This framework is
+enabled with the CONFIG_COMMON_CLK option.
+
+The interface itself is divided into two halves, each shielded from the
+details of its counterpart.  First is the common definition of struct
+clk which unifies the framework-level accounting and infrastructure that
+has traditionally been duplicated across a variety of platforms.  Second
+is a common implementation of the clk.h api, defined in
+drivers/clk/clk.c.  Finally there is struct clk_ops, whose operations
+are invoked by the clk api implementation.
+
+The second half of the interface is comprised of the hardware-specific
+callbacks registered with struct clk_ops and the corresponding
+hardware-specific structures needed to model a particular clock.  For
+the remainder of this document any reference to a callback in struct
+clk_ops, such as .enable or .set_rate, implies the hardware-specific
+implementation of that code.  Likewise, references to struct clk_foo
+serve as a convenient shorthand for the implementation of the
+hardware-specific bits for the hypothetical "foo" hardware.
+
+Tying the two halves of this interface together is struct clk_hw, which
+is defined in struct clk_foo and pointed to within struct clk_core.  This
+allows for easy navigation between the two discrete halves of the common
+clock interface.
+
+Common data structures and api
+==============================
+
+Below is the common struct clk_core definition from
+drivers/clk/clk.c, modified for brevity::
+
+	struct clk_core {
+		const char		*name;
+		const struct clk_ops	*ops;
+		struct clk_hw		*hw;
+		struct module		*owner;
+		struct clk_core		*parent;
+		const char		**parent_names;
+		struct clk_core		**parents;
+		u8			num_parents;
+		u8			new_parent_index;
+		...
+	};
+
+The members above make up the core of the clk tree topology.  The clk
+api itself defines several driver-facing functions which operate on
+struct clk.  That api is documented in include/linux/clk.h.
+
+Platforms and devices utilizing the common struct clk_core use the struct
+clk_ops pointer in struct clk_core to perform the hardware-specific parts of
+the operations defined in clk-provider.h::
+
+	struct clk_ops {
+		int		(*prepare)(struct clk_hw *hw);
+		void		(*unprepare)(struct clk_hw *hw);
+		int		(*is_prepared)(struct clk_hw *hw);
+		void		(*unprepare_unused)(struct clk_hw *hw);
+		int		(*enable)(struct clk_hw *hw);
+		void		(*disable)(struct clk_hw *hw);
+		int		(*is_enabled)(struct clk_hw *hw);
+		void		(*disable_unused)(struct clk_hw *hw);
+		unsigned long	(*recalc_rate)(struct clk_hw *hw,
+						unsigned long parent_rate);
+		long		(*round_rate)(struct clk_hw *hw,
+						unsigned long rate,
+						unsigned long *parent_rate);
+		int		(*determine_rate)(struct clk_hw *hw,
+						  struct clk_rate_request *req);
+		int		(*set_parent)(struct clk_hw *hw, u8 index);
+		u8		(*get_parent)(struct clk_hw *hw);
+		int		(*set_rate)(struct clk_hw *hw,
+					    unsigned long rate,
+					    unsigned long parent_rate);
+		int		(*set_rate_and_parent)(struct clk_hw *hw,
+					    unsigned long rate,
+					    unsigned long parent_rate,
+					    u8 index);
+		unsigned long	(*recalc_accuracy)(struct clk_hw *hw,
+						unsigned long parent_accuracy);
+		int		(*get_phase)(struct clk_hw *hw);
+		int		(*set_phase)(struct clk_hw *hw, int degrees);
+		void		(*init)(struct clk_hw *hw);
+		int		(*debug_init)(struct clk_hw *hw,
+					      struct dentry *dentry);
+	};
+
+Hardware clk implementations
+============================
+
+The strength of the common struct clk_core comes from its .ops and .hw pointers
+which abstract the details of struct clk from the hardware-specific bits, and
+vice versa.  To illustrate consider the simple gateable clk implementation in
+drivers/clk/clk-gate.c::
+
+	struct clk_gate {
+		struct clk_hw	hw;
+		void __iomem    *reg;
+		u8              bit_idx;
+		...
+	};
+
+struct clk_gate contains struct clk_hw hw as well as hardware-specific
+knowledge about which register and bit controls this clk's gating.
+Nothing about clock topology or accounting, such as enable_count or
+notifier_count, is needed here.  That is all handled by the common
+framework code and struct clk_core.
+
+Let's walk through enabling this clk from driver code::
+
+	struct clk *clk;
+	clk = clk_get(NULL, "my_gateable_clk");
+
+	clk_prepare(clk);
+	clk_enable(clk);
+
+The call graph for clk_enable is very simple::
+
+	clk_enable(clk);
+		clk->ops->enable(clk->hw);
+		[resolves to...]
+			clk_gate_enable(hw);
+			[resolves struct clk gate with to_clk_gate(hw)]
+				clk_gate_set_bit(gate);
+
+And the definition of clk_gate_set_bit::
+
+	static void clk_gate_set_bit(struct clk_gate *gate)
+	{
+		u32 reg;
+
+		reg = __raw_readl(gate->reg);
+		reg |= BIT(gate->bit_idx);
+		writel(reg, gate->reg);
+	}
+
+Note that to_clk_gate is defined as::
+
+	#define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
+
+This pattern of abstraction is used for every clock hardware
+representation.
+
+Supporting your own clk hardware
+================================
+
+When implementing support for a new type of clock it is only necessary to
+include the following header::
+
+	#include <linux/clk-provider.h>
+
+To construct a clk hardware structure for your platform you must define
+the following::
+
+	struct clk_foo {
+		struct clk_hw hw;
+		... hardware specific data goes here ...
+	};
+
+To take advantage of your data you'll need to support valid operations
+for your clk::
+
+	struct clk_ops clk_foo_ops {
+		.enable		= &clk_foo_enable;
+		.disable	= &clk_foo_disable;
+	};
+
+Implement the above functions using container_of::
+
+	#define to_clk_foo(_hw) container_of(_hw, struct clk_foo, hw)
+
+	int clk_foo_enable(struct clk_hw *hw)
+	{
+		struct clk_foo *foo;
+
+		foo = to_clk_foo(hw);
+
+		... perform magic on foo ...
+
+		return 0;
+	};
+
+Below is a matrix detailing which clk_ops are mandatory based upon the
+hardware capabilities of that clock.  A cell marked as "y" means
+mandatory, a cell marked as "n" implies that either including that
+callback is invalid or otherwise unnecessary.  Empty cells are either
+optional or must be evaluated on a case-by-case basis.
+
+.. table:: clock hardware characteristics
+
+   +----------------+------+-------------+---------------+-------------+------+
+   |                | gate | change rate | single parent | multiplexer | root |
+   +================+======+=============+===============+=============+======+
+   |.prepare        |      |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.unprepare      |      |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   +----------------+------+-------------+---------------+-------------+------+
+   |.enable         | y    |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.disable        | y    |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.is_enabled     | y    |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   +----------------+------+-------------+---------------+-------------+------+
+   |.recalc_rate    |      | y           |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.round_rate     |      | y [1]_      |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.determine_rate |      | y [1]_      |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.set_rate       |      | y           |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   +----------------+------+-------------+---------------+-------------+------+
+   |.set_parent     |      |             | n             | y           | n    |
+   +----------------+------+-------------+---------------+-------------+------+
+   |.get_parent     |      |             | n             | y           | n    |
+   +----------------+------+-------------+---------------+-------------+------+
+   +----------------+------+-------------+---------------+-------------+------+
+   |.recalc_accuracy|      |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+   +----------------+------+-------------+---------------+-------------+------+
+   |.init           |      |             |               |             |      |
+   +----------------+------+-------------+---------------+-------------+------+
+
+.. [1] either one of round_rate or determine_rate is required.
+
+Finally, register your clock at run-time with a hardware-specific
+registration function.  This function simply populates struct clk_foo's
+data and then passes the common struct clk parameters to the framework
+with a call to::
+
+	clk_register(...)
+
+See the basic clock types in ``drivers/clk/clk-*.c`` for examples.
+
+Disabling clock gating of unused clocks
+=======================================
+
+Sometimes during development it can be useful to be able to bypass the
+default disabling of unused clocks. For example, if drivers aren't enabling
+clocks properly but rely on them being on from the bootloader, bypassing
+the disabling means that the driver will remain functional while the issues
+are sorted out.
+
+To bypass this disabling, include "clk_ignore_unused" in the bootargs to the
+kernel.
+
+Locking
+=======
+
+The common clock framework uses two global locks, the prepare lock and the
+enable lock.
+
+The enable lock is a spinlock and is held across calls to the .enable,
+.disable operations. Those operations are thus not allowed to sleep,
+and calls to the clk_enable(), clk_disable() API functions are allowed in
+atomic context.
+
+For clk_is_enabled() API, it is also designed to be allowed to be used in
+atomic context. However, it doesn't really make any sense to hold the enable
+lock in core, unless you want to do something else with the information of
+the enable state with that lock held. Otherwise, seeing if a clk is enabled is
+a one-shot read of the enabled state, which could just as easily change after
+the function returns because the lock is released. Thus the user of this API
+needs to handle synchronizing the read of the state with whatever they're
+using it for to make sure that the enable state doesn't change during that
+time.
+
+The prepare lock is a mutex and is held across calls to all other operations.
+All those operations are allowed to sleep, and calls to the corresponding API
+functions are not allowed in atomic context.
+
+This effectively divides operations in two groups from a locking perspective.
+
+Drivers don't need to manually protect resources shared between the operations
+of one group, regardless of whether those resources are shared by multiple
+clocks or not. However, access to resources that are shared between operations
+of the two groups needs to be protected by the drivers. An example of such a
+resource would be a register that controls both the clock rate and the clock
+enable/disable state.
+
+The clock framework is reentrant, in that a driver is allowed to call clock
+framework functions from within its implementation of clock operations. This
+can for instance cause a .set_rate operation of one clock being called from
+within the .set_rate operation of another clock. This case must be considered
+in the driver implementations, but the code flow is usually controlled by the
+driver in that case.
+
+Note that locking must also be considered when code outside of the common
+clock framework needs to access resources used by the clock operations. This
+is considered out of scope of this document.
diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index 3ac51c94f97b..5d04296f5ce0 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -17,6 +17,7 @@ available subsections can be seen below.
    basics
    infrastructure
    pm/index
+   clk
    device-io
    device_connection
    dma-buf