clk: mux: Support CLK_SET_RATE_NO_REPARENT flag ...

Since barebox doesn't do reparenting on rate changes we only have
to define the flag.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: mux: Support CLK_MUX_READ_ONLY flag ...

Support readonly dividers using the CLK_MUX_READ_ONLY flag.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: mux: Support mux specific flags ...

We'll need mux specific flags in the future, so add a parameter to
the mux initialization functions.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: divider: Support CLK_DIVIDER_READ_ONLY flag ...

To support a readonly divider add the CLK_DIVIDER_READ_ONLY flag.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: divider: pass divider flags ...

The generic clk divider needs clock flags and divider flags. Fix
prototypes to take both as separate arguments.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Support CLK_IS_CRITICAL flag ...

Support CLK_IS_CRITICAL flag. Simply do not disable the clock even when
the enable count is zero.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Make CLK_IGNORE_UNUSED generic ...

barebox will never disable unused clocks, so add CLK_IGNORE_UNUSED as a
no-op flag. With this we can keep the changes to the imported kernel
code smaller.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: export clk_gate_is_enabled() ...

Will be needed by stm32 clk support.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: parent_names should be const ...

Not only the array of pointers should be const, but also the strings
they point to. Add missing const.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/imx8-usb'

clk: at91: update to PMC bindings ...

Based on kernel 5.0-rc6 update at91 clk support
to match the new PMC bindings.

Manually added all changes done in the kernel from 4.9-rc3 to 5.0-rc6.
New drivers required was added as seperate commits.

This includes dt-compat code required to support at91sam5d3,
as this is not yet ported to use the new PMC bindings.

clk-programmable saw some extra changes - it had never been bulit.
It is used only by at91sama5d2 - and barebox has no board support for
this cpu (yet).

The CONFIG_SOC symbols is used to select the relevant drivers.
CONFIG_SOC_SAM9 selects several drivers, and in the future
this can be split to keep the image size down.

In the kernel CLK_OF_DECLARE_DRIVER() can be used for a two step init.
In barebox this is a simple one step init.
It was added to have less differences between the kernel and the barebox
versions of the drivers.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Tested-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Import a subset of clk_bulk API from Linux ...

Import a subset of clk_bulk API from Linux to support porting kernel
code that uses it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Drop separate definitions of clk_put() ...

Regardless of the value of CONFIG_HAVE_CLK, clk_put() implementation
is always a no-op. Move the definition to linux/clk.h and drop the
rest of the code implementing it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: add divider_recalc_rate helper ...

Closer to Linux kernel implementation and needed for imx8mq
composite clock.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: move struct clk_mux into header ...

To make it reusable in a composite clock.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: move struct clk_gate into header ...

To make it reusable in a composite clock.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: add missing list.h include ...

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: straighten some inline wrappers for use without of support ...

- Move struct clk_onecell_data outside of CONFIG_COMMON_CLK_OF_PROVIDER
- Provide static inline wrapper for of_clk_add_provider()
- Provide static inline wrapper for of_clk_src_onecell_get()

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Forward declare struct of_device_id in linux/clk.h ...

Forward declare struct of_device_id in linux/clk.h in order to avoid
warnings like the following:

warning: 'struct of_device_id' declared inside parameter list will not be visible outside
of this definition or declaration
 int of_clk_init(struct device_node *root, const struct of_device_id *matches);
                                                        ^~~~~~~~~~~~

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: No-op CLK_OF_DECLARE if not enabled ...

Instead of wrapping each defenition of CLK_OF_DECLARE hook with
preprocessor guards, change the definition of CLK_OF_DECLARE to expand
into no-op if COMMON_CLK_OF_PROVIDER is not enabled.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Make COMMON_CLK_OF_PROVIDER depend on OFTREE ...

Make COMMON_CLK_OF_PROVIDER depend on OFTREE, this way checking for:

	defined(CONFIG_OFTREE) && defined(CONFIG_COMMON_CLK_OF_PROVIDER)

can be simplified to just:

	defined(CONFIG_COMMON_CLK_OF_PROVIDER)

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Port two helper functions from Linux ...

Port of_clk_get_parent_count() and of_clk_parent_fill() from Linux.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: Add support for shared gates ...

Sometimes a single software control knob controls multiple gates
in hardware. This patch adds support for shared gates which help
coping this situation. The first gate is registered with the hardware
gate as usual, the others are registered as shared gates which does
not have hardware control itself, but only switches the real hardware
gate.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: implement CLK_OPS_PARENT_ENABLE ...

Some clocks may only be modified when their parent clocks are enabled.
The kernel has the CLK_OPS_PARENT_ENABLE flag for this purpose.
Implement it for barebox aswell.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: add clock command completion ...

This adds tab completion for the clk_* commands.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

clk: of: fix clk_of_table generation ...

We used to collect all sections beginning with __clk_of_table_ in a single
section in the linker using KEEP(*(.__clk_of_table_*)). That the sentinel
entry ended up as the last entry was pure luck, but not always the case.

Instead of putting all entries in different sections we now put all entries
in the same section. Only the sentinel entry gets its own section and is
collected by the linker separately.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reported-by: Andreas Willig <andreas.willig@rafi.de>
Tested-by:  Andreas Willig <andreas.willig@rafi.de>

of: use 'const void *' for struct of_device_id.data ...

Since 2011 barebox' of_device_id struct uses unsigned long type for data field:

    struct of_device_id {
            char *compatible;
            unsigned long data;
    };

Almost always struct of_device_id.data field are used as pointer
and need 'unsigned long' casting.

E.g. see 'git grep -A 4 of_device_id drivers/' output:

    drivers/ata/sata-imx.c:static __maybe_unused struct of_device_id imx_sata_dt_ids[] = {
    drivers/ata/sata-imx.c- {
    drivers/ata/sata-imx.c-         .compatible = "fsl,imx6q-ahci",
    drivers/ata/sata-imx.c-         .data = (unsigned long)&data_imx6,
    drivers/ata/sata-imx.c- }, {

Here is of_device_id struct in linux kernel v4.0:

    struct of_device_id {
            char name[32];
            char type[32];
            char compatible[128];
            const void *data;
    };

Changing of_device_id.data type to 'const void *data' will increase
barebox' linux kernel compatibility and decrease number of 'unsigned
long' casts.

Part of the patch was done using the 'coccinelle' tool with the
following semantic patch:

    @rule1@
    identifier dev;
    identifier type;
    identifier func;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type)
    + dev_get_drvdata(dev, (const void **)&type)
    ...>
    }
    @rule2@
    identifier dev;
    identifier type;
    identifier func;
    identifier data;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type->data)
    + dev_get_drvdata(dev, (const void **)&type->data)
    ...>
    }

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

CLK: clk-divider: Respect CLK_DIVIDER_POWER_OF_TWO flag ...

Signed-off-by: Andrey Panov <rockford@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

CLK: clk-divider: Introduce clk_divider_alloc() and *_free() routines ...

Signed-off-by: Andrey Panov <rockford@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

CLK: clk-divider: Respect CLK_DIVIDER_HIWORD_MASK flag ...

It is required for Rockchip SoCs where clock settings registers have
write-enable mask in high word.

Signed-off-by: Andrey Panov <rockford@yandex.ru>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>