clk: exynos: Fix incorrect clock lookup for non-top CMUs

Samsung clock drivers usually define the clock indices that are unique
per one CMU, but are not unique across all CMUs. That is, clock indices
start from 1 for each CMU, as provided in CMU bindings header. The way
the clock lookup via clk_get_by_index() works at the moment is by using
clk_of_xlate_default(), which returns globally non-unique clock ids for
for clocks registered with Samsung CCF API, which leads to incorrect
clocks being obtained. One way to fix that would be to make all clock
ids defined in the bindings header unique, but it'd make it incompatible
with Linux kernel bindings header. A better way to solve this issue is
to calculate the global clock id and use it when registering a clock
with clk_dm() and when obtaining it, in a custom .of_xlate function.

This patch adds an API for such mapping calculation, introducing the
necessary modifications to CMU registering functions in Samsung CCF.
Exynos850 clock driver (the only driver that uses Samsung CCF at the
moment) is modified accordingly, as it uses the changed API. So the
clock lookup with clk-exynos850.c driver is also fixed here.

The global clock id is calculated from CMU id and local clock id in
SAMSUNG_TO_CLK_ID() macro like this:

clk_id_global = cmu_id * 256 + clk_id_local

leaving a range of up to 256 clocks for each CMU. Then this mapping
macro is used in clk_dm() to register clocks using their global ids, and
in .of_xlate() to lookup the clock by its local id correctly. Because
.of_xlate() operation has a separate function for each CMU, it "knows"
the correct way of finding the correct clk_id_global by provided
clk_id_local.

Fixes: ff3e8b8c6c22 ("clk: exynos: Add Samsung clock framework")
Fixes: a36cc5e3ef4d ("clk: exynos: Add Exynos850 clock driver")
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Don't expose prototypes for not used functions

Samsung CCF is meant to be used from the clock drivers by calling the
CMU registration API, i.e.:
- samsung_cmu_register_one() -- for top-level CMU
- samsung_register_cmu() -- for the rest of CMUs

Functions for registering separate clocks is probably not going to be
very useful, and isn't used at the moment. Remove prototypes of those
functions to make the Samsung CCF interface more compact and clear.

No functional change.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Add Samsung clock framework

Heavily based on Linux kernel Samsung clock framework, with some changes
to accommodate the differences in U-Boot CCF implementation. It's also
quite minimal as compared to the Linux version.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Move pll code into clk-exynos7420

PLL utilities code is only used by clk-exynos7420 driver at the moment.
Move it into clk-exynos7420 to make clk-pll.c file available for CCF PLL
clocks implementation, which is coming in the next patches.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Add header guard for clk-pll.h

The clk-pll.h is going to be included in multiple files soon. Add
missing header guard to prevent possible build errors in future.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Fixes: 166097e87753 ("clk: exynos: add clock driver for Exynos7420 Soc")
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

clk: exynos: add clock driver for Exynos7420 Soc

Add a clock driver for Exynos7420 SoC. There are about 25 clock controller
blocks in Exynos7420 out of which support for topc, top0 and peric1 blocks
are added in this initial version of the driver.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Add Samsung clock framework

Heavily based on Linux kernel Samsung clock framework, with some changes
to accommodate the differences in U-Boot CCF implementation. It's also
quite minimal as compared to the Linux version.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Move pll code into clk-exynos7420

PLL utilities code is only used by clk-exynos7420 driver at the moment.
Move it into clk-exynos7420 to make clk-pll.c file available for CCF PLL
clocks implementation, which is coming in the next patches.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Add header guard for clk-pll.h

The clk-pll.h is going to be included in multiple files soon. Add
missing header guard to prevent possible build errors in future.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Fixes: 166097e87753 ("clk: exynos: add clock driver for Exynos7420 Soc")
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

clk: exynos: add clock driver for Exynos7420 Soc

Add a clock driver for Exynos7420 SoC. There are about 25 clock controller
blocks in Exynos7420 out of which support for topc, top0 and peric1 blocks
are added in this initial version of the driver.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

clk: exynos: Add header guard for clk-pll.h

The clk-pll.h is going to be included in multiple files soon. Add
missing header guard to prevent possible build errors in future.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Fixes: 166097e87753 ("clk: exynos: add clock driver for Exynos7420 Soc")
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

clk: exynos: add clock driver for Exynos7420 Soc

Add a clock driver for Exynos7420 SoC. There are about 25 clock controller
blocks in Exynos7420 out of which support for topc, top0 and peric1 blocks
are added in this initial version of the driver.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

SPDX: Convert all of our single license tags to Linux Kernel style

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from. So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry. Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents. There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

clk: exynos: add clock driver for Exynos7420 Soc

Add a clock driver for Exynos7420 SoC. There are about 25 clock controller
blocks in Exynos7420 out of which support for topc, top0 and peric1 blocks
are added in this initial version of the driver.

Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>