clk: qcom: regmap-mux: fix parent clock lookup

The function mux_get_parent() uses qcom_find_src_index() to find the
parent clock index, which is incorrect: qcom_find_src_index() uses src
enum for the lookup, while mux_get_parent() should use cfg field (which
corresponds to the register value). Add qcom_find_cfg_index() function
doing this kind of lookup and use it for mux parent lookup.

Fixes: df964016490b ("clk: qcom: add parent map for regmap mux")
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20211115233407.1046179-1-dmitry.baryshkov@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: common: Make use of the helper function devm_platform_ioremap_resource()

Use the devm_platform_ioremap_resource() helper instead of
calling platform_get_resource() and devm_ioremap_resource()
separately

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Link: https://lore.kernel.org/r/20210907084851.4050-1-caihuoqing@baidu.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: Allow constant ratio freq tables for rcg

Some RCGs (the gfx_3d_src_clk in msm8998 for example) are basically just
some constant ratio from the input across the entire frequency range. It
would be great if we could specify the frequency table as a single entry
constant ratio instead of a long list, ie:

{ .src = P_GPUPLL0_OUT_EVEN, .pre_div = 3 },
{ }

So, lets support that.

We need to fix a corner case in qcom_find_freq() where if the freq table
is non-null, but has no frequencies, we end up returning an "entry" before
the table array, which is bad. Then, we need ignore the freq from the
table, and instead base everything on the requested freq.

Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lkml.kernel.org/r/20191031185715.15504-1-jeffrey.l.hugo@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: common: Return NULL from clk_hw OF provider

Return NULL in the cases where the clk_hw is not registered with the
clock provider, but the clock consumer still requests for a clock id.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/20191014102308.27441-3-tdas@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: define probe by index API as common API

Extend the probe by index API in common code to be used
by other qcom clock controller.

Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: Make common clk_hw registrations

Several clock controller drivers define a list of clk_hw devices, and then
register those devices in probe() before using common code to process the
rest of initialization. Extend the common code to accept a list of clk_hw
devices to process, thus eliminating many duplicate implementations.

Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Tested-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: Support 'protected-clocks' property

Certain firmware configurations "protect" clks and cause the entire
system to reboot when a non-secure OS such as Linux tries to read or
write protected clk registers. But other firmware configurations allow
reading or writing the same registers, and they may actually require
that the OS use the otherwise locked down clks. Support the
'protected-clocks' property by never registering these protected clks
with the common clk framework. This way, when firmware is protecting
these clks we won't have the chance to ever read or write these
registers and take down the entire system.

Cc: Taniya Das <tdas@codeaurora.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: Update SPDX headers for common files

SPDX headers updated for common/branch/pll/regmap files.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: Register the gdscs before the clocks

We have atleast some instances of ALWAYS_ON gdscs, which need to
be turned ON *before* some clocks within the gdsc domain marked
with a CLK_IS_CRITICAL can be turned ON.
To facilitate this sequence, register the GDCSs (and hence handle
the ALWAYS_ON gdscs) before we register clocks (and handle the
clocks marked as CLK_IS_CRITICAL)

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: qcom: common: fix legacy board-clock registration

Make sure to search only the child nodes of "/clocks", rather than the
whole device-tree depth-first starting at "/clocks" when determining
whether to register a fixed clock in the legacy board-clock registration
helper.

Fixes: ee15faffef11 ("clk: qcom: common: Add API to register board clocks backwards compatibly")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: common: Migrate to devm_* APIs for resets and clk providers

Now that we have devm APIs for the reset controller and of clk hw
provider APIs we can remove the custom code here.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

scripts/spelling.txt: add regsiter -> register spelling mistake

This typo is quite common. Fix it and add it to the spelling file so
that checkpatch catches it earlier.

Link: http://lkml.kernel.org/r/20170317011131.6881-2-sboyd@codeaurora.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

clk: qcom: Do not drop device node twice

of_find_node_by_name() drops the reference to a passed device node.
It is not necessary to drop it again, and doing so may result in the
device node being released prematurely.

Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Fixes: ee15faffef11 ("clk: qcom: common: Add API to register board clocks backwards compatibly")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Add rcg ops to return floor value closest to the requested rate

The default behaviour with clk_rcg2_ops is for the
clk_round_rate()/clk_set_rate() to return/set a ceil clock
rate closest to the requested rate by looking up the corresponding
frequency table.
However, we do have some instances (mainly sdcc on various platforms)
of clients expecting a clk_set_rate() to set a floor value instead.
Add a new clk_rcg2_floor_ops to handle this for such specific
rcg instances

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Always add factor clock for xo clocks

Currently the RPM/RPM-SMD clock drivers do not register the xo clocks,
so we should always add factor clock. When we later add xo clocks support
into the drivers, we should update this function to skip registration.
By doing so we avoid any DT dependencies.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Enable FSM mode for votable alpha PLLs

The votable alpha PLLs need to have the fsm mode enabled as part
of the initialization. The sequence seems to be the same as used
by clk-pll, so move the function which does this into a common
place and reuse it for the clk-alpha-pll

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Migrate to clk_hw based registration and OF APIs

Now that we have clk_hw based provider APIs to register clks, we
can get rid of struct clk pointers in this driver, allowing us to
move closer to a clear split of consumer and provider clk APIs.

Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Remove CLK_IS_ROOT

This flag is a no-op now. Remove usage of the flag.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: gdsc: Add support for hierarchical power domains

Some qcom SoCs' can have hierarchical power domains. Let the gdsc structs
specify the parents (if any) and the driver add genpd subdomains for them.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: common: check for failure

We were not checking the return from devm_add_action() which can fail.
Start using the helper and devm_add_action_or_reset() and return
directly as we know that the cleanup has been done by this helper.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: common: Add API to register board clocks backwards compatibly

We want to put the XO board clocks into the dt files, but we also
need to be backwards compatible with an older dtb. Add an API to
the common code to do this. This also makes a place for us to
handle the case when the RPM clock driver is enabled and we don't
want to register the fixed factor clock.

Cc: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Drop calls to qcom_cc_remove()

Now that qcom_cc_remove() is a nop, drop calls to
qcom_cc_remove() and any empty driver remove functions.

Cc: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

qcom: clk: Make qcom_cc_probe() fully devm safe

Some APIs in qcom_cc_probe() don't have a devm counterpart, so we
have to use the calling device's platform data to pass pointers
to the remove path. Let's use devm_add_action() instead, so that
the remove path doesn't need to do anything, allowing us to
remove qcom_cc_remove() entirely.

Cc: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: gdsc: Add support for ON only state

Certain devices can have GDSCs' which support ON as the only state.
They can't be power collapsed to either hit RET or OFF.
The clients drivers for these GDSCs' however would expect the state
of the core to be reset following a GDSC disable and re-enable.
To do this assert/deassert reset lines every time the client
driver would request the GDSC to be powered on/off instead.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: gdsc: Prepare common clk probe to register gdscs

The common clk probe registers a clk provider and a reset controller.
Update it to register a genpd provider using the gdsc data provided
by each platform.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: Replace __clk_get_num_parents with clk_hw_get_num_parents()

Mostly converted with the following semantic patch:

@@
struct clk_hw *E;
@@

-__clk_get_num_parents(E->clk)
+clk_hw_get_num_parents(E)

Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Cc: Chao Xie <chao.xie@marvell.com>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: "Emilio López" <emilio@elopez.com.ar>
Acked-by: Tero Kristo <t-kristo@ti.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Give clk-qcom.ko module a GPLv2 license

The missing license causes the clk-qcom.ko module to taint the
kernel. Add the appropriate license to avoid taint.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Introduce parent_map tables

In the current parent mapping code, we can get duplicate or inconsistent
indexes, which leads to discrepancy between the number of elements in the
array and the number of parents. Until now, this was solved with some
reordering but this is not always possible.

This patch introduces index tables that are used to define the relations
between the PLL source and the hardware mux configuration value.
To accomplish this, here we do the following:
- Define a parent_map struct to map the relations between PLL source index
and register configuration value.
- Add a qcom_find_src_index() function for finding the index of a clock
matching the specific PLL configuration.
- Update the {set,get}_parent RCG functions use the newly introduced
parent_map struct.
- Convert all existing drivers to the new parent_map tables.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Consolidate frequency finding logic

There are two find_freq() functions in clk-rcg.c and clk-rcg2.c
that are almost exactly the same. Consolidate them into one
function to save on some code space.

Cc: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Fix PLL rate configurations

Sometimes we need to program PLLs with a fixed rate
configuration during driver probe. Doing this after we register
the PLLs with the clock framework causes the common clock
framework to assume the rate of the PLLs are 0. This causes all
sorts of problems for rate recalculations because the common
clock framework caches the rate once at registration time unless
a flag is set to always recalculate the rates.

Split the qcom_cc_probe() function into two pieces, map and
everything else, so that drivers which need to configure some
PLL rates or otherwise twiddle bits in the clock controller can
do so before registering clocks. This allows us to properly
detect the rates of PLLs that are programmed at boot.

Fixes: 49fc825f0cc2 "clk: qcom: Consolidate common probe code"
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

clk: qcom: Return error pointers for unimplemented clocks

Not all clocks are implemented but client drivers can still
request them. Currently we will return a NULL pointer to them if
the clock isn't implemented in software but NULL pointers are
valid clock pointers. Return an error pointer so that driver's
don't proceed without a clock they may actually need.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

clk: qcom: Consolidate common probe code

Most of the probe code is the same between all the different
clock controllers. Consolidate the code into a common.c file.
This makes changes to the common probe parts easier and reduces
chances for bugs.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>