[PATCH v3 00/65] clk: Make determine_rate mandatory for muxes

Maxime Ripard
2023-04-04T10:22:19Z

Hi,

This is a follow-up to a previous series that was printing a warning
when a mux has a set_parent implementation but is missing
determine_rate().

The rationale is that set_parent() is very likely to be useful when
changing the rate, but it's determine_rate() that takes the parenting
decision. If we're missing it, then the current parent is always going
to be used, and thus set_parent() will not be used. The only exception
being a direct call to clk_set_parent(), but those are fairly rare
compared to clk_set_rate().

Stephen then asked to promote the warning to an error, and to fix up all
the muxes that are in that situation first. So here it is :)

It was build-tested on x86, arm and arm64.

Affected drivers have been tracked down by the following coccinelle
script:

virtual report

@ clk_ops @
identifier ops;
position p;
@@

struct clk_ops ops@p = {
...
};

@ has_set_parent @
identifier clk_ops.ops;
identifier set_parent_f;
@@

struct clk_ops ops = {
.set_parent = set_parent_f,
};

@ has_determine_rate @
identifier clk_ops.ops;
identifier determine_rate_f;
@@

struct clk_ops ops = {
.determine_rate = determine_rate_f,
};

@ script:python depends on report && has_set_parent && !has_determine_rate @
ops << clk_ops.ops;
set_parent_f << has_set_parent.set_parent_f;
p << clk_ops.p;
@@

coccilib.report.print_report(p[0], "ERROR: %s has set_parent (%s)" % (ops, set_parent_f))

Berlin is the only user still matching after this series has been
applied, but it's because it uses a composite clock which throws the
script off. The driver has been converted and shouldn't be a problem.

Let me know what you think,
Maxime

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
Changes in v3:
- Rebased on top of next-20230404
- Link to v2: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v2-0-f6736dec138e@cerno.tech

Changes in v2:
- Drop all the patches already applied
- Promote the clk registration warning to an error
- Make all muxes use determine_rate
- Link to v1: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v1-0-f3ef80518140@cerno.tech

---
Maxime Ripard (65):
clk: Export clk_hw_forward_rate_request()
clk: lan966x: Remove unused round_rate hook
clk: nodrv: Add a determine_rate hook
clk: test: Add a determine_rate hook
clk: actions: composite: Add a determine_rate hook for pass clk
clk: at91: main: Add a determine_rate hook
clk: at91: sckc: Add a determine_rate hook
clk: berlin: div: Add a determine_rate hook
clk: cdce706: Add a determine_rate hook
clk: k210: pll: Add a determine_rate hook
clk: k210: aclk: Add a determine_rate hook
clk: k210: mux: Add a determine_rate hook
clk: lmk04832: clkout: Add a determine_rate hook
clk: lochnagar: Add a determine_rate hook
clk: qoriq: Add a determine_rate hook
clk: si5341: Add a determine_rate hook
clk: stm32f4: mux: Add a determine_rate hook
clk: vc5: mux: Add a determine_rate hook
clk: vc5: clkout: Add a determine_rate hook
clk: wm831x: clkout: Add a determine_rate hook
clk: davinci: da8xx-cfgchip: Add a determine_rate hook
clk: davinci: da8xx-cfgchip: Add a determine_rate hook
clk: imx: busy: Add a determine_rate hook
clk: imx: fixup-mux: Add a determine_rate hook
clk: imx: scu: Add a determine_rate hook
clk: mediatek: cpumux: Add a determine_rate hook
clk: pxa: Add a determine_rate hook
clk: renesas: r9a06g032: Add a determine_rate hook
clk: socfpga: gate: Add a determine_rate hook
clk: stm32: core: Add a determine_rate hook
clk: tegra: bpmp: Add a determine_rate hook
clk: tegra: super: Add a determine_rate hook
clk: tegra: periph: Add a determine_rate hook
clk: ux500: prcmu: Add a determine_rate hook
clk: ux500: sysctrl: Add a determine_rate hook
clk: versatile: sp810: Add a determine_rate hook
drm/tegra: sor: Add a determine_rate hook
phy: cadence: sierra: Add a determine_rate hook
phy: cadence: torrent: Add a determine_rate hook
phy: ti: am654-serdes: Add a determine_rate hook
phy: ti: j721e-wiz: Add a determine_rate hook
rtc: sun6i: Add a determine_rate hook
ASoC: tlv320aic32x4: Add a determine_rate hook
clk: actions: composite: div: Switch to determine_rate
clk: actions: composite: fact: Switch to determine_rate
clk: at91: smd: Switch to determine_rate
clk: axi-clkgen: Switch to determine_rate
clk: cdce706: divider: Switch to determine_rate
clk: cdce706: clkout: Switch to determine_rate
clk: si5341: Switch to determine_rate
clk: si5351: pll: Switch to determine_rate
clk: si5351: msynth: Switch to determine_rate
clk: si5351: clkout: Switch to determine_rate
clk: da8xx: clk48: Switch to determine_rate
clk: imx: scu: Switch to determine_rate
clk: ingenic: cgu: Switch to determine_rate
clk: ingenic: tcu: Switch to determine_rate
clk: sprd: composite: Switch to determine_rate
clk: st: flexgen: Switch to determine_rate
clk: stm32: composite: Switch to determine_rate
clk: tegra: periph: Switch to determine_rate
clk: tegra: super: Switch to determine_rate
ASoC: tlv320aic32x4: pll: Switch to determine_rate
ASoC: tlv320aic32x4: div: Switch to determine_rate
clk: Forbid to register a mux without determine_rate

drivers/clk/actions/owl-composite.c | 35 +++++++++++-----
drivers/clk/actions/owl-composite.h | 2 +-
drivers/clk/at91/clk-main.c | 3 +-
drivers/clk/at91/clk-smd.c | 29 +++++++------
drivers/clk/at91/sckc.c | 3 +-
drivers/clk/berlin/berlin2-div.c | 3 +-
drivers/clk/clk-axi-clkgen.c | 14 ++++---
drivers/clk/clk-cdce706.c | 31 ++++++++------
drivers/clk/clk-k210.c | 17 +++++---
drivers/clk/clk-lan966x.c | 17 --------
drivers/clk/clk-lmk04832.c | 1 +
drivers/clk/clk-lochnagar.c | 2 +
drivers/clk/clk-qoriq.c | 10 +++--
drivers/clk/clk-si5341.c | 21 +++++-----
drivers/clk/clk-si5351.c | 67 +++++++++++++++++--------------
drivers/clk/clk-stm32f4.c | 3 +-
drivers/clk/clk-versaclock5.c | 8 ++--
drivers/clk/clk-wm831x.c | 3 +-
drivers/clk/clk.c | 15 +++++++
drivers/clk/clk_test.c | 1 +
drivers/clk/davinci/da8xx-cfgchip.c | 15 ++++---
drivers/clk/imx/clk-busy.c | 3 +-
drivers/clk/imx/clk-fixup-mux.c | 3 +-
drivers/clk/imx/clk-scu.c | 27 +++++++++++--
drivers/clk/ingenic/cgu.c | 15 +++----
drivers/clk/ingenic/tcu.c | 19 +++++----
drivers/clk/mediatek/clk-cpumux.c | 3 +-
drivers/clk/pxa/clk-pxa.c | 3 +-
drivers/clk/renesas/r9a06g032-clocks.c | 3 +-
drivers/clk/socfpga/clk-gate.c | 3 +-
drivers/clk/sprd/composite.c | 16 +++++---
drivers/clk/st/clk-flexgen.c | 15 +++----
drivers/clk/stm32/clk-stm32-core.c | 33 ++++++++++-----
drivers/clk/tegra/clk-bpmp.c | 7 +++-
drivers/clk/tegra/clk-periph.c | 19 ++++++---
drivers/clk/tegra/clk-super.c | 18 ++++++---
drivers/clk/ux500/clk-prcmu.c | 3 +-
drivers/clk/ux500/clk-sysctrl.c | 4 +-
drivers/clk/versatile/clk-sp810.c | 3 +-
drivers/gpu/drm/tegra/sor.c | 3 +-
drivers/phy/cadence/phy-cadence-sierra.c | 1 +
drivers/phy/cadence/phy-cadence-torrent.c | 1 +
drivers/phy/ti/phy-am654-serdes.c | 1 +
drivers/phy/ti/phy-j721e-wiz.c | 1 +
drivers/rtc/rtc-sun6i.c | 2 +
sound/soc/codecs/tlv320aic32x4-clk.c | 37 ++++++++++-------
46 files changed, 343 insertions(+), 200 deletions(-)
---
base-commit: 6a53bda3aaf3de5edeea27d0b1d8781d067640b6
change-id: 20221018-clk-range-checks-fixes-2039f3523240

Best regards,
--
Maxime Ripard <maxime@cerno.tech>