Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux

Pull clk updates from Stephen Boyd:
 "We have one small patch to the clk core this time around. It fixes a
  corner case with the CLK_OPS_PARENT_ENABLE flag combined with
  clk_core_is_enabled() where it hangs the system. We'll simply assume
  the clk is disabled if the parent is disabled and the flag is set.
  Trying to turn on the parent to check the enable state of the clk runs
  into system hangs at boot. We let this bake in -next for a couple
  weeks to make sure there aren't any more issues because the last
  attempt to fix this ran into hangs and had to be reverted.

  Note: There were some more patches to the core framework around
  sync_state and disabling unused clks, but I asked for that to be
  reverted from the qcom PR because it isn't ready and we're still
  discussing the best solution on the list.

  Outside of the core clk framework, we have the usual collection of clk
  driver updates and support for new SoCs (which seems to never stop).
  The dirstat is dominated by Qualcomm because they added support for
  quite a few SoCs this time around and also migrated quite a few of
  their drivers to clk_parent_data. The other big diff is in the
  Mediatek clk drivers that saw a significant rework this cycle to
  similarly modernize the code, and we'll see that work continue in the
  next cycle as well. Nothing really jumps out as scary here, except
  that the significant churn in parent data descriptions can have typos
  that go unnoticed. More details below.

  Core:
   - Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()

  New Drivers:
   - Add a new clk-gpr-mux clock type and use it on i.MX6Q to add ENET
     ref clocks
   - Support for Mediatek MT7891 SoC clks
   - Support for many Qualcomm clk controllers:
      - QDU1000/QRU1000 global clock controller
      - SA8775P global clock controller
      - SM8550 TCSR and display clock controller
      - SM6350 clock controller
      - MSM8996 CBF and APCS clock controllers

  Updates:
   - Various cleanups and improvements to Mediatek clk drivers to reduce
     code size and modernize the drivers
   - Support for Versa 5P49V60 clks
   - Disable R-Car H3 ES1.*, as it was only available to an internal
     development group and needed a lot of quirks and workarounds
   - Add PWM, Compare-Match Timer (TIM), USB, SDHI, and eMMC clocks and
     resets on Renesas RZ/V2M
   - Add display clocks on Renesas R-Car V4H
   - Add Camera Receiving Unit (CRU) clocks and resets on Renesas RZ/G2L
   - Free the imx_uart_clocks even if imx_register_uart_clocks returns
     early
   - Get the stdout clocks count from device tree on i.MX
   - Drop the clock count argument from imx_register_uart_clocks()
   - Keep the uart clocks on i.MX93 for when earlycon is used
   - Fix SPDX comment in i.MX6SLL clocks bindings header
   - Drop some unnecessary spaces from i.MX8ULP clocks bindings header
   - Add imx_obtain_fixed_of_clock() for allowing to add a clock that is
     not configured via devicetree
   - Fix the ENET1 gate configuration for i.MX6UL according to the
     reference manual
   - Add ENET refclock mux support for i.MX6UL
   - Add support for USB host/device configuration on Renesas RZ/N1
   - Add PLL2 programming support, and CAN-FD clocks on Renesas R-Car
     V4H
   - Add D1 CAN bus gates and resets for Allwinner
   - Mark D1 CPUX clock as critical on Allwinner
   - Reuse D1 driver for Allwinner R528/T113
   - Cleanup sunxi-ng Kconfig
   - Fix sunxi-ng kernel-doc issues
   - Model Allwinner H3/H5 DRAM clock as fixed clock
   - Use .determine_rate() instead of .round_rate() for the dualdiv,
     mpll, sclk-div and cpu-dyn-div amlogic clock drivers
   - DDR clocks were marked as critical in the proper clock driver for
     each AT91 SoC such that drivers/memory/atmel-sdramc.c to be deleted
     in the next releases as it only does clock enablement
   - Patch to avoid compiling dt-compat.o for all AT91 SoCs as only some
     of them may use it
   - Support synchronous power_off requests in the qcom GDSC driver for
     proper GPU power collapse
   - Drop test clocks from various Qualcomm clk drivers
   - Update parent references to use clk_parent_data/clk_hw in various
     Qualcomm clk drivers
   - Fixes for the Qualcomm MSM8996 CPU clock controller
   - Transition Qualcomm MSM8974 GCC off the externally defined
     sleep_clk
   - Add GDSCs in the global clock controller for Qualcomm QCS404
   - The SDCC core clocks on Qualcomm SM6115 are moved to floor_ops
   - Programming of clk_dis_wait for GPU CX GDSC on Qualcomm SC7180 and
     SDM845 are moved to use the recently introduced properties in the
     GDSC struct
   - Qualcomm's RPMh clock driver gains SM8550 and SA8775P clocks, and
     the IPA clock is added on a variety of platforms
   - De-duplicate identical clks in Qualcomm SMD RPM clk driver
   - Add a few missing clocks across msm8998, msm8992, msm8916, qcs404
     to Qualcomm SDM RPM clk driver
   - Various Qualcomm clk drivers use devm_pm_runtime_enable() to
     simplify"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (228 commits)
  clk: qcom: apcs-msm8986: Include bitfield.h for FIELD_PREP
  clk: qcom: Revert sync_state based clk_disable_unused
  clk: imx: pll14xx: fix recalc_rate for negative kdiv
  clk: rs9: Drop unused pin_xin field
  MAINTAINERS: clk: imx: Add Peng Fan as reviewer
  clk: sprd: Add dependency for SPRD_UMS512_CLK
  clk: ralink: fix 'mt7621_gate_is_enabled()' function
  clk: mediatek: clk-mtk: Remove unneeded semicolon
  dt-bindings: clock: remove stih416 bindings
  dt-bindings: clock: add loongson-2 clock
  dt-bindings: clock: add loongson-2 clock include file
  clk: imx: fix compile testing imxrt1050
  clk: Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()
  clk: imx: set imx_clk_gpr_mux_ops storage-class-specifier to static
  clk: renesas: rcar-gen3: Disable R-Car H3 ES1.*
  dt-bindings: clock: Merge qcom,gpucc-sm8350 into qcom,gpucc.yaml
  clk: qcom: gpucc-sdm845: fix clk_dis_wait being programmed for CX GDSC
  clk: qcom: gpucc-sc7180: fix clk_dis_wait being programmed for CX GDSC
  dt-bindings: clock: qcom,sa8775p-gcc: add the power-domains property
  clk: qcom: cpu-8996: add missing cputype include
  ...

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f6d7c6a9a654..ae07685c7588 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -244,6 +244,17 @@ static bool clk_core_is_enabled(struct clk_core *core)
 		}
 	}
 
+	/*
+	 * This could be called with the enable lock held, or from atomic
+	 * context. If the parent isn't enabled already, we can't do
+	 * anything here. We can also assume this clock isn't enabled.
+	 */
+	if ((core->flags & CLK_OPS_PARENT_ENABLE) && core->parent)
+		if (!clk_core_is_enabled(core->parent)) {
+			ret = false;
+			goto done;
+		}
+
 	ret = core->ops->is_enabled(core->hw);
 done:
 	if (core->rpm_enabled)