linux.git/drivers/mfd, branch v5.9-rc2

Merge tag 'mfd-next-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd

2020-08-15T15:09:38+00:00

Pull MFD updates from Lee Jones:
 "Core Frameworks
   - Make better attempt at matching device with the correct OF node
   - Allow batch removal of hierarchical sub-devices

  New Drivers
   - Add STM32 Clocksource driver
   - Add support for Khadas System Control Microcontroller

  Driver Removal
   - Remove unused driver for TI's SMSC ECE1099

  New Device Support
   - Add support for Intel Emmitsburg PCH to Intel LPSS PCI
   - Add support for Intel Tiger Lake PCH-H to Intel LPSS PCI
   - Add support for Dialog DA revision to Dialog DA9063

  New Functionality
   - Add support for AXP803 to be probed by I2C

  Fix-ups
   - Numerous W=1 warning fixes
   - Device Tree changes (stm32-lptimer, gateworks-gsc, khadas,mcu, stmfx, cros-ec, j721e-system-controller)
   - Enabled Regmap 'fast I/O' in stm32-lptimer
   - Change BUG_ON to WARN_ON in arizona-core
   - Remove superfluous code/initialisation (madera, max14577)
   - Trivial formatting/spelling issues (madera-core, madera-i2c, da9055, max77693-private)
   - Switch to of_platform_populate() in sprd-sc27xx-spi
   - Expand out set/get brightness/pwm macros in lm3533-ctrlbank
   - Disable IRQs on suspend in motorola-cpcap
   - Clean-up error handling in intel_soc_pmic_mrfld
   - Ensure correct removal order of sub-devices in madera
   - Many s/HTTP/HTTPS/ link changes
   - Ensure name used with Regmap is unique in syscon

  Bug Fixes
   - Properly 'put' clock on unbind and error in arizona-core
   - Fix revision handling in da9063
   - Fix 'assignment of read-only location' error in kempld-core
   - Avoid using the Regmap API when atomic in rn5t618
   - Redefine volatile register description in rn5t618
   - Use locking to protect event handler in dln2"

* tag 'mfd-next-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (76 commits)
  mfd: syscon: Use a unique name with regmap_config
  mfd: Replace HTTP links with HTTPS ones
  mfd: dln2: Run event handler loop under spinlock
  mfd: madera: Improve handling of regulator unbinding
  mfd: mfd-core: Add mechanism for removal of a subset of children
  mfd: intel_soc_pmic_mrfld: Simplify the return expression of intel_scu_ipc_dev_iowrite8()
  mfd: max14577: Remove redundant initialization of variable current_bits
  mfd: rn5t618: Fix caching of battery related registers
  mfd: max77693-private: Drop a duplicated word
  mfd: da9055: pdata.h: Drop a duplicated word
  mfd: rn5t618: Make restart handler atomic safe
  mfd: kempld-core: Fix 'assignment of read-only location' error
  mfd: axp20x: Allow the AXP803 to be probed by I2C
  mfd: da9063: Add support for latest DA silicon revision
  mfd: da9063: Fix revision handling to correctly select reg tables
  dt-bindings: mfd: st,stmfx: Remove I2C unit name
  dt-bindings: mfd: ti,j721e-system-controller.yaml: Add J721e system controller
  mfd: motorola-cpcap: Disable interrupt for suspend
  mfd: smsc-ece1099: Remove driver
  mfd: core: Add OF_MFD_CELL_REG() helper
  ...

mfd: syscon: Use a unique name with regmap_config

2020-08-13T06:51:03+00:00

The DT node full name is currently being used in regmap_config
which in turn is used to create the regmap debugfs directories.
This name however is not guaranteed to be unique and the regmap
debugfs registration can fail in the cases where the syscon nodes
have the same unit-address but are present in different DT node
hierarchies. Replace this logic using the syscon reg resource
address instead (inspired from logic used while creating platform
devices) to ensure a unique name is given for each syscon.

Signed-off-by: Suman Anna 
Reviewed-by: Arnd Bergmann 
Signed-off-by: Lee Jones

mfd: Replace HTTP links with HTTPS ones

2020-08-13T06:50:59+00:00

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov 
Acked-by: Rob Herring 
Signed-off-by: Lee Jones

mfd: dln2: Run event handler loop under spinlock

2020-08-13T06:50:56+00:00

The event handler loop must be run with interrupts disabled.
Otherwise we will have a warning:

[ 1970.785649] irq 31 handler lineevent_irq_handler+0x0/0x20 enabled interrupts
[ 1970.792739] WARNING: CPU: 0 PID: 0 at kernel/irq/handle.c:159 __handle_irq_event_percpu+0x162/0x170
[ 1970.860732] RIP: 0010:__handle_irq_event_percpu+0x162/0x170
...
[ 1970.946994] Call Trace:
[ 1970.949446]  
[ 1970.951471]  handle_irq_event_percpu+0x2c/0x80
[ 1970.955921]  handle_irq_event+0x23/0x43
[ 1970.959766]  handle_simple_irq+0x57/0x70
[ 1970.963695]  generic_handle_irq+0x42/0x50
[ 1970.967717]  dln2_rx+0xc1/0x210 [dln2]
[ 1970.971479]  ? usb_hcd_unmap_urb_for_dma+0xa6/0x1c0
[ 1970.976362]  __usb_hcd_giveback_urb+0x77/0xe0
[ 1970.980727]  usb_giveback_urb_bh+0x8e/0xe0
[ 1970.984837]  tasklet_action_common.isra.0+0x4a/0xe0
...

Recently xHCI driver switched to tasklets in the commit 36dc01657b49
("usb: host: xhci: Support running urb giveback in tasklet context").

The handle_irq_event_* functions are expected to be called with interrupts
disabled and they rightfully complain here because we run in tasklet context
with interrupts enabled.

Use a event spinlock to protect event handler from being interrupted.

Note, that there are only two users of this GPIO and ADC drivers and both of
them are using generic_handle_irq() which makes above happen.

Fixes: 338a12814297 ("mfd: Add support for Diolan DLN-2 devices")
Signed-off-by: Andy Shevchenko 
Signed-off-by: Lee Jones

mfd: madera: Improve handling of regulator unbinding

2020-08-13T06:50:54+00:00

The current unbinding process for Madera has some issues. The trouble
is runtime PM is disabled as the first step of the process, but
some of the drivers release IRQs causing regmap IRQ to issue a
runtime get which fails. To allow runtime PM to remain enabled during
mfd_remove_devices, the DCVDD regulator must remain available. In
the case of external DCVDD's this is simple, the regulator can simply
be disabled/put after the call to mfd_remove_devices. However, in
the case of an internally supplied DCVDD the regulator needs to be
released after the other MFD children depending on it.

Use the new MFD mfd_remove_devices_late functionality to split
the DCVDD regulator off from the other drivers.

Signed-off-by: Charles Keepax 
Signed-off-by: Lee Jones

mfd: mfd-core: Add mechanism for removal of a subset of children

2020-08-13T06:50:50+00:00

Currently, the only way to remove MFD children is with a call to
mfd_remove_devices, which will remove all the children. Under
some circumstances it is useful to remove only a subset of the
child devices. For example if some additional clean up is required
between removal of certain child devices.

To accomplish this a level field is added to mfd_cell, the normal
mfd_remove_devices is modified to not remove devices that are set
to a higher level and a corresponding mfd_remove_devices_late
function is added to remove those children.

See further discussion at:
https://lore.kernel.org/lkml/20200616075834.GF2608702@dell/

Suggested-by: Lee Jones 
Signed-off-by: Charles Keepax 
Signed-off-by: Lee Jones

mfd: intel_soc_pmic_mrfld: Simplify the return expression of intel_scu_ipc_dev_iowrite8()

2020-08-13T06:50:05+00:00

Simplify the return expression.

Signed-off-by: Xu Wang 
Signed-off-by: Lee Jones

mfd: max14577: Remove redundant initialization of variable current_bits

2020-08-13T06:50:04+00:00

The variable current_bits is being initialized with a value that is
never read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King 
Reviewed-by: Krzysztof Kozlowski 
Signed-off-by: Lee Jones

mfd: rn5t618: Fix caching of battery related registers

2020-08-13T06:50:02+00:00

Battery status changes dynamically, so the corresponding registers
need to be considered volatile. Affected registers are:

 - fuel gauge
 - battery status
 - battery interrupt

Signed-off-by: Andreas Kemnade 
Signed-off-by: Lee Jones

mfd: rn5t618: Make restart handler atomic safe

2020-08-13T06:49:56+00:00

The restart handler is executed during the shutdown phase which is
atomic/irq-less. The i2c framework supports atomic transfers since
commit 63b96983a5dd ("i2c: core: introduce callbacks for atomic
transfers") to address this use case. Using i2c regmap in that
situation is not allowed:

[  165.177465] [ BUG: Invalid wait context ]
[  165.181479] 5.8.0-rc3-00003-g0e9088558027-dirty #11 Not tainted
[  165.187400] -----------------------------
[  165.191410] systemd-shutdow/1 is trying to lock:
[  165.196030] d85b4438 (rn5t618:170:(&rn5t618_regmap_config)->lock){+.+.}-{3:3}, at: regmap_update_bits_base+0x30/0x70
[  165.206573] other info that might help us debug this:
[  165.211625] context-{4:4}
[  165.214248] 2 locks held by systemd-shutdow/1:
[  165.218691]  #0: c131c47c (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x90/0x204
[  165.227405]  #1: c131efb4 (rcu_read_lock){....}-{1:2}, at: __atomic_notifier_call_chain+0x0/0x118
[  165.236288] stack backtrace:
[  165.239174] CPU: 0 PID: 1 Comm: systemd-shutdow Not tainted 5.8.0-rc3-00003-g0e9088558027-dirty #11
[  165.248220] Hardware name: Freescale i.MX6 SoloLite (Device Tree)
[  165.254330] [] (unwind_backtrace) from [] (show_stack+0x10/0x14)
[  165.262084] [] (show_stack) from [] (dump_stack+0xe8/0x120)
[  165.269407] [] (dump_stack) from [] (__lock_acquire+0x81c/0x2ca0)
[  165.277246] [] (__lock_acquire) from [] (lock_acquire+0xe4/0x490)
[  165.285090] [] (lock_acquire) from [] (__mutex_lock+0x74/0x954)
[  165.292756] [] (__mutex_lock) from [] (mutex_lock_nested+0x1c/0x24)
[  165.300769] [] (mutex_lock_nested) from [] (regmap_update_bits_base+0x30/0x70)
[  165.309741] [] (regmap_update_bits_base) from [] (rn5t618_trigger_poweroff_sequence+0x34/0x64)
[  165.320097] [] (rn5t618_trigger_poweroff_sequence) from [] (rn5t618_restart+0xc/0x2c)
[  165.329669] [] (rn5t618_restart) from [] (notifier_call_chain+0x48/0x80)
[  165.338113] [] (notifier_call_chain) from [] (__atomic_notifier_call_chain+0x70/0x118)
[  165.347770] [] (__atomic_notifier_call_chain) from [] (atomic_notifier_call_chain+0x18/0x20)
[  165.357949] [] (atomic_notifier_call_chain) from [] (machine_restart+0x68/0x80)
[  165.367001] [] (machine_restart) from [] (__do_sys_reboot+0x11c/0x204)
[  165.375272] [] (__do_sys_reboot) from [] (ret_fast_syscall+0x0/0x28)
[  165.383364] Exception stack(0xd80a5fa8 to 0xd80a5ff0)
[  165.388420] 5fa0:                   00406948 00000000 fee1dead 28121969 01234567 73299b00
[  165.396602] 5fc0: 00406948 00000000 00000000 00000058 be91abc8 00000000 be91ab60 004056f8
[  165.404781] 5fe0: 00000058 be91aabc b6ed4d45 b6e56746

Signed-off-by: Andreas Kemnade 
Signed-off-by: Lee Jones