linux-toradex.git/drivers/soc/samsung, branch master

soc: samsung: exynos-chipid: add google,gs101-otp support

2025-12-28T11:31:38+00:00

GS101 is different (but also e850 and autov9 I assume) from the SoCs
that are currently handled by the exynos-chipid driver because the
chip ID info is part of the OTP registers. GS101 OTP has a clock, an
interrupt line, a register space (that contains product and chip ID,
TMU data, ASV, etc) and a 32Kbit memory space that can be
read/program/locked with specific commands. On GS101 the "ChipID block"
is just an abstraction, it's not a physical device. When the power-on
sequence progresses, the OTP chipid values are loaded to the OTP
registers.

Add the GS101 chip ID support. The support is intentionally added in the
exynos-chipid driver, and not in a dedicated Exynos OTP driver, because
we estimate that there will not be any OTP consumers in the kernel other
than the chip ID/SoC interface. The downstream GS101 drivers confirm
this supposition.

Signed-off-by: Tudor Ambarus 
Reviewed-by: André Draszik 
Link: https://patch.msgid.link/20251222-gs101-chipid-v4-4-aa8e20ce7bb3@linaro.org
Signed-off-by: Krzysztof Kozlowski

soc: samsung: exynos-chipid: downgrade dev_info to dev_dbg for soc info

2025-12-28T11:31:38+00:00

The SoC information is exposed to userspace using the standard soc
interface. Downgrade to dev_dbg to stop polluting the console log.

Signed-off-by: Tudor Ambarus 
Reviewed-by: André Draszik 
Link: https://patch.msgid.link/20251222-gs101-chipid-v4-3-aa8e20ce7bb3@linaro.org
Signed-off-by: Krzysztof Kozlowski

soc: samsung: exynos-chipid: rename method

2025-12-28T11:31:37+00:00

s/product_id_to_soc_id/exynos_product_id_to_name.
Prepend exynos_ to avoid name space pollution. The method translates the
product id to a name, rename the method to make that clear. While
touching the code where it is called, add a blank line for readability
purposes.

Signed-off-by: Tudor Ambarus 
Reviewed-by: André Draszik 
Link: https://patch.msgid.link/20251222-gs101-chipid-v4-2-aa8e20ce7bb3@linaro.org
Signed-off-by: Krzysztof Kozlowski

soc: samsung: exynos-chipid: use dev_err_probe where appropiate

2025-12-21T13:36:36+00:00

Use dev_err_probe() to benefit of the standardized format of the error
code (e.g. "ENODEV" instead of -19), to get meanigful error messages, and
for more compact error paths.

Signed-off-by: Tudor Ambarus 
Reviewed-by: André Draszik 
Link: https://patch.msgid.link/20251120-gs101-chipid-v3-2-1aeaa8b7fe35@linaro.org
Signed-off-by: Krzysztof Kozlowski

soc: samsung: exynos-chipid: use devm action to unregister soc device

2025-12-21T13:36:36+00:00

Simplify the unwinding of the soc device by using a devm action.
Add the action before the exynos_asv_init() to avoid an explicit call
to soc_device_unregister().

Signed-off-by: Tudor Ambarus 
Reviewed-by: André Draszik 
Link: https://patch.msgid.link/20251120-gs101-chipid-v3-1-1aeaa8b7fe35@linaro.org
Signed-off-by: Krzysztof Kozlowski

Merge tag 'soc-drivers-6.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

2025-12-06T01:47:59+00:00

Pull more SoC driver updates from Arnd Bergmann:
 "These updates came a little late, or were based on a later 6.18-rc tag
  than the others:

   - A new driver for cache management on cxl devices with memory shared
     in a coherent cluster. This is part of the drivers/cache/ tree, but
     unlike the other drivers that back the dma-mapping interfaces, this
     one is needed only during CPU hotplug.

   - A shared branch for reset controllers using swnode infrastructure

   - Added support for new SoC variants in the Amlogic soc_device
     identification

   - Minor updates in Freescale, Microchip, Samsung, and Apple SoC
     drivers"

* tag 'soc-drivers-6.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (24 commits)
  soc: samsung: exynos-pmu: fix device leak on regmap lookup
  soc: samsung: exynos-pmu: Fix structure initialization
  soc: fsl: qbman: use kmalloc_array() instead of kmalloc()
  soc: fsl: qbman: add WQ_PERCPU to alloc_workqueue users
  MAINTAINERS: Update email address for Christophe Leroy
  MAINTAINERS: refer to intended file in STANDALONE CACHE CONTROLLER DRIVERS
  cache: Support cache maintenance for HiSilicon SoC Hydra Home Agent
  cache: Make top level Kconfig menu a boolean dependent on RISCV
  MAINTAINERS: Add Jonathan Cameron to drivers/cache and add lib/cache_maint.c + header
  arm64: Select GENERIC_CPU_CACHE_MAINTENANCE
  lib: Support ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
  soc: amlogic: meson-gx-socinfo: add new SoCs id
  dt-bindings: arm: amlogic: meson-gx-ao-secure: support more SoCs
  memregion: Support fine grained invalidate by cpu_cache_invalidate_memregion()
  memregion: Drop unused IORES_DESC_* parameter from cpu_cache_invalidate_memregion()
  dt-bindings: cache: sifive,ccache0: add a pic64gx compatible
  MAINTAINERS: rename Microchip RISC-V entry
  MAINTAINERS: add new soc drivers to Microchip RISC-V entry
  soc: microchip: add mfd drivers for two syscon regions on PolarFire SoC
  dt-bindings: soc: microchip: document the simple-mfd syscon on PolarFire SoC
  ...

soc: samsung: exynos-pmu: fix device leak on regmap lookup

2025-11-27T15:55:38+00:00

Make sure to drop the reference taken when looking up the PMU device and
its regmap.

Note that holding a reference to a device does not prevent its regmap
from going away so there is no point in keeping the reference.

Fixes: 0b7c6075022c ("soc: samsung: exynos-pmu: Add regmap support for SoCs that protect PMU regs")
Cc: stable@vger.kernel.org	# 6.9
Cc: Peter Griffin 
Signed-off-by: Johan Hovold 
Link: https://patch.msgid.link/20251121121852.16825-1-johan@kernel.org
Signed-off-by: Krzysztof Kozlowski

soc: samsung: exynos-pmu: Fix structure initialization

2025-11-27T15:02:59+00:00

Commit 78b72897a5c8 ("soc: samsung: exynos-pmu: Enable CPU Idle for
gs101") added system wide suspend/resume callbacks to Exynos PMU driver,
but some items used by these callbacks are initialized only on
GS101-compatible boards. Move that initialization to exynos_pmu_probe()
to avoid potential lockdep warnings like below observed during system
suspend/resume cycle:

INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 2134 Comm: rtcwake Not tainted 6.18.0-rc7-next-20251126-00039-g1d656a1af243 #11794 PREEMPT
Hardware name: Samsung Exynos (Flattened Device Tree)
Call trace:
 unwind_backtrace from show_stack+0x10/0x14
 show_stack from dump_stack_lvl+0x68/0x88
 dump_stack_lvl from register_lock_class+0x970/0x988
 register_lock_class from __lock_acquire+0xc8/0x29ec
 __lock_acquire from lock_acquire+0x134/0x39c
 lock_acquire from _raw_spin_lock+0x38/0x48
 _raw_spin_lock from exynos_cpupm_suspend_noirq+0x18/0x34
 exynos_cpupm_suspend_noirq from dpm_run_callback+0x98/0x2b8
 dpm_run_callback from device_suspend_noirq+0x8c/0x310

Fixes: 78b72897a5c8 ("soc: samsung: exynos-pmu: Enable CPU Idle for gs101")
Signed-off-by: Marek Szyprowski 
Link: https://patch.msgid.link/20251126110038.3326768-1-m.szyprowski@samsung.com
[krzk: include calltrace into commit msg]
Signed-off-by: Krzysztof Kozlowski

soc: samsung: exynos-chipid: use a local dev variable

2025-11-03T10:02:01+00:00

Use a local variable for struct device to avoid dereferencing.

Signed-off-by: Tudor Ambarus 
Link: https://patch.msgid.link/20251031-gs101-chipid-v1-2-d78d1076b210@linaro.org
Signed-off-by: Krzysztof Kozlowski

soc: samsung: gs101-pmu: implement access tables for read and write

2025-10-18T17:16:45+00:00

Accessing non-existent PMU registers causes an SError, halting the
system.

Implement read and write access tables for the gs101-PMU to specify
which registers are read- and/or writable to avoid that SError.

Reviewed-by: Sam Protsenko 
Signed-off-by: André Draszik 
Link: https://patch.msgid.link/20251009-gs101-pmu-regmap-tables-v2-3-2d64f5261952@linaro.org
Signed-off-by: Krzysztof Kozlowski