[PATCH v3 00/17] Add support for Mobileye EyeQ5 system controller

Théo Lebrun
2024-01-23T18:47:09Z

Hi,

The goal of this series is to add clk, reset and pinctrl support for the
Mobileye EyeQ5 platform [0]. Control of those is grouped inside a
system controller block called "OLB".

About clocks, we replaced the 10 fixed clocks from the initial platform
support series [0] by 10 read-only fixed-factor PLLs provided by our
clock driver. We also provide one table-based divider clock for OSPI.
Two PLLs (for GIC timer & UARTs) are required at of_clk_init() so those
are registered first, the rest comes at platform device probe.

Resets are split in three domains, all dealt with by the same device.
They have some behavior differences:
- We busy-wait on the first two for hardware LBIST reasons (logic
built-in self-test).
- Domains 0 & 2 work in a bit-per-reset fashion while domain 1 works in
a register-per-reset fashion.

Pin control is about controlling bias, drive strength and muxing. The
latter allows two functions per pin; the first function is always GPIO
while the second one is pin-dependent. There exists two banks, each
handled in a separate driver instance. Each pin maps to one pin group.
That makes pin & group indexes the same, simplifying logic.

This series inherits from the clk V2 [1], reset V1 [2] and pinctrl V1
[3]. Those were unified to simplify handling of dt-bindings. It is
based on the series "[PATCH v6 00/15] Add support for the Mobileye
EyeQ5 SoC" [0] rebased onto v6.8-rc1.

Here is the patch list, split by subsystems:

- clk:
- [PATCH V3 01/17] clk: fixed-factor: add optional accuracy support
- [PATCH V3 02/17] clk: fixed-factor: add fwname-based constructor functions
- [PATCH V3 05/17] dt-bindings: clock: mobileye,eyeq5-clk: add bindings
- [PATCH V3 08/17] clk: eyeq5: add platform driver

- pinctrl:
- [PATCH V3 03/17] dt-bindings: pinctrl: allow pin controller device without unit address
- [PATCH V3 07/17] dt-bindings: pinctrl: mobileye,eyeq5-pinctrl: add bindings
- [PATCH V3 10/17] pinctrl: eyeq5: add platform driver

- MIPS: (note: dependent on the [0] series)
- [PATCH V3 04/17] dt-bindings: soc: mobileye: add EyeQ5 OLB system controller
- [PATCH V3 11/17] MIPS: mobileye: eyeq5: rename olb@e00000 to system-controller@e00000
- [PATCH V3 12/17] MIPS: mobileye: eyeq5: remove reg-io-width property from OLB syscon
- [PATCH V3 13/17] MIPS: mobileye: eyeq5: use OLB clocks controller
- [PATCH V3 14/17] MIPS: mobileye: eyeq5: add OLB reset controller node
- [PATCH V3 15/17] MIPS: mobileye: eyeq5: add reset properties to uarts
- [PATCH V3 16/17] MIPS: mobileye: eyeq5: add pinctrl nodes & pinmux function nodes
- [PATCH V3 17/17] MIPS: mobileye: eyeq5: add pinctrl properties to UART nodes

- reset:
- [PATCH V3 06/17] dt-bindings: reset: mobileye,eyeq5-reset: add bindings
- [PATCH V3 09/17] reset: eyeq5: add platform driver

Thanks to Krzysztof, Rob & Stephen for the previous feedback!

Have a nice day,
Théo Lebrun

[0]: https://lore.kernel.org/lkml/20240118155252.397947-1-gregory.clement@bootlin.com/
[1]: https://lore.kernel.org/lkml/20231227-mbly-clk-v2-0-a05db63c380f@bootlin.com/
[2]: https://lore.kernel.org/lkml/20231218-mbly-reset-v1-0-b4688b916213@bootlin.com/
[3]: https://lore.kernel.org/lkml/20231218-mbly-pinctrl-v1-0-2f7d366c2051@bootlin.com/

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
---
Changes in v3:
- Unified the three series into one.
- clk: split driver into two for clocks registered at of_clk_init() and
clocks registered at platform device probe.
- reset/bindings: drop reset dt-bindings header & add comment in driver
to document known valid resets in each domain.
- pinctrl/bindings: fix pinctrl.yaml to allow non unit addresses for pin
controller devices.
- all/bindings: remove possibility to use `mobileye,olb` phandle to get
syscon. All three drivers use their parent node as syscon/regmap.
- MIPS/bindings: fix bindings for OLB. Have single example in parent,
removing all examples in child.
- all: drop the "probed" logs.
- Link to v2: https://lore.kernel.org/r/20231227-mbly-clk-v2-0-a05db63c380f@bootlin.com

Changes in v2:
- Drop [PATCH 1/5] that was taken by Stephen for clk-next.
- Add accuracy support to fixed-factor that is enabled with a flag.
Register prototypes were added to exploit this feature.
- Add fw_name support to fixed-factor. This allows pointing to parent
clocks using the value in `clock-names` in the DT. Register
prototypes were added for that.
- Bindings were modified to be less dumb: a binding was added for OLB
and the clock-controller is a child property of it. Removed the
possibility of pointing to OLB using a phandle. $nodename is the
generic `clock-controller` and not custom `clocks`. Fix dt-bindings
examples.
- Fix commit message for the driver patch. Add details, remove useless
fluff.
- Squash both driver commits together.
- Declare a platform_driver instead of using CLK_OF_DECLARE_DRIVER. This
also means using `dev_*` for logging, removing `pr_fmt`. We add a
pointer to device in the private structure.
- Use fixed-factor instead of fixed-rate for PLLs. We don't grab a
reference to the parent clk, instead using newly added fixed-factor
register prototypes and fwname.
- NULL is not an error when registering PLLs anymore.
- Now checking the return value of of_clk_add_hw_provider for errors.
- Fix includes.
- Remove defensive conditional at start of eq5c_pll_parse_registers.
- Rename clk_hw_to_ospi_priv to clk_to_priv to avoid confusion: it is
not part of the clk_hw_* family of symbols.
- Fix negative returns in eq5c_ospi_div_set_rate. It was a typo
highlighted by Stephen Boyd.
- Declare eq5c_ospi_div_ops as static.
- In devicetree, move the OLB node prior to the UARTs, as platform
device probe scheduling is dependent on devicetree ordering. This is
required to declare the driver as a platform driver, else it
CLK_OF_DECLARE_DRIVER is required.
- In device, create a core0-timer-clk fixed clock to feed to the GIC
timer. It requires a clock earlier than platform bus type init.
- Link to v1: https://lore.kernel.org/r/20231218-mbly-clk-v1-0-44ce54108f06@bootlin.com

---
Théo Lebrun (17):
clk: fixed-factor: add optional accuracy support
clk: fixed-factor: add fwname-based constructor functions
dt-bindings: pinctrl: allow pin controller device without unit address
dt-bindings: soc: mobileye: add EyeQ5 OLB system controller
dt-bindings: clock: mobileye,eyeq5-clk: add bindings
dt-bindings: reset: mobileye,eyeq5-reset: add bindings
dt-bindings: pinctrl: mobileye,eyeq5-pinctrl: add bindings
clk: eyeq5: add platform driver
reset: eyeq5: add platform driver
pinctrl: eyeq5: add platform driver
MIPS: mobileye: eyeq5: rename olb@e00000 to system-controller@e00000
MIPS: mobileye: eyeq5: remove reg-io-width property from OLB syscon
MIPS: mobileye: eyeq5: use OLB clocks controller
MIPS: mobileye: eyeq5: add OLB reset controller node
MIPS: mobileye: eyeq5: add reset properties to uarts
MIPS: mobileye: eyeq5: add pinctrl nodes & pinmux function nodes
MIPS: mobileye: eyeq5: add pinctrl properties to UART nodes

.../bindings/clock/mobileye,eyeq5-clk.yaml | 41 ++
.../bindings/pinctrl/mobileye,eyeq5-pinctrl.yaml | 77 +++
.../devicetree/bindings/pinctrl/pinctrl.yaml | 18 +-
.../bindings/reset/mobileye,eyeq5-reset.yaml | 32 ++
.../bindings/soc/mobileye/mobileye,eyeq5-olb.yaml | 77 +++
MAINTAINERS | 8 +
.../{eyeq5-fixed-clocks.dtsi => eyeq5-clocks.dtsi} | 54 +-
arch/mips/boot/dts/mobileye/eyeq5-pins.dtsi | 128 +++++
arch/mips/boot/dts/mobileye/eyeq5.dtsi | 37 +-
drivers/clk/Kconfig | 11 +
drivers/clk/Makefile | 1 +
drivers/clk/clk-eyeq5.c | 414 ++++++++++++++
drivers/clk/clk-fixed-factor.c | 103 +++-
drivers/pinctrl/Kconfig | 15 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinctrl-eyeq5.c | 595 +++++++++++++++++++++
drivers/reset/Kconfig | 12 +
drivers/reset/Makefile | 1 +
drivers/reset/reset-eyeq5.c | 383 +++++++++++++
include/dt-bindings/clock/mobileye,eyeq5-clk.h | 22 +
include/linux/clk-provider.h | 26 +-
21 files changed, 1995 insertions(+), 61 deletions(-)
---
base-commit: 84f23245916391a55be31e37e48cea4da085b100
change-id: 20231023-mbly-clk-87ce5c241f08

Best regards,
--
Théo Lebrun <theo.lebrun@bootlin.com>