board: orangepi-5b: fix BT host-wake IRQ direction

[defcom5-rockchip]

Description

Fixes #10370.

GPIO0_C5 boots as an output, so gpiochip_lock_as_irq() returns -EIO and the
BT host-wake IRQ never registers - two error lines every boot, and wake-on-BT
does not work. pcfg_pull_down sets bias only, not direction;
PIN_CONFIG_INPUT_ENABLE forces the GPIO mux and calls direction_input().

rockchip-pinconf.dtsi has no pcfg node carrying input-enable (only
pcfg_output_high / pcfg_output_low), so one is declared locally.

Follow-up to #10289, which was untested on the 5B.

How Has This Been Tested?

• Tested on Orange Pi 5B hardware

Before: gpioinfo shows line 21 as output, unclaimed; no host_wake entry in
/proc/interrupts.

After: line 21 reads input, and the IRQ registers and delivers:

99:  20  0  0  0  0  0  0  0  rockchip_gpio_irq  21 Edge  host_wake

WiFi and Bluetooth are otherwise unchanged. Verified on a mainline 7.1.3 kernel
using this DT wiring rather than via an Armbian build.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

Summary by CodeRabbit

• Bug Fixes
  • Improved Bluetooth host-wakeup pin handling on supported Orange Pi 5B devices.
  • Prevented unintended pull-down bias while keeping the wake-up input enabled.

[coderabbitai]

📝 Walkthrough

Walkthrough

The device trees add pcfg_input_enable with disabled bias and enabled input mode. The Bluetooth host-wakeup pin uses this configuration across the Rockchip 6.18, 7.1, and 7.2 device trees.

Changes

Bluetooth host-wakeup configuration

Layer / File(s)	Summary
Input-enabled host-wakeup pin patch/kernel/archive/rockchip64-6.18/dt/rk3588s-orangepi-5b.dts, patch/kernel/archive/rockchip64-7.1/dt/rk3588s-orangepi-5b.dts, patch/kernel/archive/rockchip64-7.2/dt/rk3588s-orangepi-5b.dts	Adds the reusable pcfg_input_enable configuration and applies it to the Bluetooth host-wakeup pin instead of pull-down bias.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• armbian/build#10289: Adds the Orange Pi 5B Bluetooth host-wakeup pin configuration updated by this PR.
• armbian/build#10374: Implements the same Orange Pi 5B Bluetooth host-wake pinctrl fix.

Suggested reviewers: igorpecovnik, iav, superkali, ahoneybun, amazingfate

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes add input-enable configuration for GPIO0_C5 across 7.1, 6.18, and 7.2, satisfying issue #10370.
Out of Scope Changes check	✅ Passed	All changes address the linked IRQ issue, and applying the fix to 6.18 and 7.2 is explicitly requested.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: fixing the Orange Pi 5B Bluetooth host-wake IRQ GPIO direction.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

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[EvilOlaf]

changes must go into 6.18 and 7.2 patchsets as well if applicable, otherwise on transition they will be lost

[defcom5-rockchip]

Done — added to rockchip64-6.18 and rockchip64-7.2. All three dts files were byte-identical, so it's the same two hunks; the resulting blobs hash the same across all three.

rockchip64-6.12 has no bt_wake_host_irq node, so it isn't affected.

Hardware-tested on 7.1 only — flagged in the commit message.

[github-actions]

✅ This PR has been reviewed and approved — all set for merge!