[PATCH v2 0/3] nfc: st-nci: Fairphone 5 NFC bring-up (ST21NFCD)

This adds NFC on the Fairphone 5 (qcm6490). The board uses an ST21NFCD
on I2C. That part speaks raw NCI; the current st-nci driver always
wraps NDLC, so using st,st21nfcb-i2c leaves the adapter unusable.

The series adds a st,st21nfcd compatible for the raw-NCI path and
the Fairphone 5 DT node. Boards that already use st21nfcb / st21nfcc
keep the NDLC path.

Tested on a Fairphone 5 running postmarketOS, with these changes as
modules on a 7.1.2 sc7280 kernel:

- nfctool: Powered: Yes
- initiator poll / neard: NTAG 215, NDEF URI read OK

ese-present and uicc-present follow the public schematic (NFC_SWP1/SWP2:
SWP_SE to SIM1, SWP_UICC to SIM2). SE/HCE is not tested.

CLK_REQ (GPIO 39) is omitted, as on Fairphone 6 NFC. VBAT and VDD_TX sit
on VPH_PWR and are not modelled. VCC_UICC_IN (L4C) is not modelled;
UICC SWP is untested.

Changes in v2:
- Compatible is st,st21nfcd (no -i2c suffix)
- Sent without PGP/MIME
- DTS: interrupts-extended and pinctrl for IRQ/reset
- DTS: ese-present / uicc-present (schematic)
- DTS: SYS_CLK from LN_BB_CLK2, VPS_IO from L18B
- Binding: optional clocks and vdd-io-supply
- Driver: optional clk / vdd-io enable

Kristian Brox (3):
  dt-bindings: net: nfc: add st,st21nfcd
  nfc: st-nci: add raw NCI path for ST21NFCD
  arm64: dts: qcom: qcm6490-fairphone-fp5: add ST21NFCD NFC

Signed-off-by: Kristian Brox <[email protected]>
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