Re: [PATCH v5 6/6] arm64: dts: qcom: milos-fairphone-fp6: Add NFC

On 8/12/26 12:01 AM, Jorijn van der Graaf wrote:

Add the Samsung S3NRN4V NCI NFC controller on i2c1. Its XI clock comes
from the PMK7635 CLK7_LN buffer (RPMH_LN_BB_CLK2), and the reference is
load-bearing: with no clocks reference at all the chip polls but never
activates a tag, while a held rpmh clock vote lets it read (verified on
hardware).

hw generally works better when plugged in!

PVDD is fed from PM7550 LDO20, the rail the downstream driver switches
for this chip.

The enable line is routed to the chip's power-down input. The driver
drives its "en" descriptor to logical 1 to hold the chip powered down,
and on this board the chip is off while the pin is physically high, so
the line is GPIO_ACTIVE_HIGH. The pin is pulled up so the chip stays
off while the line is not driven.

Assisted-by: Claude:claude-opus-4-8
Assisted-by: Claude:claude-fable-5
Signed-off-by: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
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Reviewed-by: Konrad Dybcio <redacted>

Konrad