[PATCH v2] wireless-regdb: Update 6 GHz rules for Hong Kong (HK)

[Louis Kotze <loukot@gmail.com>]

HKCA 1081 Issue 2 (August 2025) updated the 6 GHz WLAN specification
for Hong Kong. The specification defines two device categories per
ETSI EN 303 687:

  LPI (Low Power Indoor): 24 dBm EIRP, indoor only
  VLP (Very Low Power):   14 dBm EIRP, no restriction

The current entry uses VLP power (14 dBm) with no indoor flag.
Update to LPI with the NO-OUTDOOR flag.

LPI is the appropriate choice because indoor WiFi is the primary
use case for 6 GHz. The VLP limit of 14 dBm is too low for
practical network operation with standard access points advertising
LPI power levels, causing repeated regulatory mismatch errors.

The LPI EIRP of 24 dBm includes a 1 dB uplift granted by HKCA 1081
footnote 1 over the EN 303 687 base of 23 dBm (clauses 4.3.2 and
4.3.3), with PSD increased from 10 to 11 dBm/MHz accordingly.

Correct the frequency start from 5925 to 5945 MHz. HKCA 1081
clause 2.1 reserves 5925-5945 MHz as a guard band.

Reference:
HKCA 1081 Issue 2 (August 2025)
https://www.ofca.gov.hk/filemanager/ofca/en/content_401/hkca1081.pdf

Signed-off-by: Louis Kotze <loukot@gmail.com>
---
Changes since v1:
  - Add explicit LPI vs VLP justification in commit message per
    Chen-Yu Tsai review.
  - Drop incorrect claim that 5925 MHz start was "wrong" — clarify
    that the guard band reservation is per HKCA 1081 clause 2.1.
  - Add empty line before Signed-off-by.
  - Bandwidth stays at 160 MHz per EN 303 687 V1.1.1 (verified:
    maximum channel group is 160 MHz, 320 MHz not in this version).
  - Send as standalone patch rather than part of 5-patch series,
    since remaining patches need separate handling.

v1: https://lore.kernel.org/wireless-regdb/20260411222155.299441-2-loukot@gmail.com/

 db.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/db.txt b/db.txt
index 343b256..778ac21 100644
--- a/db.txt
+++ b/db.txt
@@ -883,7 +883,7 @@ country HK: DFS-ETSI
 	(5250 - 5330 @ 80), (20), DFS, AUTO-BW, NO-OUTDOOR
 	(5470 - 5730 @ 160), (27), DFS
 	(5730 - 5850 @ 80), (36)
-	(5925 - 6425 @ 160), (14)
+	(5945 - 6425 @ 160), (24), NO-OUTDOOR

 # Source:
 # https://www.conatel.gob.hn/doc/Regulacion/resoluciones/2023/NR05-23.pdf
--
2.53.0