netdev - Re: [PATCH v3 2/2] NFC: trf7970a: Create device-tree parameter for RX gain reduction

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Message-ID: <20250627-truthful-versed-civet-375ea4@krzk-bin>
Date: Fri, 27 Jun 2025 09:39:46 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Paul Geurts <paul.geurts@...drive-technologies.com>
Cc: mgreer@...malcreek.com, andrew+netdev@...n.ch, davem@...emloft.net, 
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, robh@...nel.org, 
	conor+dt@...nel.org, linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	martijn.de.gouw@...drive-technologies.com
Subject: Re: [PATCH v3 2/2] NFC: trf7970a: Create device-tree parameter for
 RX gain reduction

On Thu, Jun 26, 2025 at 04:12:42PM +0200, Paul Geurts wrote:
> The TRF7970a device is sensitive to RF disturbances, which can make it
> hard to pass some EMC immunity tests. By reducing the RX antenna gain,
> the device becomes less sensitive to EMC disturbances, as a trade-off
> against antenna performance.
> 
> Add a device tree option to select RX gain reduction to improve EMC
> performance.
> 
> Selecting a communication standard in the ISO control register resets
> the RX antenna gain settings. Therefore set the RX gain reduction
> everytime the ISO control register changes, when the option is used.
> 
> Signed-off-by: Paul Geurts <paul.geurts@...drive-technologies.com>
> ---
>  drivers/nfc/trf7970a.c | 91 +++++++++++++++++++++++++++++++++++++-----
>  1 file changed, 80 insertions(+), 11 deletions(-)

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof