linux-kernel - Re: [PATCH 1/3] staging: r8188eu: remove 5 GHz channels from ch_freq

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Date:   Mon, 21 Feb 2022 13:41:22 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>
Cc:     phil@...lpotter.co.uk, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] staging: r8188eu: remove 5 GHz channels from
 ch_freq_map

On 2/21/22 11:13, Greg KH wrote:
> On Sun, Feb 20, 2022 at 04:48:45PM +0100, Michael Straube wrote:
>> This driver is for chips that operate only in the 2.4 GHz band.
> 
> How do we know that?
> 
> thanks,
Realtek 
(https://www.realtek.com/en/products/communications-network-ics/item/rtl8188eus) 
states the following:

"The Realtek RTL8188EUS is an 802.11bgn 2.4G single-chip that integrates 
Wireless LAN (WLAN) and a network USB interface (USB 1.0/1.1/2.0 compatible) 
controller. It combines a WLAN MAC, a 1T1R capable WLAN baseband, and WLAN RF in 
a single chip. The RTL8188EUS provides a complete solution for high-throughput 
performance and low power consumption integrated wireless LAN devices."

The reason there are 5G snippets in the driver is because Realtek uses the base 
code to generate drivers for other chip families such as RTL8192DU that have 
radios for both 2.4 and 5G bands. The RTL81288EU and variants have only a single 
radio.

Larry