linux-kernel - Re: [PATCH v7 2/3] greybus: Add BeaglePlay Linux Driver

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Date:   Thu, 5 Oct 2023 11:08:32 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ayush Singh <ayushdevel1325@...il.com>
Cc:     greybus-dev@...ts.linaro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, vaishnav@...gleboard.org,
        jkridner@...gleboard.org, nm@...com,
        krzysztof.kozlowski+dt@...aro.org, johan@...nel.org,
        elder@...nel.org
Subject: Re: [PATCH v7 2/3] greybus: Add BeaglePlay Linux Driver

On Thu, Oct 05, 2023 at 12:16:37AM +0530, Ayush Singh wrote:
> Add the Greybus host driver for BeaglePlay board by BeagleBoard.org.
> 
> The current greybus setup involves running SVC in a user-space
> application (GBridge) and using netlink to communicate with kernel
> space. GBridge itself uses wpanusb kernel driver, so the greybus messages
> travel from kernel space (gb_netlink) to user-space (GBridge) and then
> back to kernel space (wpanusb) before reaching CC1352.
> 
> This driver directly communicates with CC1352 (running SVC Zephyr
> application). Thus, it simplifies the complete greybus setup eliminating
> user-space GBridge.
> 
> This driver is responsible for the following:
> - Start SVC (CC1352) on driver load.
> - Send/Receive Greybus messages to/from CC1352 using HDLC over UART.
> - Print Logs from CC1352.
> - Stop SVC (CC1352) on driver load.
> 
> Signed-off-by: Ayush Singh <ayushdevel1325@...il.com>
> ---
>  MAINTAINERS                     |   1 +
>  drivers/greybus/Kconfig         |  10 +
>  drivers/greybus/Makefile        |   2 +
>  drivers/greybus/gb-beagleplay.c | 501 ++++++++++++++++++++++++++++++++
>  4 files changed, 514 insertions(+)
>  create mode 100644 drivers/greybus/gb-beagleplay.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5467669d7963..d87e30626a6a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8974,6 +8974,7 @@ M:	Ayush Singh <ayushdevel1325@...il.com>
>  L:	greybus-dev@...ts.linaro.org (moderated for non-subscribers)
>  S:	Maintained
>  F:	Documentation/devicetree/bindings/net/ti,cc1352p7.yaml
> +F:	drivers/greybus/gb-beagleplay.c
>  
>  GREYBUS SUBSYSTEM
>  M:	Johan Hovold <johan@...nel.org>
> diff --git a/drivers/greybus/Kconfig b/drivers/greybus/Kconfig
> index 78ba3c3083d5..fd4f26d09c53 100644
> --- a/drivers/greybus/Kconfig
> +++ b/drivers/greybus/Kconfig
> @@ -17,6 +17,16 @@ menuconfig GREYBUS
>  
>  if GREYBUS
>  
> +config GREYBUS_BEAGLEPLAY
> +	tristate "Greybus BeaglePlay driver"
> +	depends on TTY

What you want to depend on here is serdev, not tty, right?  Or am I
mis-reading the code requirements?

thanks,

greg k-h