linux-kernel - Re: [PATCH v6 0/4] rockchip: add can for RK3576 Soc

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Message-ID: <20250527-steady-dormouse-of-culture-c45bd6-mkl@pengutronix.de>
Date: Tue, 27 May 2025 17:58:15 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Elaine Zhang <zhangqing@...k-chips.com>
Cc: kernel@...gutronix.de, mailhol.vincent@...adoo.fr, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, heiko@...ech.de, cl@...k-chips.com, 
	kever.yang@...k-chips.com, linux-can@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v6 0/4] rockchip: add can for RK3576 Soc

On 26.05.2025 14:25:55, Elaine Zhang wrote:
> rk3576 can is a new controller,new register layout and Bit position
> definition:
> Support CAN and CANFD protocol.
> Support Dma.
> 
> There are major differences from the previous rk3568.
> All errata on the rk3568 have been fixed and redesigned.

Can you configure the IP core for CAN-2.0 a.k.a. CAN-CC only mode, so
that it only receives CAN-CC frames only and not CAN-FD?

What happens if you configure register RKCAN_STR_CTL, ism_sel to 2'b01:
CAN Fixed and receive a CAN-FD frame?

Is there a more detailed description to "2'b00: Flexible; cover_mode
must disable" and "2'b11: Mixed. cover_mode must disable"?

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
Embedded Linux                   | https://www.pengutronix.de |
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