linux-kernel - Re: [PATCH v6 3/9] phy: phy-can-transceiver: Add dual channel support for TJA1048

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Message-ID: <20250919-placid-mauve-crayfish-4bac17-mkl@pengutronix.de>
Date: Fri, 19 Sep 2025 21:11:00 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Peng Fan <peng.fan@....com>
Cc: Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
	Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Aswath Govindraju <a-govindraju@...com>, 
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Frank Li <frank.li@....com>, 
	Haibo Chen <haibo.chen@....com>, linux-can@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 3/9] phy: phy-can-transceiver: Add dual channel
 support for TJA1048

On 09.09.2025 13:40:13, Peng Fan wrote:
> - Introduce new flag CAN_TRANSCEIVER_DUAL_CH to indicate the phy has two
>   channels.
> - Alloc a phy for each channel
> - Support TJA1048 which is a dual high-speed CAN transceiver with sleep
>   mode supported.
> - Add can_transceiver_phy_xlate for parsing phy
> 
> Reviewed-by: Frank Li <Frank.Li@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/phy/phy-can-transceiver.c | 91 ++++++++++++++++++++++++++++-----------
>  1 file changed, 65 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/phy/phy-can-transceiver.c b/drivers/phy/phy-can-transceiver.c
> index 6415c6af0e8414a6cc8d15958a17ee749a3f28e9..f06b1df76ada023f432dce892c3346f45397ab54 100644
> --- a/drivers/phy/phy-can-transceiver.c
> +++ b/drivers/phy/phy-can-transceiver.c
> @@ -17,6 +17,7 @@ struct can_transceiver_data {
>  	u32 flags;
>  #define CAN_TRANSCEIVER_STB_PRESENT	BIT(0)
>  #define CAN_TRANSCEIVER_EN_PRESENT	BIT(1)
> +#define CAN_TRANSCEIVER_DUAL_CH		BIT(2)
>  };
>  
>  struct can_transceiver_phy {
> @@ -29,6 +30,7 @@ struct can_transceiver_phy {
>  struct can_transceiver_priv {
>  	struct can_transceiver_phy *can_transceiver_phy;
>  	struct mux_state *mux_state;
> +	int num_ch;

As a flexible array this looks like:

struct can_transceiver_priv {
        struct can_transceiver_phy *can_transceiver_phy;
        int num_ch;
        struct mux_state mux_state[] __counted_by(num_ch);
}

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
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