netdev - RE: [PATCH 14/17] can: flexcan: remove ack_grp and ack

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Date:   Wed, 14 Oct 2020 08:53:20 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: RE: [PATCH 14/17] can: flexcan: remove ack_grp and ack_bit handling
 from driver


> -----Original Message-----
> From: Marc Kleine-Budde <mkl@...gutronix.de>
> Sent: 2020年10月8日 5:32
> To: netdev@...r.kernel.org
> Cc: davem@...emloft.net; linux-can@...r.kernel.org;
> kernel@...gutronix.de; Marc Kleine-Budde <mkl@...gutronix.de>; Joakim
> Zhang <qiangqing.zhang@....com>
> Subject: [PATCH 14/17] can: flexcan: remove ack_grp and ack_bit handling from
> driver
> 
> Since commit:
> 
>     048e3a34a2e7 can: flexcan: poll MCR_LPM_ACK instead of GPR ACK for
> stop mode acknowledgment
> 
> the driver polls the IP core's internal bit MCR[LPM_ACK] as stop mode
> acknowledge and not the acknowledgment on chip level.
> 
> This means the 4th and 5th value of the property "fsl,stop-mode" isn't used
> anymore. This patch removes the used "ack_gpr" and "ack_bit" from the
> driver.
> 
> Link:
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flore.kern
> el.org%2Fr%2F20201006203748.1750156-15-mkl%40pengutronix.de&amp;dat
> a=02%7C01%7Cqiangqing.zhang%40nxp.com%7C1540ad5bf7bd4a1e10a508d8
> 6b087a67%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637377031
> 436785787&amp;sdata=ierIIVdSqZFLklIvgMokHX6LU77cEWQgUGzUi6CHdDI%
> 3D&amp;reserved=0
> Fixes: 048e3a34a2e7 ("can: flexcan: poll MCR_LPM_ACK instead of GPR ACK
> for stop mode acknowledgment")
> Cc: Joakim Zhang <qiangqing.zhang@....com>
> Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>

[...]
>  	/* stop mode property format is:
> -	 * <&gpr req_gpr req_bit ack_gpr ack_bit>.
> +	 * <&gpr req_gpr>.

Hi Marc,

Sorry for response delay, stop mode property format should be "<&gpr req_gpr req_bit>", I saw this code change has went into linux-next, so I will correct it by the way next time when I upsteam wakeup function for i.MX8.

Need I update stop mode property in dts file? Although this function won't be broken without dts update.

Best Regards,
Joakim Zhang