> Subject: [PATCH 1/1] Revert "tty: serial: fsl_lpuart: drop earlycon entry for
> i.MX8QXP"
>
> Revert commit b4b844930f27 ("tty: serial: fsl_lpuart: drop earlycon entry for
> i.MX8QXP"), because this breaks earlycon support on imx8qm/imx8qxp.
> While it is true that for earlycon there is no difference between i.MX8QXP and
> i.MX7ULP (for now at least), there are differences regarding clocks and fixups
> for wakeup support. For that reason it was deemed unacceptable to add the
> imx7ulp compatible to device tree in order to get earlycon working again.
>
> Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Reviewed-by: Peng Fan <peng.fan@xxxxxxx>
> ---
> Following the discussion from [1] and [2] lpuart should not be considered
> compatible on i.MX/ULP and i.MX8XQP/i.MX8QM.
>
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.infr
> adead.org%2Fpipermail%2Flinux-arm-kernel%2F2021-November%2F698082.
> html&data=04%7C01%7Cpeng.fan%40nxp.com%7Ce5fc0a232dd34b172
> 4fd08d9af1c68c1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6
> 37733358817043520%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM
> DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdat
> a=UVjwiXnV3as43VtiHY5Wppy4PiHqX%2FS3BIVqXedxYYE%3D&reserved
> =0
> [2]
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.infr
> adead.org%2Fpipermail%2Flinux-arm-kernel%2F2021-November%2F698318.
> html&data=04%7C01%7Cpeng.fan%40nxp.com%7Ce5fc0a232dd34b172
> 4fd08d9af1c68c1%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C6
> 37733358817043520%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM
> DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdat
> a=TERDm6qvf%2F47VwHaJvrnw2z6M%2F7dZ3%2BdesoU0PH8wNs%3D&am
> p;reserved=0
>
> drivers/tty/serial/fsl_lpuart.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index
> b1e7190ae483..ac5112def40d 100644
> --- a/drivers/tty/serial/fsl_lpuart.c
> +++ b/drivers/tty/serial/fsl_lpuart.c
> @@ -2625,6 +2625,7 @@ OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart",
> lpuart_early_console_setup); OF_EARLYCON_DECLARE(lpuart32,
> "fsl,ls1021a-lpuart", lpuart32_early_console_setup);
> OF_EARLYCON_DECLARE(lpuart32, "fsl,ls1028a-lpuart",
> ls1028a_early_console_setup); OF_EARLYCON_DECLARE(lpuart32,
> "fsl,imx7ulp-lpuart", lpuart32_imx_early_console_setup);
> +OF_EARLYCON_DECLARE(lpuart32, "fsl,imx8qxp-lpuart",
> +lpuart32_imx_early_console_setup);
> EARLYCON_DECLARE(lpuart, lpuart_early_console_setup);
> EARLYCON_DECLARE(lpuart32, lpuart32_early_console_setup);
>
> --
> 2.25.1
