[U-Boot] [PATCH] env: ti: boot: Use ttyS2 instead of ttyO2

[Tom Rini]

On Fri, Jul 12, 2019 at 08:38:12PM +0300, Sam Protsenko wrote:

> ttyO2 console enables legacy CONFIG_SERIAL_OMAP driver in kernel.
> Nowadays it's preferred to use the generic CONFIG_SERIAL_8250_OMAP
> driver, which being enabled via ttyS2 console. Both drivers are enabled
> in multi_v7_defconfig and in omap2plus_defconfig, for compatibility
> reasons. Let's switch to ttyS2 console, to be sure that standard 8250
> serial driver is used.
> 
> Similar behavior can be also achieved by enabling
> CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP option in kernel, but it's better not
> to rely on that, as it can be disabled or removed after transitional
> period.
> 
> Right now on DRA7/AM57x platforms the 8250-omap driver is being probed
> first, and omap-serial driver is only probed if the first one failed.
> It can be seen from uart3 definition in arch/arm/boot/dts/dra7-l4.dtsi:
> 
>     compatible = "ti,dra742-uart", "ti,omap4-uart";
> 
> So the kernel already uses 8250 driver. This change basically allows
> kernel developers to throw away the omap-serial driver and associated
> compatibility options. Similar discussions [1,2] have started several
> years ago, so it should be safe to do that now.
> 
> [1] https://patchwork.kernel.org/patch/6198471/
> [2] http://processors.wiki.ti.com/index.php/Sitara_Linux_UART_-_Switching_to_8250_Driver
> 
> Signed-off-by: Sam Protsenko <semen.protsenko at linaro.org>
> Reviewed-by: Andrew F. Davis <afd at ti.com>

Applied to u-boot/master, thanks!

-- 
Tom
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