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.protse...@linaro.org> > Reviewed-by: Andrew F. Davis <a...@ti.com>
Applied to u-boot/master, thanks! -- Tom
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