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Commit 27c93af7 authored by Sekhar Nori's avatar Sekhar Nori Committed by Greg Kroah-Hartman
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serial: 8250_omap: workaround module disable errata on dra7x SoCs 



Due to Advisory 21 as documented in AM437x errata document,
UART module cannot be disabled once DMA is used. The only
workaround is to softreset the module before disabling it.

DRA7x UARTs are compatible to AM437x UARTs in terms of
this errata and prescribed workaround.

Enable usage of workaround for this errata on DRA7x SoCs.

Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Reviewed-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cdb929e4

Documentation/devicetree/bindings/serial/omap_serial.txt

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ Required properties: 
- compatible : should be "ti,omap4-uart" for OMAP4 controllers

- compatible : should be "ti,am4372-uart" for AM437x controllers

- compatible : should be "ti,am3352-uart" for AM335x controllers

- compatible : should be "ti,dra742-uart" for DRA7x controllers

- reg : address and length of the register space

- interrupts or interrupts-extended : Should contain the uart interrupt

                                      specifier or both the interrupt

drivers/tty/serial/8250/8250_omap.c

+1 −0
Original line number Diff line number Diff line
@@ -1082,6 +1082,7 @@ static const struct of_device_id omap8250_dt_ids[] = { 
	{ .compatible = "ti,omap4-uart" },

	{ .compatible = "ti,am3352-uart", .data = &am3352_habit, },

	{ .compatible = "ti,am4372-uart", .data = &am4372_habit, },

	{ .compatible = "ti,dra742-uart", .data = &am4372_habit, },

	{},

};

MODULE_DEVICE_TABLE(of, omap8250_dt_ids);