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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: Sekhar Nori <nsekhar@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
34 lines
1.5 KiB
Plaintext
34 lines
1.5 KiB
Plaintext
OMAP UART controller
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Required properties:
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- compatible : should be "ti,omap2-uart" for OMAP2 controllers
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- compatible : should be "ti,omap3-uart" for OMAP3 controllers
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- compatible : should be "ti,omap4-uart" for OMAP4 controllers
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- compatible : should be "ti,am4372-uart" for AM437x controllers
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- compatible : should be "ti,am3352-uart" for AM335x controllers
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- compatible : should be "ti,dra742-uart" for DRA7x controllers
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- reg : address and length of the register space
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- interrupts or interrupts-extended : Should contain the uart interrupt
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specifier or both the interrupt
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controller phandle and interrupt
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specifier.
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- ti,hwmods : Must be "uart<n>", n being the instance number (1-based)
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Optional properties:
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- clock-frequency : frequency of the clock input to the UART
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- dmas : DMA specifier, consisting of a phandle to the DMA controller
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node and a DMA channel number.
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- dma-names : "rx" for receive channel, "tx" for transmit channel.
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Example:
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uart4: serial@49042000 {
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compatible = "ti,omap3-uart";
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reg = <0x49042000 0x400>;
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interrupts = <80>;
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dmas = <&sdma 81 &sdma 82>;
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dma-names = "tx", "rx";
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ti,hwmods = "uart4";
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clock-frequency = <48000000>;
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};
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