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Commit eb43e023 authored by Marcin Wojtas's avatar Marcin Wojtas Committed by David S. Miller
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misc: sram: add optional ioremap without write combining 



Some SRAM users may require non-bufferable access to the memory, which is
impossible, because devm_ioremap_wc() is used for setting sram->virt_base.

This commit adds optional flag 'no-memory-wc', which allow to choose remap
method, using DT property. Documentation is updated accordingly.

Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d3bf9b19

Documentation/devicetree/bindings/sram/sram.txt

+5 −0
Original line number Diff line number Diff line
@@ -25,6 +25,11 @@ Required properties in the sram node: 
- ranges : standard definition, should translate from local addresses

           within the sram to bus addresses



Optional properties in the sram node:



- no-memory-wc : the flag indicating, that SRAM memory region has not to

                 be remapped as write combining. WC is used by default.



Required properties in the area nodes:



- reg : iomem address range, relative to the SRAM range

drivers/misc/sram.c

+4 −1
Original line number Diff line number Diff line
@@ -360,6 +360,9 @@ static int sram_probe(struct platform_device *pdev) 
		return -EBUSY;

	}



	if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))

		sram->virt_base = devm_ioremap(sram->dev, res->start, size);

	else

		sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);

	if (IS_ERR(sram->virt_base))

		return PTR_ERR(sram->virt_base);