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Message-Id: <1457944745-7634-2-git-send-email-gregory.clement@free-electrons.com> Date: Mon, 14 Mar 2016 09:38:56 +0100 From: Gregory CLEMENT <gregory.clement@...e-electrons.com> To: "David S. Miller" <davem@...emloft.net>, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, Florian Fainelli <f.fainelli@...il.com> Cc: Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>, Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>, Gregory CLEMENT <gregory.clement@...e-electrons.com>, linux-arm-kernel@...ts.infradead.org, Lior Amsalem <alior@...vell.com>, Nadav Haklai <nadavh@...vell.com>, Marcin Wojtas <mw@...ihalf.com>, Simon Guinot <simon.guinot@...uanux.org>, Russell King - ARM Linux <linux@....linux.org.uk>, Willy Tarreau <w@....eu>, Timor Kardashov <timork@...vell.com>, Dmitri Epshtein <dima@...vell.com>, Sebastian Careba <nitroshift@...oo.com> Subject: [PATCH v6 net-next 01/10] misc: sram: add optional ioremap without write combining From: Marcin Wojtas <mw@...ihalf.com> 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: Marcin Wojtas <mw@...ihalf.com> --- Documentation/devicetree/bindings/sram/sram.txt | 5 +++++ drivers/misc/sram.c | 5 ++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/sram/sram.txt b/Documentation/devicetree/bindings/sram/sram.txt index 42ee9438b771..227e3a341af1 100644 --- a/Documentation/devicetree/bindings/sram/sram.txt +++ b/Documentation/devicetree/bindings/sram/sram.txt @@ -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 diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c index 736dae715dbf..69cdabea9c03 100644 --- a/drivers/misc/sram.c +++ b/drivers/misc/sram.c @@ -360,7 +360,10 @@ static int sram_probe(struct platform_device *pdev) return -EBUSY; } - sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size); + 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); -- 2.5.0
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