linux-kernel - [RFC PATCH 3/5] mtd: devices: m25p80: set flag to request memory mapped read

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Message-ID: <1438072876-16338-4-git-send-email-vigneshr@ti.com>
Date:	Tue, 28 Jul 2015 14:11:14 +0530
From:	Vignesh R <vigneshr@...com>
To:	Mark Brown <broonie@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>
CC:	Huang Shijie <b32955@...escale.com>, Vignesh R <vigneshr@...com>,
	<linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<linux-spi@...r.kernel.org>
Subject: [RFC PATCH 3/5] mtd: devices: m25p80: set flag to request memory mapped read

Set use_mmap_read flag to true, to indicate to spi-master that the
spi-message is from mtd layer. This helps spi-master to do memory
mapped reads over SPI flash memories, when hardware support is
available.

Signed-off-by: Vignesh R <vigneshr@...com>
---
 drivers/mtd/devices/m25p80.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index d313f948b96c..aac2121c5454 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -148,6 +148,9 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 	t[1].len = len;
 	spi_message_add_tail(&t[1], &m);
 
+	m.spi = spi;
+	m.use_mmap_mode = true;
+
 	spi_sync(spi, &m);
 
 	*retlen = m.actual_length - m25p_cmdsz(nor) - dummy;
-- 
2.4.6

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