linux-kernel - [LINUX PATCH 1/2] mtd: Added dummy entry in the spi

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Date:	Mon, 21 Mar 2016 17:50:08 +0530
From:	P L Sai Krishna <lakshmi.sai.krishna.potthuri@...inx.com>
To:	Michal Simek <michal.simek@...inx.com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"Brian Norris" <computersforpeace@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"Javier Martinez Canillas" <javier@....samsung.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Stephen Warren <swarren@...dia.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	"Andrew F. Davis" <afd@...com>, Marek Vasut <marex@...x.de>,
	Jagan Teki <jteki@...nedev.com>,
	Rafał Miłecki <zajec5@...il.com>
CC:	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-spi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	"Harini Katakam" <harinik@...inx.com>,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>,
	Anirudha Sarangi <anirudh@...inx.com>,
	P L Sai Krishna <lakshmis@...inx.com>
Subject: [LINUX PATCH 1/2] mtd: Added dummy entry in the spi_transfer structure.

This patch does following things.
1. Added dummy entry in the spi_transfer structure.
2. Assigned dummy cycles to dummy member in the transfer
structure during read operation.

Signed-off-by: P L Sai Krishna <lakshmis@...inx.com>
---
 drivers/mtd/devices/m25p80.c | 1 +
 include/linux/spi/spi.h      | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index c9c3b7f..7c9fac9 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -139,6 +139,7 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 
 	t[0].tx_buf = flash->command;
 	t[0].len = m25p_cmdsz(nor) + dummy;
+	t[0].dummy = nor->read_dummy;
 	spi_message_add_tail(&t[0], &m);
 
 	t[1].rx_buf = buf;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 857a9a1..3f93526 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -664,6 +664,7 @@ extern void spi_res_release(struct spi_master *master,
  * @len: size of rx and tx buffers (in bytes)
  * @speed_hz: Select a speed other than the device default for this
  *      transfer. If 0 the default (from @spi_device) is used.
+ * @dummy: number of dummy cycles.
  * @bits_per_word: select a bits_per_word other than the device default
  *      for this transfer. If 0 the default (from @spi_device) is used.
  * @cs_change: affects chipselect after this transfer completes
@@ -752,6 +753,7 @@ struct spi_transfer {
 	u8		bits_per_word;
 	u16		delay_usecs;
 	u32		speed_hz;
+	u32		dummy;
 
 	struct list_head transfer_list;
 };
-- 
2.1.2