linux-kernel - [RFC PATCH 2/2] spi: zynqmp: gqspi: add support for stacked mode configuration

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Message-ID: <1436445895-25504-3-git-send-email-ranjit.waghmode@xilinx.com>
Date:	Thu, 9 Jul 2015 18:14:55 +0530
From:	Ranjit Waghmode <ranjit.waghmode@...inx.com>
To:	<broonie@...nel.org>, <michal.simek@...inx.com>,
	<soren.brinkmann@...inx.com>, <dwmw2@...radead.org>,
	<computersforpeace@...il.com>, <zajec5@...il.com>, <marex@...x.de>,
	<shijie.huang@...el.com>, <juhosg@...nwrt.org>,
	<ben@...adent.org.uk>
CC:	<linux-mtd@...ts.infradead.org>, <linux-spi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <harinik@...inx.com>,
	<punnaia@...inx.com>, <ran27jit@...il.com>,
	Ranjit Waghmode <ranjit.waghmode@...inx.com>
Subject: [RFC PATCH 2/2] spi: zynqmp: gqspi: add support for stacked mode configuration

This patch adds support of stacked mode configuration for
Zynq Ultrascale+ MPSoC GQSPI controller driver.

Signed-off-by: Ranjit Waghmode <ranjit.waghmode@...inx.com>
---
 drivers/spi/spi-zynqmp-gqspi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c
index 271fa80..6c9f7d9 100644
--- a/drivers/spi/spi-zynqmp-gqspi.c
+++ b/drivers/spi/spi-zynqmp-gqspi.c
@@ -410,6 +410,10 @@ static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
 		zynqmp_gqspi_selectslave(xqspi,
 				GQSPI_SELECT_FLASH_CS_BOTH,
 				GQSPI_SELECT_FLASH_BUS_BOTH);
+	} else if (qspi->master->flags & SPI_MASTER_U_PAGE) {
+		zynqmp_gqspi_selectflash(xqspi,
+				GQSPI_SELECT_FLASH_CS_UPPER,
+				GQSPI_SELECT_FLASH_BUS_LOWER);
 	} else {
 		zynqmp_gqspi_selectslave(xqspi,
 				GQSPI_SELECT_FLASH_CS_LOWER,
--
2.1.2

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