linux-kernel - [PATCH 3/3] mtd: spi-nor: cadence-quadspi: Add support for Octal SPI controller

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Date:   Wed, 3 Oct 2018 22:26:03 +0530
From:   Vignesh R <vigneshr@...com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Brian Norris <computersforpeace@...il.com>,
        Yogesh Gaur <yogeshnarayan.gaur@....com>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Vignesh R <vigneshr@...com>
Subject: [PATCH 3/3] mtd: spi-nor: cadence-quadspi: Add support for Octal SPI controller

Cadence OSPI controller IP supports Octal IO (x8 IO lines),
It also has an integrated PHY. IP register layout is very
similar to existing QSPI IP except for additional bits to support Octal
and Octal DDR mode. Therefore, extend current driver to support Octal
mode.

Signed-off-by: Vignesh R <vigneshr@...com>
---
 drivers/mtd/spi-nor/cadence-quadspi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
index e24db817154e..48b00e75a879 100644
--- a/drivers/mtd/spi-nor/cadence-quadspi.c
+++ b/drivers/mtd/spi-nor/cadence-quadspi.c
@@ -101,6 +101,7 @@ struct cqspi_st {
 #define CQSPI_INST_TYPE_SINGLE			0
 #define CQSPI_INST_TYPE_DUAL			1
 #define CQSPI_INST_TYPE_QUAD			2
+#define CQSPI_INST_TYPE_OCTAL			3
 
 #define CQSPI_DUMMY_CLKS_PER_BYTE		8
 #define CQSPI_DUMMY_BYTES_MAX			4
@@ -898,6 +899,9 @@ static int cqspi_set_protocol(struct spi_nor *nor, const int read)
 		case SNOR_PROTO_1_1_4:
 			f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
 			break;
+		case SNOR_PROTO_1_1_8:
+			f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
+			break;
 		default:
 			return -EINVAL;
 		}
@@ -1205,6 +1209,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
 			SNOR_HWCAPS_READ_FAST |
 			SNOR_HWCAPS_READ_1_1_2 |
 			SNOR_HWCAPS_READ_1_1_4 |
+			SNOR_HWCAPS_READ_1_1_8 |
 			SNOR_HWCAPS_PP,
 	};
 	struct platform_device *pdev = cqspi->pdev;
@@ -1456,6 +1461,10 @@ static const struct of_device_id cqspi_dt_ids[] = {
 		.compatible = "ti,k2g-qspi",
 		.data = (void *)CQSPI_NEEDS_WR_DELAY,
 	},
+	{
+		.compatible = "ti,am654-ospi",
+		.data = (void *)CQSPI_NEEDS_WR_DELAY,
+	},
 	{ /* end of table */ }
 };
 
-- 
2.19.0