linux-kernel - [PATCH 1/6] spi: altera: add 32bit data width transfer support.

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Message-Id: <1591845911-10197-2-git-send-email-yilun.xu@intel.com>
Date:   Thu, 11 Jun 2020 11:25:06 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     broonie@...nel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     trix@...hat.com, yilun.xu@...el.com, hao.wu@...el.com,
        matthew.gerlach@...ux.intel.com, russell.h.weight@...el.com
Subject: [PATCH 1/6] spi: altera: add 32bit data width transfer support.

Add support for 32bit width data register, then it supports 32bit
data width spi slave device and spi transfers.

Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@...ux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@...el.com>
---
 drivers/spi/spi-altera.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c
index 41d71ba..d5fa0c5 100644
--- a/drivers/spi/spi-altera.c
+++ b/drivers/spi/spi-altera.c
@@ -86,6 +86,13 @@ static void altera_spi_tx_word(struct altera_spi *hw)
 			txd = (hw->tx[hw->count * 2]
 				| (hw->tx[hw->count * 2 + 1] << 8));
 			break;
+		case 4:
+			txd = (hw->tx[hw->count * 4]
+				| (hw->tx[hw->count * 4 + 1] << 8)
+				| (hw->tx[hw->count * 4 + 2] << 16)
+				| (hw->tx[hw->count * 4 + 3] << 24));
+			break;
+
 		}
 	}
 
@@ -106,6 +113,13 @@ static void altera_spi_rx_word(struct altera_spi *hw)
 			hw->rx[hw->count * 2] = rxd;
 			hw->rx[hw->count * 2 + 1] = rxd >> 8;
 			break;
+		case 4:
+			hw->rx[hw->count * 4] = rxd;
+			hw->rx[hw->count * 4 + 1] = rxd >> 8;
+			hw->rx[hw->count * 4 + 2] = rxd >> 16;
+			hw->rx[hw->count * 4 + 3] = rxd >> 24;
+			break;
+
 		}
 	}
 
-- 
2.7.4