linux-kernel - [PATCH v4 3/3] spi: dw: Add support for master mode selection for DWC SSI controller

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Message-Id: <20220308103331.4116-4-nandhini.srikandan@intel.com>
Date:   Tue,  8 Mar 2022 18:33:31 +0800
From:   nandhini.srikandan@...el.com
To:     fancer.lancer@...il.com, broonie@...nel.org, robh+dt@...nel.org,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     devicetree@...r.kernel.org, mgross@...ux.intel.com,
        kris.pan@...el.com, kenchappa.demakkanavar@...el.com,
        furong.zhou@...el.com, mallikarjunappa.sangannavar@...el.com,
        mahesh.r.vaidya@...el.com, nandhini.srikandan@...el.com,
        rashmi.a@...el.com
Subject: [PATCH v4 3/3] spi: dw: Add support for master mode selection for DWC SSI controller

From: Nandhini Srikandan <nandhini.srikandan@...el.com>

Add support to select the controller mode as master mode by setting
Bit 31 of CTRLR0 register. This feature is supported for controller
versions above v1.02.

Signed-off-by: Nandhini Srikandan <nandhini.srikandan@...el.com>
---
 drivers/spi/spi-dw-core.c | 4 ++--
 drivers/spi/spi-dw.h      | 7 +++----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index ecea471ff42c..68bfdf2c4dc7 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -307,8 +307,8 @@ static u32 dw_spi_prepare_cr0(struct dw_spi *dws, struct spi_device *spi)
 		if (spi->mode & SPI_LOOP)
 			cr0 |= DW_HSSI_CTRLR0_SRL;
 
-		if (dws->caps & DW_SPI_CAP_KEEMBAY_MST)
-			cr0 |= DW_HSSI_CTRLR0_KEEMBAY_MST;
+		/* CTRLR0[31] MST */
+		cr0 |= DW_HSSI_CTRLR0_MST;
 	}
 
 	return cr0;
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index d5ee5130601e..2583b7314c41 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -23,7 +23,7 @@
 	((_dws)->ip == DW_ ## _ip ## _ID)
 
 #define __dw_spi_ver_cmp(_dws, _ip, _ver, _op) \
-	(dw_spi_ip_is(_dws, _ip) && (_dws)->ver _op DW_ ## _ip ## _ver)
+	(dw_spi_ip_is(_dws, _ip) && (_dws)->ver _op DW_ ## _ip ## _ ## _ver)
 
 #define dw_spi_ver_is(_dws, _ip, _ver) __dw_spi_ver_cmp(_dws, _ip, _ver, ==)
 
@@ -31,8 +31,7 @@
 
 /* DW SPI controller capabilities */
 #define DW_SPI_CAP_CS_OVERRIDE		BIT(0)
-#define DW_SPI_CAP_KEEMBAY_MST		BIT(1)
-#define DW_SPI_CAP_DFS32		BIT(2)
+#define DW_SPI_CAP_DFS32		BIT(1)
 
 /* Register offsets (Generic for both DWC APB SSI and DWC SSI IP-cores) */
 #define DW_SPI_CTRLR0			0x00
@@ -100,7 +99,7 @@
  * 0: SSI is slave
  * 1: SSI is master
  */
-#define DW_HSSI_CTRLR0_KEEMBAY_MST		BIT(31)
+#define DW_HSSI_CTRLR0_MST			BIT(31)
 
 /* Bit fields in CTRLR1 */
 #define DW_SPI_NDF_MASK				GENMASK(15, 0)
-- 
2.17.1