linux-kernel - [PATCH v2 1/4] spi: rzv2m-csi: Squash timing settings into one statement

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Message-Id: <20230718192453.543549-2-fabrizio.castro.jz@renesas.com>
Date:   Tue, 18 Jul 2023 20:24:50 +0100
From:   Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To:     Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        linux-renesas-soc@...r.kernel.org
Subject: [PATCH v2 1/4] spi: rzv2m-csi: Squash timing settings into one statement

Register CLKSEL hosts the configuration for both clock polarity
and data phase, and both values can be set in one write operation.

Squash the clock polarity and data phase register writes into
one statement, for efficiency.

Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---

v2: No change.

 drivers/spi/spi-rzv2m-csi.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-rzv2m-csi.c b/drivers/spi/spi-rzv2m-csi.c
index 038f1486b7d7..faf5898bc3e0 100644
--- a/drivers/spi/spi-rzv2m-csi.c
+++ b/drivers/spi/spi-rzv2m-csi.c
@@ -38,6 +38,7 @@
 /* CSI_CLKSEL */
 #define CSI_CLKSEL_CKP		BIT(17)
 #define CSI_CLKSEL_DAP		BIT(16)
+#define CSI_CLKSEL_MODE		(CSI_CLKSEL_CKP|CSI_CLKSEL_DAP)
 #define CSI_CLKSEL_SLAVE	BIT(15)
 #define CSI_CLKSEL_CKS		GENMASK(14, 1)
 
@@ -408,10 +409,8 @@ static int rzv2m_csi_setup(struct spi_device *spi)
 	writel(CSI_MODE_SETUP, csi->base + CSI_MODE);
 
 	/* Setup clock polarity and phase timing */
-	rzv2m_csi_reg_write_bit(csi, CSI_CLKSEL, CSI_CLKSEL_CKP,
-				!(spi->mode & SPI_CPOL));
-	rzv2m_csi_reg_write_bit(csi, CSI_CLKSEL, CSI_CLKSEL_DAP,
-				!(spi->mode & SPI_CPHA));
+	rzv2m_csi_reg_write_bit(csi, CSI_CLKSEL, CSI_CLKSEL_MODE,
+				~spi->mode & SPI_MODE_X_MASK);
 
 	/* Setup serial data order */
 	rzv2m_csi_reg_write_bit(csi, CSI_MODE, CSI_MODE_DIR,
-- 
2.34.1