linux-kernel - [PATCH 1/2] spi: fsl-lpspi: remove unneeded array

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Date:   Thu, 20 Feb 2020 14:11:48 +0000
From:   Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
To:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Oleksandr Suvorov <cryosay@...il.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Igor Opanyuk <igor.opanyuk@...adex.com>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 1/2] spi: fsl-lpspi: remove unneeded array

- replace the array with the shift operation
- remove the extra comparing operation.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
---

 drivers/spi/spi-fsl-lpspi.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index d0b8cc741a24..298329b781d2 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -86,8 +86,6 @@
 #define TCR_RXMSK	BIT(19)
 #define TCR_TXMSK	BIT(18)
 
-static int clkdivs[] = {1, 2, 4, 8, 16, 32, 64, 128};
-
 struct lpspi_config {
 	u8 bpw;
 	u8 chip_select;
@@ -331,15 +329,14 @@ static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi)
 	}
 
 	for (prescale = 0; prescale < 8; prescale++) {
-		scldiv = perclk_rate /
-			 (clkdivs[prescale] * config.speed_hz) - 2;
+		scldiv = perclk_rate / config.speed_hz / (1 << prescale) - 2;
 		if (scldiv < 256) {
 			fsl_lpspi->config.prescale = prescale;
 			break;
 		}
 	}
 
-	if (prescale == 8 && scldiv >= 256)
+	if (scldiv >= 256)
 		return -EINVAL;
 
 	writel(scldiv | (scldiv << 8) | ((scldiv >> 1) << 16),
-- 
2.24.1