linux-kernel - [PATCH] spi: fsl-dspi: Set max_speed

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Date:	Tue, 22 Mar 2016 01:41:52 +0530
From:	Bhuvanchandra DV <bhuvanchandra.dv@...adex.com>
To:	<broonie@...nel.org>, <shawnguo@...nel.org>,
	<kernel@...gutronix.de>
CC:	<stefan@...er.ch>, <haikun.wang@...escale.com>, <han.xu@....com>,
	<linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Bhuvanchandra DV <bhuvanchandra.dv@...adex.com>
Subject: [PATCH] spi: fsl-dspi: Set max_speed_hz for master

Calculate and update max speed from bus clock for SoC's
using DSPI IP.

The bus clock factor's are taken from the data sheet's
of respective SoC's.

Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@...adex.com>
---
 drivers/spi/spi-fsl-dspi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 59a1143..8753276 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -121,18 +121,22 @@ enum dspi_trans_mode {
 
 struct fsl_dspi_devtype_data {
 	enum dspi_trans_mode trans_mode;
+	u8 max_clock_factor;
 };
 
 static const struct fsl_dspi_devtype_data vf610_data = {
 	.trans_mode = DSPI_EOQ_MODE,
+	.max_clock_factor = 2,
 };
 
 static const struct fsl_dspi_devtype_data ls1021a_v1_data = {
 	.trans_mode = DSPI_TCFQ_MODE,
+	.max_clock_factor = 8,
 };
 
 static const struct fsl_dspi_devtype_data ls2085a_data = {
 	.trans_mode = DSPI_TCFQ_MODE,
+	.max_clock_factor = 8,
 };
 
 struct fsl_dspi {
@@ -726,6 +730,9 @@ static int dspi_probe(struct platform_device *pdev)
 	}
 	clk_prepare_enable(dspi->clk);
 
+	master->max_speed_hz =
+		clk_get_rate(dspi->clk) / dspi->devtype_data->max_clock_factor;
+
 	init_waitqueue_head(&dspi->waitq);
 	platform_set_drvdata(pdev, master);
 
-- 
2.7.3