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Message-ID: <20181204053247.27022-1-xiaoning.wang@nxp.com>
Date: Tue, 4 Dec 2018 05:33:38 +0000
From: Clark Wang <xiaoning.wang@....com>
To: "broonie@...nel.org" <broonie@...nel.org>
CC: "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Clark Wang <xiaoning.wang@....com>
Subject: [PATCH] spi: lpspi: Add i.MX8 boards support for lpspi
Add both ipg and per clock for lpspi to support i.MX8QM/QXP boards.
Signed-off-by: Clark Wang <xiaoning.wang@....com>
---
drivers/spi/spi-fsl-lpspi.c | 52 +++++++++++++++++++++++++++++--------
1 file changed, 41 insertions(+), 11 deletions(-)
diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 08dcc3c22e88..5802f188051b 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -80,7 +80,8 @@ struct lpspi_config {
struct fsl_lpspi_data {
struct device *dev;
void __iomem *base;
- struct clk *clk;
+ struct clk *clk_ipg;
+ struct clk *clk_per;
bool is_slave;
void *rx_buf;
@@ -147,8 +148,19 @@ static int lpspi_prepare_xfer_hardware(struct spi_controller *controller)
{
struct fsl_lpspi_data *fsl_lpspi =
spi_controller_get_devdata(controller);
+ int ret;
+
+ ret = clk_prepare_enable(fsl_lpspi->clk_ipg);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(fsl_lpspi->clk_per);
+ if (ret) {
+ clk_disable_unprepare(fsl_lpspi->clk_ipg);
+ return ret;
+ }
- return clk_prepare_enable(fsl_lpspi->clk);
+ return 0;
}
static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller)
@@ -156,7 +168,8 @@ static int lpspi_unprepare_xfer_hardware(struct spi_controller *controller)
struct fsl_lpspi_data *fsl_lpspi =
spi_controller_get_devdata(controller);
- clk_disable_unprepare(fsl_lpspi->clk);
+ clk_disable_unprepare(fsl_lpspi->clk_ipg);
+ clk_disable_unprepare(fsl_lpspi->clk_per);
return 0;
}
@@ -249,7 +262,7 @@ static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi)
unsigned int perclk_rate, scldiv;
u8 prescale;
- perclk_rate = clk_get_rate(fsl_lpspi->clk);
+ perclk_rate = clk_get_rate(fsl_lpspi->clk_per);
for (prescale = 0; prescale < 8; prescale++) {
scldiv = perclk_rate /
(clkdivs[prescale] * config.speed_hz) - 2;
@@ -522,15 +535,30 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
goto out_controller_put;
}
- fsl_lpspi->clk = devm_clk_get(&pdev->dev, "ipg");
- if (IS_ERR(fsl_lpspi->clk)) {
- ret = PTR_ERR(fsl_lpspi->clk);
+ fsl_lpspi->clk_per = devm_clk_get(&pdev->dev, "per");
+ if (IS_ERR(fsl_lpspi->clk_per)) {
+ ret = PTR_ERR(fsl_lpspi->clk_per);
+ goto out_controller_put;
+ }
+
+ fsl_lpspi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+ if (IS_ERR(fsl_lpspi->clk_ipg)) {
+ ret = PTR_ERR(fsl_lpspi->clk_ipg);
+ goto out_controller_put;
+ }
+
+ ret = clk_prepare_enable(fsl_lpspi->clk_ipg);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "can't enable lpspi ipg clock, ret=%d\n", ret);
goto out_controller_put;
}
- ret = clk_prepare_enable(fsl_lpspi->clk);
+ ret = clk_prepare_enable(fsl_lpspi->clk_per);
if (ret) {
- dev_err(&pdev->dev, "can't enable lpspi clock, ret=%d\n", ret);
+ dev_err(&pdev->dev,
+ "can't enable lpspi per clock, ret=%d\n", ret);
+ clk_disable_unprepare(fsl_lpspi->clk_ipg);
goto out_controller_put;
}
@@ -538,7 +566,8 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
fsl_lpspi->txfifosize = 1 << (temp & 0x0f);
fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f);
- clk_disable_unprepare(fsl_lpspi->clk);
+ clk_disable_unprepare(fsl_lpspi->clk_per);
+ clk_disable_unprepare(fsl_lpspi->clk_ipg);
ret = devm_spi_register_controller(&pdev->dev, controller);
if (ret < 0) {
@@ -560,7 +589,8 @@ static int fsl_lpspi_remove(struct platform_device *pdev)
struct fsl_lpspi_data *fsl_lpspi =
spi_controller_get_devdata(controller);
- clk_disable_unprepare(fsl_lpspi->clk);
+ clk_disable_unprepare(fsl_lpspi->clk_per);
+ clk_disable_unprepare(fsl_lpspi->clk_ipg);
return 0;
}
--
2.17.1
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