Add basic clock support. The clocks are requested at probe
and released at remove.
Signed-off-by: Shubhrajyoti Datta <shubhraj@xxxxxxxxxx>
---
v3 changes:
Do not fail probe if no clock is given
Add a clk name
Fix some space errors
drivers/spi/spi-xilinx.c | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index 3009121..426ce12 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -21,6 +21,7 @@
#include <linux/spi/spi_bitbang.h>
#include <linux/spi/xilinx_spi.h>
#include <linux/io.h>
+#include <linux/clk.h>
#define XILINX_SPI_MAX_CS 32
@@ -83,6 +84,7 @@ struct xilinx_spi {
struct spi_bitbang bitbang;
struct completion done;
void __iomem *regs; /* virt. address of the control registers */
+ struct clk *clk;
int irq;
@@ -428,6 +430,22 @@ static int xilinx_spi_probe(struct platform_device *pdev)
goto put_master;
}
+ xspi->clk = devm_clk_get(&pdev->dev, "spi_fclk");
+ if (IS_ERR(xspi->clk)) {
+ if (PTR_ERR(xspi->clk) == -ENOENT) {
+ xspi->clk = NULL;
+ } else {
+ ret = PTR_ERR(xspi->clk);
+ goto put_master;
+ }
+ }
+
+ ret = clk_prepare_enable(xspi->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to enable clock.\n");
+ goto put_master;
+ }
+
master->bus_num = pdev->id;
master->num_chipselect = num_cs;
master->dev.of_node = pdev->dev.of_node;
@@ -485,6 +503,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
put_master:
spi_master_put(master);
+ clk_disable_unprepare(xspi->clk);
return ret;
}
@@ -503,6 +522,7 @@ static int xilinx_spi_remove(struct platform_device *pdev)
xspi->write_fn(0, regs_base + XIPIF_V123B_DGIER_OFFSET);
spi_master_put(xspi->bitbang.master);
+ clk_disable_unprepare(xspi->clk);
return 0;
}
--
1.7.1
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