[PATCHv2 2/3] spi/spi-xilinx: Add clock support

@@ -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 +430,15 @@ static int xilinx_spi_probe(struct platform_device *pdev)
 		goto put_master;
 	}
 
+	xspi->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(xspi->clk)) {
+		dev_err(&pdev->dev, "input clock not found.\n");
+		return PTR_ERR(xspi->clk);
+	}
+	ret = clk_prepare_enable(xspi->clk);
+	if (ret)
+		dev_err(&pdev->dev, "Unable to enable clock.\n");
+
 	master->bus_num = pdev->id;
 	master->num_chipselect = num_cs;
 	master->dev.of_node = pdev->dev.of_node;

@@ -485,6 +496,7 @@ static int xilinx_spi_probe(struct platform_device *pdev)
 
 put_master:
 	spi_master_put(master);
+	clk_disable_unprepare(xspi->clk);
 
 	return ret;
 }

@@ -503,6 +515,7 @@ 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;
 }