spi: fsl_qspi: add clock handling

Add support for the clocks used by the SpacemiT K3 QSPI
controller by retrieving and enabling the qspi_en and qspi
clocks during probe.

Signed-off-by: Jichuan Feng<jichuan.or@isrc.iscas.ac.cn>

drivers/spi/fsl_qspi.c

@@ -38,6 +38,7 @@
 #include <linux/sizes.h>
 #include <linux/err.h>
 #include <asm/io.h>
+#include <clk.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -271,6 +272,10 @@ struct fsl_qspi {
 	struct udevice *dev;
 	void __iomem *iobase;
 	void __iomem *ahb_addr;
+#if CONFIG_IS_ENABLED(CLK)
+	struct clk clk_en;
+	struct clk clk;
+#endif
 	u32 memmap_phy;
 	u32 memmap_size;
 	const struct fsl_qspi_devtype_data *devtype_data;
@@ -820,7 +825,21 @@ static int fsl_qspi_probe(struct udevice *bus)
 
 	dm_bus->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
 					66000000);
+#if CONFIG_IS_ENABLED(CLK)
+	ret = clk_get_by_name(bus, "qspi_en", &q->clk_en);
+	if (ret) {
+		dev_err(bus, "cannot find qspi_en clock\n");
+		return ret;
+	}
+	ret = clk_get_by_name(bus, "qspi", &q->clk);
+	if (ret) {
+		dev_err(bus, "cannot find qspi clock\n");
+		return ret;
+	}
 
+	clk_enable(&q->clk_en);
+	clk_enable(&q->clk);
+#endif
 	fsl_qspi_default_setup(q);
 
 	return 0;