#define XADC_ZYNQ_TCK_RATE_MAX 50000000
#define XADC_ZYNQ_IGAP_DEFAULT 20
+#define XADC_ZYNQ_PCAP_RATE_MAX 200000000
static int xadc_zynq_setup(struct platform_device *pdev,
struct iio_dev *indio_dev, int irq)
unsigned int div;
unsigned int igap;
unsigned int tck_rate;
+ int ret;
/* TODO: Figure out how to make igap and tck_rate configurable */
igap = XADC_ZYNQ_IGAP_DEFAULT;
if (!pcap_rate)
return -EINVAL;
+ if (pcap_rate > XADC_ZYNQ_PCAP_RATE_MAX) {
+ ret = clk_set_rate(xadc->clk,
+ (unsigned long)XADC_ZYNQ_PCAP_RATE_MAX);
+ if (ret)
+ return ret;
+ }
+
if (tck_rate > pcap_rate / 2) {
div = 2;
} else {
XADC_ZYNQ_CFG_REDGE | XADC_ZYNQ_CFG_WEDGE |
tck_div | XADC_ZYNQ_CFG_IGAP(igap));
+ if (pcap_rate > XADC_ZYNQ_PCAP_RATE_MAX) {
+ ret = clk_set_rate(xadc->clk, pcap_rate);
+ if (ret)
+ return ret;
+ }
+
return 0;
}