This patch adds automatic configuration of the TCSR phy mux register based on
the syscon-tcsr devicetree entry. This configuration is optional, as some
platforms may not require the mux selection.
Signed-off-by: Andy Gross <agross@xxxxxxxxxxxxxx>
---
drivers/usb/dwc3/dwc3-qcom.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
index 0880260..fcf264c 100644
--- a/drivers/usb/dwc3/dwc3-qcom.c
+++ b/drivers/usb/dwc3/dwc3-qcom.c
@@ -17,6 +17,8 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
struct dwc3_qcom {
struct device *dev;
@@ -30,6 +32,9 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct dwc3_qcom *qdwc;
+ struct regmap *regmap;
+ u32 mux_offset;
+ u32 mux_bit;
int ret;
qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
@@ -58,6 +63,26 @@ static int dwc3_qcom_probe(struct platform_device *pdev)
qdwc->sleep_clk = NULL;
}
+ /* look for tcsr and if present, provision it */
+ regmap = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr");
+ if (!IS_ERR(regmap)) {
+ if (of_property_read_u32_index(node, "syscon-tcsr", 1,
+ &mux_offset)) {
+ dev_err(qdwc->dev, "missing USB TCSR mux offset\n");
+ return -EINVAL;
+ }
+ if (of_property_read_u32_index(node, "syscon-tcsr", 2,
+ &mux_bit)) {
+ dev_err(qdwc->dev, "missing USB TCSR mux bit\n");
+ return -EINVAL;
+ }
+
+ regmap_update_bits(regmap, mux_offset, BIT(mux_bit),
+ BIT(mux_bit));
+ } else {
+ dev_info(qdwc->dev, "missing syscon tcsr entry\n");
+ }
+
ret = clk_prepare_enable(qdwc->core_clk);
if (ret) {
dev_err(qdwc->dev, "failed to enable core clock\n");
--
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hosted by The Linux Foundation
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