The IP relies on a gated clock. When we will add S2RAM support, this
clock will need to be resumed before any PCIe registers are
accessed. Add support for this clock.
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
drivers/pci/controller/pci-aardvark.c | 29 +++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 0f50163ae072..b1b8897d2d28 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -8,6 +8,7 @@
* Author: Hezi Shahmoon <hezi.shahmoon@xxxxxxxxxxx>
*/
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
@@ -187,6 +188,7 @@
struct advk_pcie {
struct platform_device *pdev;
+ struct clk *clk;
void __iomem *base;
struct list_head resources;
struct irq_domain *irq_domain;
@@ -973,6 +975,29 @@ static int advk_pcie_parse_request_of_pci_ranges(struct advk_pcie *pcie)
return err;
}
+static int advk_pcie_setup_clk(struct advk_pcie *pcie)
+{
+ struct device *dev = &pcie->pdev->dev;
+ int ret;
+
+ pcie->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(pcie->clk) && (PTR_ERR(pcie->clk) == -EPROBE_DEFER))
+ return PTR_ERR(pcie->clk);
+
+ /* Old bindings miss the clock handle */
+ if (IS_ERR(pcie->clk)) {
+ dev_warn(dev, "Clock unavailable (%ld)\n", PTR_ERR(pcie->clk));
+ pcie->clk = NULL;
+ return 0;
+ }
+
+ ret = clk_prepare_enable(pcie->clk);
+ if (ret)
+ dev_err(dev, "Clock initialization failed (%d)\n", ret);
+
+ return ret;
+}
+
static int advk_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -1008,6 +1033,10 @@ static int advk_pcie_probe(struct platform_device *pdev)
return ret;
}
+ ret = advk_pcie_setup_clk(pcie);
+ if (ret)
+ return ret;
+
advk_pcie_setup_hw(pcie);
advk_sw_pci_bridge_init(pcie);
--
2.19.1
