[PATCH v1 4/8] PCI: brcmstb: Use swinit reset if available

Jim Quinlan
2024-06-28T20:56:00Z

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The 7712 SOC adds a software init reset device for the PCIe HW.
If found in the DT node, use it.

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
---
drivers/pci/controller/pcie-brcmstb.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 4104c3668fdb..0f1c3e1effb1 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -266,6 +266,7 @@ struct brcm_pcie {
struct reset_control *rescal;
struct reset_control *perst_reset;
struct reset_control *bridge;
+ struct reset_control *swinit;
int num_memc;
u64 memc_size[PCIE_BRCM_MAX_MEMC];
u32 hw_rev;
@@ -1626,6 +1627,25 @@ static int brcm_pcie_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "could not enable clock\n");
return ret;
}
+
+ pcie->swinit = devm_reset_control_get_optional_exclusive(&pdev->dev, "swinit");
+ if (IS_ERR(pcie->swinit)) {
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(pcie->swinit),
+ "failed to get 'swinit' reset\n");
+ goto clk_out;
+ }
+
+ ret = reset_control_assert(pcie->swinit);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret, "could not assert reset 'swinit'\n");
+ goto clk_out;
+ } else {
+ ret = dev_err_probe(&pdev->dev, reset_control_deassert(pcie->swinit),
+ "could not de-assert reset 'swinit' after asserting\n");
+ if (ret)
+ goto clk_out;
+ }
+
pcie->rescal = devm_reset_control_get_optional_shared(&pdev->dev, "rescal");
if (IS_ERR(pcie->rescal)) {
ret = PTR_ERR(pcie->rescal);
--
2.17.1