Introduce the helper function ks_pcie_host_deinit() to undo the
configuration performed by the ks_pcie_host_init() function and also to
free the MSI Domains if the '.msi_init' callback was implemented which
would have made a call to dw_pcie_allocate_domains().

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
---

v1: https://lore.kernel.org/r/20250903124505.365913-8-s-vadapalli@ti.com/
No changes since v1.

 drivers/pci/controller/dwc/pci-keystone.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 074566fb1d74..3a3188e89a2a 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -885,6 +885,18 @@ static int ks_pcie_init_id(struct keystone_pcie *ks_pcie)
 	return 0;
 }
 
+static void ks_pcie_host_deinit(struct dw_pcie_rp *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct keystone_pcie *ks_pcie = to_keystone_pcie(pci);
+
+	ks_pcie_stop_link(pci);
+	ks_pcie_free_msi_irq(ks_pcie);
+	ks_pcie_free_intx_irq(ks_pcie);
+	if (pci->pp.ops->msi_init)
+		dw_pcie_free_domains(pp);
+}
+
 static int ks_pcie_host_init(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -929,11 +941,13 @@ static int ks_pcie_host_init(struct dw_pcie_rp *pp)
 
 static const struct dw_pcie_host_ops ks_pcie_host_ops = {
 	.init = ks_pcie_host_init,
+	.deinit = ks_pcie_host_deinit,
 	.msi_init = ks_pcie_msi_host_init,
 };
 
 static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = {
 	.init = ks_pcie_host_init,
+	.deinit = ks_pcie_host_deinit,
 };
 
 static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv)
-- 
2.43.0