PCI: dwc/intel-gw: Move ATU offset out of driver match data

The ATU offset should be a register range in DT called 'atu', not driver
match data. Any future platforms with a different ATU offset should add
it to their DT.

This is also in preparation to do DBI resource setup in the core DWC
code, so let's move setting atu_base later in intel_pcie_rc_setup().

Link: https://lore.kernel.org/r/20201105211159.1814485-3-robh@kernel.org
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/controller/dwc/pcie-intel-gw.c

@@ -58,7 +58,6 @@
 
 struct intel_pcie_soc {
 	unsigned int	pcie_ver;
-	unsigned int	pcie_atu_offset;
 	u32		num_viewport;
 };
 
@@ -155,11 +154,15 @@ static void intel_pcie_init_n_fts(struct dw_pcie *pci)
 
 static void intel_pcie_rc_setup(struct intel_pcie_port *lpp)
 {
+	struct dw_pcie *pci = &lpp->pci;
+
+	pci->atu_base = pci->dbi_base + 0xC0000;
+
 	intel_pcie_ltssm_disable(lpp);
 	intel_pcie_link_setup(lpp);
-	intel_pcie_init_n_fts(&lpp->pci);
-	dw_pcie_setup_rc(&lpp->pci.pp);
-	dw_pcie_upconfig_setup(&lpp->pci);
+	intel_pcie_init_n_fts(pci);
+	dw_pcie_setup_rc(&pci->pp);
+	dw_pcie_upconfig_setup(pci);
 }
 
 static int intel_pcie_ep_rst_init(struct intel_pcie_port *lpp)
@@ -425,7 +428,6 @@ static const struct dw_pcie_host_ops intel_pcie_dw_ops = {
 
 static const struct intel_pcie_soc pcie_data = {
 	.pcie_ver =		0x520A,
-	.pcie_atu_offset =	0xC0000,
 	.num_viewport =		3,
 };
 
@@ -461,7 +463,6 @@ static int intel_pcie_probe(struct platform_device *pdev)
 
 	pci->ops = &intel_pcie_ops;
 	pci->version = data->pcie_ver;
-	pci->atu_base = pci->dbi_base + data->pcie_atu_offset;
 	pp->ops = &intel_pcie_dw_ops;
 
 	ret = dw_pcie_host_init(pp);