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

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Date: Fri, 28 Jun 2024 16:54:23 -0400
From: Jim Quinlan <james.quinlan@...adcom.com>
To: linux-pci@...r.kernel.org,
	Nicolas Saenz Julienne <nsaenz@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Cyril Brulebois <kibi@...ian.org>,
	Stanimir Varbanov <svarbanov@...e.de>,
	bcm-kernel-feedback-list@...adcom.com,
	jim2101024@...il.com,
	james.quinlan@...adcom.com
Cc: Florian Fainelli <florian.fainelli@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-rpi-kernel@...ts.infradead.org (moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE),
	linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 4/8] PCI: brcmstb: Use swinit reset if available

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@...adcom.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


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