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From: Manikanta Maddireddy <mmaddireddy@nvidia.com>
To: <thierry.reding@gmail.com>, <bhelgaas@google.com>,
	<robh+dt@kernel.org>, <mark.rutland@arm.com>,
	<jonathanh@nvidia.com>, <lorenzo.pieralisi@arm.com>,
	<vidyas@nvidia.com>
Cc: <linux-tegra@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<devicetree@vger.kernel.org>,
	Manikanta Maddireddy <mmaddireddy@nvidia.com>
Subject: [PATCH 27/30] PCI: tegra: Add support to configure platform GPIOs
Date: Thu, 11 Apr 2019 22:33:52 +0530
Message-ID: <20190411170355.6882-28-mmaddireddy@nvidia.com> (raw)
In-Reply-To: <20190411170355.6882-1-mmaddireddy@nvidia.com>

Few endpoints provides gpio control to its internal regulators or PCIe
interface. For example, few Wi-Fi chips provide gpio control to turn ON
or OFF internal regulators and RTL8111 NIC card provides a gpio control
to stop sampling PCIe Rx lane & driving Tx lane.

Add generic support to configure platform specific GPIOs of both
active high and low types before going for PCIe link up.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
---
 drivers/pci/controller/pci-tegra.c | 59 ++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 92c6daa0de84..4a91c9fb3a9d 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -403,6 +403,9 @@ struct tegra_pcie_port {
 	unsigned int lanes;
 
 	struct phy **phys;
+
+	int n_gpios;
+	int *gpios;
 };
 
 struct tegra_pcie_bus {
@@ -1359,6 +1362,17 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
 	return err;
 }
 
+static void tegra_pcie_config_plat(struct tegra_pcie *pcie, bool set)
+{
+	struct tegra_pcie_port *port;
+	int count;
+
+	list_for_each_entry(port, &pcie->ports, list) {
+		for (count = 0; count < port->n_gpios; ++count)
+			gpiod_set_value(gpio_to_desc(port->gpios[count]), set);
+	}
+}
+
 static int tegra_pcie_clocks_get(struct tegra_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
@@ -2191,6 +2205,45 @@ static int tegra_pcie_parse_pinctrl(struct tegra_pcie *pcie)
 	return err;
 }
 
+static int tegra_pcie_parse_plat_dt(struct tegra_pcie_port *port,
+				    struct device_node *np)
+{
+	struct device *dev = port->pcie->dev;
+	int count, gpio, err;
+	enum of_gpio_flags flags;
+	unsigned long f;
+
+	port->n_gpios = of_gpio_named_count(np, "nvidia,plat-gpios");
+	if (port->n_gpios > 0) {
+		port->gpios = devm_kzalloc(dev, port->n_gpios * sizeof(int),
+					   GFP_KERNEL);
+		if (!port->gpios)
+			return -ENOMEM;
+
+		for (count = 0; count < port->n_gpios; ++count) {
+			gpio = of_get_named_gpio_flags(np, "nvidia,plat-gpios",
+						       count, &flags);
+			if (!gpio_is_valid(gpio)) {
+				dev_err(dev, "invalid gpio: %d\n", gpio);
+				return gpio;
+			}
+
+			f = (flags & OF_GPIO_ACTIVE_LOW) ?
+			    (GPIOF_OUT_INIT_LOW | GPIOF_ACTIVE_LOW) :
+			    GPIOF_OUT_INIT_HIGH;
+
+			err = devm_gpio_request_one(dev, gpio, f, NULL);
+			if (err < 0) {
+				dev_err(dev, "gpio %d request failed\n", gpio);
+				return err;
+			}
+			port->gpios[count] = gpio;
+		}
+	}
+
+	return 0;
+}
+
 static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
@@ -2332,6 +2385,10 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 		if (IS_ERR(rp->base))
 			return PTR_ERR(rp->base);
 
+		err = tegra_pcie_parse_plat_dt(rp, port);
+		if (err < 0)
+			return err;
+
 		list_add_tail(&rp->list, &pcie->ports);
 	}
 
@@ -2917,6 +2974,7 @@ static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev)
 	if (pcie->soc->config_pex_io_dpd)
 		pinctrl_select_state(pcie->pex_pinctrl, pcie->pex_dpd_enable);
 	tegra_pcie_power_off(pcie);
+	tegra_pcie_config_plat(pcie, 0);
 
 	return 0;
 }
@@ -2926,6 +2984,7 @@ static int __maybe_unused tegra_pcie_pm_resume(struct device *dev)
 	struct tegra_pcie *pcie = dev_get_drvdata(dev);
 	int err;
 
+	tegra_pcie_config_plat(pcie, 1);
 	err = tegra_pcie_power_on(pcie);
 	if (err) {
 		dev_err(dev, "tegra pcie power on fail: %d\n", err);
-- 
2.17.1


  parent reply index

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-11 17:03 [PATCH 00/30] Enable Tegra PCIe root port features Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 01/30] soc/tegra: pmc: Export tegra_powergate_power_on() Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 02/30] PCI: tegra: Fix PCIe host power up sequence Manikanta Maddireddy
2019-04-15 11:01   ` Thierry Reding
2019-04-15 14:11     ` Manikanta Maddireddy
2019-04-15 14:30       ` Thierry Reding
2019-04-15 18:14         ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 03/30] PCI: tegra: Move REFCLK pad settings out of phy_power_on() Manikanta Maddireddy
2019-04-15 11:06   ` Thierry Reding
2019-04-15 14:20     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 04/30] PCI: tegra: Add PCIe Gen2 link speed support Manikanta Maddireddy
2019-04-15 11:21   ` Thierry Reding
2019-04-15 14:47     ` Manikanta Maddireddy
2019-04-15 15:36       ` Thierry Reding
2019-04-15 15:53         ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 05/30] PCI: tegra: Advertise PCIe Advanced Error Reporting (AER) capability Manikanta Maddireddy
2019-04-15 11:23   ` Thierry Reding
2019-04-15 14:49     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 06/30] PCI: tegra: Program UPHY electrical settings for Tegra210 Manikanta Maddireddy
2019-04-15 11:29   ` Thierry Reding
2019-04-15 14:55     ` Manikanta Maddireddy
2019-04-15 15:38       ` Thierry Reding
2019-04-11 17:03 ` [PATCH 07/30] PCI: tegra: Enable opportunistic update FC and ACK Manikanta Maddireddy
2019-04-15 11:30   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 08/30] PCI: tegra: Disable AFI dynamic clock gating Manikanta Maddireddy
2019-04-15 11:32   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 09/30] PCI: tegra: Process pending DLL transactions before entering L1 or L2 Manikanta Maddireddy
2019-04-15 11:33   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 10/30] PCI: tegra: Enable PCIe xclk clock clamping Manikanta Maddireddy
2019-04-15 11:37   ` Thierry Reding
2019-04-15 14:58     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 11/30] PCI: tegra: Increase the deskew retry time Manikanta Maddireddy
2019-04-15 11:39   ` Thierry Reding
2019-04-15 14:58     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 12/30] PCI: tegra: Add SW fixup for RAW violations Manikanta Maddireddy
2019-04-11 20:01   ` Bjorn Helgaas
2019-04-12  5:59     ` Manikanta Maddireddy
2019-04-15 11:41       ` Thierry Reding
2019-04-15 11:45   ` Thierry Reding
2019-04-15 15:02     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 13/30] PCI: tegra: Update flow control threshold in Tegra210 Manikanta Maddireddy
2019-04-15 11:47   ` Thierry Reding
2019-04-15 15:05     ` Manikanta Maddireddy
2019-04-23  9:27       ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 14/30] PCI: tegra: Set target speed as Gen1 before link up Manikanta Maddireddy
2019-04-11 20:04   ` Bjorn Helgaas
2019-04-12  6:44     ` Manikanta Maddireddy
2019-04-12 14:35       ` Bjorn Helgaas
2019-04-15 10:43         ` Manikanta Maddireddy
2019-04-15 11:52   ` Thierry Reding
2019-04-15 15:12     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 15/30] PCI: tegra: Fix PLLE powerdown issue due to CLKREQ# signal Manikanta Maddireddy
2019-04-15 13:17   ` Thierry Reding
2019-04-15 15:14     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 16/30] PCI: tegra: Program AFI_CACHE* registers only for Tegra20 Manikanta Maddireddy
2019-04-15 13:20   ` Thierry Reding
2019-04-16 10:47     ` Manikanta Maddireddy
2019-04-16 16:11       ` Thierry Reding
2019-04-11 17:03 ` [PATCH 17/30] PCI: tegra: Use switch statements in tegra_pcie_isr() Manikanta Maddireddy
2019-04-15 13:25   ` Thierry Reding
2019-04-15 15:25     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 18/30] PCI: tegra: Change PRSNT_SENSE irq log to debug Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 19/30] PCI: tegra: Use legacy irq for port service drivers Manikanta Maddireddy
2019-04-15 13:35   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 20/30] PCI: tegra: Add AFI_PEX2_CTRL reg offset as part of soc struct Manikanta Maddireddy
2019-04-15 13:31   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 21/30] PCI: tegra: Add "pci" type check before parsing child device tree node Manikanta Maddireddy
2019-04-15 13:37   ` Thierry Reding
2019-04-15 15:30     ` Manikanta Maddireddy
2019-04-15 15:42       ` Thierry Reding
2019-04-11 17:03 ` [PATCH 22/30] PCI: tegra: Access endpoint config only if PCIe link is up Manikanta Maddireddy
2019-04-11 20:15   ` Bjorn Helgaas
2019-04-12  7:00     ` Manikanta Maddireddy
2019-04-12 14:50       ` Bjorn Helgaas
2019-04-15 11:36         ` Manikanta Maddireddy
2019-04-15 13:45           ` Thierry Reding
2019-04-15 13:52             ` Thierry Reding
2019-04-15 14:04           ` Bjorn Helgaas
2019-04-15 15:43             ` Manikanta Maddireddy
2019-04-23 20:24               ` Bjorn Helgaas
2019-04-11 17:03 ` [PATCH 23/30] dt-bindings: pci: tegra: Document PCIe DPD pinctrl optional prop Manikanta Maddireddy
2019-04-15 14:07   ` Thierry Reding
2019-04-15 15:48     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 24/30] arm64: tegra: Add PEX DPD states as pinctrl properties Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 25/30] PCI: tegra: Put PEX CLK & BIAS pads in DPD mode Manikanta Maddireddy
2019-04-15 14:11   ` Thierry Reding
2019-04-11 17:03 ` [PATCH 26/30] dt-bindings: pci: tegra: Document nvidia,plat-gpios optional prop Manikanta Maddireddy
2019-04-11 20:18   ` Bjorn Helgaas
2019-04-12  7:01     ` Manikanta Maddireddy
2019-04-15 14:16   ` Thierry Reding
2019-04-15 17:58     ` Manikanta Maddireddy
2019-04-16 15:34       ` Thierry Reding
2019-04-17 11:22         ` Manikanta Maddireddy
2019-04-17 15:19           ` Thierry Reding
2019-04-17 18:26             ` Manikanta Maddireddy
2019-04-11 17:03 ` Manikanta Maddireddy [this message]
2019-04-11 17:03 ` [PATCH 28/30] dt-bindings: pci: tegra: Document nvidia,rst-gpio " Manikanta Maddireddy
2019-04-15 14:20   ` Thierry Reding
2019-04-15 18:01     ` Manikanta Maddireddy
2019-04-29 18:33     ` Rob Herring
2019-04-11 17:03 ` [PATCH 29/30] PCI: tegra: Add support for GPIO based PCIe reset Manikanta Maddireddy
2019-04-15 14:20   ` Thierry Reding
2019-04-15 18:03     ` Manikanta Maddireddy
2019-04-11 17:03 ` [PATCH 30/30] PCI: tegra: Change link retry log level to INFO Manikanta Maddireddy
2019-04-15 14:23   ` Thierry Reding
2019-04-15 18:05     ` Manikanta Maddireddy

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