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
next prev 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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