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 V3 27/29] PCI: OF: Add of_pci_get_reset_gpio() to parse reset-gpios from DT
Date: Mon, 13 May 2019 23:37:42 +0530 [thread overview]
Message-ID: <20190513180744.16493-28-mmaddireddy@nvidia.com> (raw)
In-Reply-To: <20190513180744.16493-1-mmaddireddy@nvidia.com>
This new helper function could be used by host drivers to get the reset
GPIO descriptor. If the property isn't assigned, it will return NULL to
the caller.
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
---
V3: New patch to add helper function to parse "reset-gpios"
drivers/pci/of.c | 18 ++++++++++++++++++
include/linux/of_pci.h | 10 ++++++++++
2 files changed, 28 insertions(+)
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 9454c90980c9..2a0282115ff0 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -6,6 +6,7 @@
*/
#define pr_fmt(fmt) "PCI: OF: " fmt
+#include <linux/gpio/consumer.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@@ -224,6 +225,23 @@ int of_pci_get_max_link_speed(struct device_node *node)
}
EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
+/**
+ * of_pci_get_reset_gpio() - Get PCI reset gpio descriptor.
+ *
+ * @node: device node
+ *
+ * Returns PCI reset gpio descriptor from DT, or an ERR_PTR() if the
+ * required property is invalid.
+ */
+struct gpio_desc *of_pci_get_reset_gpio(struct device *dev,
+ struct device_node *node,
+ int dflags, char *label)
+{
+ return devm_gpiod_get_from_of_node(dev, node, "reset-gpios", 0, dflags,
+ label);
+}
+EXPORT_SYMBOL_GPL(of_pci_get_reset_gpio);
+
/**
* of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
* is present and valid
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index 21a89c4880fa..230ddc813ef9 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -13,6 +13,9 @@ struct device_node;
struct device_node *of_pci_find_child_device(struct device_node *parent,
unsigned int devfn);
int of_pci_get_devfn(struct device_node *np);
+struct gpio_desc *of_pci_get_reset_gpio(struct device *dev,
+ struct device_node *np,
+ int dflags, char *label);
void of_pci_check_probe_only(void);
#else
static inline struct device_node *of_pci_find_child_device(struct device_node *parent,
@@ -26,6 +29,13 @@ static inline int of_pci_get_devfn(struct device_node *np)
return -EINVAL;
}
+static inline struct gpio_desc *of_pci_get_reset_gpio(struct device *dev,
+ struct device_node *np,
+ int dflags, char *label)
+{
+ return -EINVAL;
+}
+
static inline void of_pci_check_probe_only(void) { }
#endif
--
2.17.1
next prev parent reply other threads:[~2019-05-13 18:09 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-13 18:07 [PATCH V3 00/29] Enable Tegra PCIe root port features Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 01/29] soc/tegra: pmc: Export tegra_powergate_power_on() Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 02/29] PCI: tegra: Handle failure cases in tegra_pcie_power_on() Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 03/29] PCI: tegra: Rearrange Tegra PCIe driver functions Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 04/29] PCI: tegra: Mask AFI_INTR in runtime suspend Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 05/29] PCI: tegra: Fix PCIe host power up sequence Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 06/29] PCI: tegra: Add PCIe Gen2 link speed support Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 07/29] PCI: tegra: Advertise PCIe Advanced Error Reporting (AER) capability Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 08/29] PCI: tegra: Program UPHY electrical settings for Tegra210 Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 09/29] PCI: tegra: Enable opportunistic UpdateFC and ACK Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 10/29] PCI: tegra: Disable AFI dynamic clock gating Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 11/29] PCI: tegra: Process pending DLL transactions before entering L1 or L2 Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 12/29] PCI: tegra: Enable PCIe xclk clock clamping Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 13/29] PCI: tegra: Increase the deskew retry time Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 14/29] PCI: tegra: Add SW fixup for RAW violations Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 15/29] PCI: tegra: Update flow control timer frequency in Tegra210 Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 16/29] PCI: tegra: Set target speed as Gen1 before starting LTSSM Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 17/29] PCI: tegra: Fix PLLE power down issue due to CLKREQ# signal Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 18/29] PCI: tegra: Program AFI_CACHE* registers only for Tegra20 Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 19/29] PCI: tegra: Change PRSNT_SENSE IRQ log to debug Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 20/29] PCI: tegra: Use legacy IRQ for port service drivers Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 21/29] PCI: tegra: Add AFI_PEX2_CTRL reg offset as part of soc struct Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 22/29] PCI: tegra: Access endpoint config only if PCIe link is up Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 23/29] dt-bindings: pci: tegra: Document PCIe DPD pinctrl optional prop Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 24/29] arm64: tegra: Add PEX DPD states as pinctrl properties Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 25/29] PCI: tegra: Put PEX CLK & BIAS pads in DPD mode Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 26/29] PCI: Add DT binding for "reset-gpios" property Manikanta Maddireddy
2019-05-14 18:23 ` Rob Herring
2019-05-13 18:07 ` Manikanta Maddireddy [this message]
2019-05-14 18:31 ` [PATCH V3 27/29] PCI: OF: Add of_pci_get_reset_gpio() to parse reset-gpios from DT Rob Herring
2019-05-16 5:50 ` Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 28/29] PCI: tegra: Add support for GPIO based PERST# Manikanta Maddireddy
2019-05-13 18:07 ` [PATCH V3 29/29] PCI: tegra: Change link retry log level to debug Manikanta Maddireddy
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