[PATCH v3 0/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

[PATCH v3 0/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

[Thomas Petazzoni]

Hello,

Here is the third iteration of the PCIe host controller driver needed
for the ARM64 Marvell Armada 7K/8K platform.

Changes since v2:

 - Added Rob Herring's Acked-by on the Device Tree binding patch.

 - Reworked the PCIe host driver following the suggestion of Bjorn
   Helgaas: creation of armada8k_add_pcie_port() and
   armada8k_pcie_establish_link() in order to follow the convention of
   other Designware based drivers.

Thanks!

Thomas

Thomas Petazzoni (2):
  dt-bindings: pci: add DT binding for Marvell Armada 7K/8K PCIe
    controller
  pci: host: new driver for Marvell Armada 7K/8K PCIe controller

 .../devicetree/bindings/pci/pci-armada8k.txt       |  38 +++
 drivers/pci/host/Kconfig                           |  11 +
 drivers/pci/host/Makefile                          |   1 +
 drivers/pci/host/pcie-armada8k.c                   | 276 +++++++++++++++++++++
 4 files changed, 326 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
 create mode 100644 drivers/pci/host/pcie-armada8k.c

-- 
2.6.4

[PATCH v3 1/2] dt-bindings: pci: add DT binding for Marvell Armada 7K/8K PCIe controller

[Thomas Petazzoni]

This commit adds the Device Tree binding documentation that allows to
describe the PCIe controller found in Marvell Armada 7K/8K SoCs.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Rob Herring <rob@kernel.org>
---
 .../devicetree/bindings/pci/pci-armada8k.txt       | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt

diff --git a/Documentation/devicetree/bindings/pci/pci-armada8k.txt b/Documentation/devicetree/bindings/pci/pci-armada8k.txt
new file mode 100644
index 0000000..598533a
--- /dev/null
+++ b/Documentation/devicetree/bindings/pci/pci-armada8k.txt
@@ -0,0 +1,38 @@
+* Marvell Armada 7K/8K PCIe interface
+
+This PCIe host controller is based on the Synopsis Designware PCIe IP
+and thus inherits all the common properties defined in designware-pcie.txt.
+
+Required properties:
+- compatible: "marvell,armada8k-pcie"
+- reg: must contain two register regions
+   - the control register region
+   - the config space region
+- reg-names:
+   - "ctrl" for the control register region
+   - "config" for the config space region
+- interrupts: Interrupt specifier for the PCIe controler
+- clocks: reference to the PCIe controller clock
+
+Example:
+
+	pcie at f2600000 {
+		compatible = "marvell,armada8k-pcie", "snps,dw-pcie";
+		reg = <0 0xf2600000 0 0x10000>, <0 0xf6f00000 0 0x80000>;
+		reg-names = "ctrl", "config";
+		#address-cells = <3>;
+		#size-cells = <2>;
+		#interrupt-cells = <1>;
+		device_type = "pci";
+		dma-coherent;
+
+		bus-range = <0 0xff>;
+		ranges = <0x81000000 0 0xf9000000 0  0xf9000000 0 0x10000	/* downstream I/O */
+			  0x82000000 0 0xf6000000 0  0xf6000000 0 0xf00000>;	/* non-prefetchable memory */
+		interrupt-map-mask = <0 0 0 0>;
+		interrupt-map = <0 0 0 0 &gic 0 GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+		interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+		num-lanes = <1>;
+		clocks = <&cpm_syscon0 1 13>;
+		status = "disabled";
+	};
-- 
2.6.4

[PATCH v3 2/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

[Thomas Petazzoni]

The Marvell Armada 7K/8K SoCs integrate a PCIe controller from
Synopsys. This commit adds a new driver that provides the small glue
needed to use the existing Designware driver to make it work on
Marvell Armada 7K/8K SoCs.

The MSI support will be enabled at a later point.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 drivers/pci/host/Kconfig         |  11 ++
 drivers/pci/host/Makefile        |   1 +
 drivers/pci/host/pcie-armada8k.c | 276 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 288 insertions(+)
 create mode 100644 drivers/pci/host/pcie-armada8k.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 7a0780d..a3b6f24 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -231,4 +231,15 @@ config PCI_HOST_THUNDER_ECAM
 	help
 	  Say Y here if you want ECAM support for CN88XX-Pass-1.x Cavium Thunder SoCs.
 
+config PCIE_ARMADA_8K
+	bool "Marvell Armada-8K PCIe controller"
+	depends on ARCH_MVEBU
+	select PCIE_DW
+	select PCIEPORTBUS
+	help
+	  Say Y here if you want to enable PCIe controller support on
+	  Armada-8K SoCs. The PCIe controller on Armada-8K is based on
+	  Designware hardware and therefore the driver re-uses the
+	  Designware core functions to implement the driver.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index d85b5fa..a6f85e3 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_PCI_HISI) += pcie-hisi.o
 obj-$(CONFIG_PCIE_QCOM) += pcie-qcom.o
 obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o
 obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o
+obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
diff --git a/drivers/pci/host/pcie-armada8k.c b/drivers/pci/host/pcie-armada8k.c
new file mode 100644
index 0000000..7302de2
--- /dev/null
+++ b/drivers/pci/host/pcie-armada8k.c
@@ -0,0 +1,276 @@
+/*
+ * PCIe host controller driver for Marvell Armada-8K SoCs
+ *
+ * Armada-8K PCIe Glue Layer Source Code
+ *
+ * Copyright (C) 2016 Marvell Technology Group Ltd.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#define pr_fmt(fmt) "armada-8k-pcie: " fmt
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+
+#include "pcie-designware.h"
+
+struct armada8k_pcie {
+	void __iomem *base;
+	struct clk *clk;
+	struct pcie_port pp;
+};
+
+#define PCIE_VENDOR_REGS_OFFSET		0x8000
+
+#define PCIE_GLOBAL_CONTROL_REG		0x0
+#define PCIE_APP_LTSSM_EN		BIT(2)
+#define PCIE_DEVICE_TYPE_SHIFT		4
+#define PCIE_DEVICE_TYPE_MASK		0xF
+#define PCIE_DEVICE_TYPE_EP		0x0 /* Endpoint */
+#define PCIE_DEVICE_TYPE_LEP		0x1 /* Legacy endpoint */
+#define PCIE_DEVICE_TYPE_RC		0x4 /* Root complex */
+
+#define PCIE_GLOBAL_STATUS_REG		0x8
+#define PCIE_GLB_STS_RDLH_LINK_UP	BIT(1)
+#define PCIE_GLB_STS_PHY_LINK_UP	BIT(9)
+
+#define PCIE_GLOBAL_INT_CAUSE1_REG	0x1C
+#define PCIE_GLOBAL_INT_MASK1_REG	0x20
+#define PCIE_INT_A_ASSERT_MASK		BIT(9)
+#define PCIE_INT_B_ASSERT_MASK		BIT(10)
+#define PCIE_INT_C_ASSERT_MASK		BIT(11)
+#define PCIE_INT_D_ASSERT_MASK		BIT(12)
+
+#define PCIE_ARCACHE_TRC_REG		0x50
+#define PCIE_AWCACHE_TRC_REG		0x54
+#define PCIE_ARUSER_REG			0x5C
+#define PCIE_AWUSER_REG			0x60
+/*
+ * AR/AW Cache defauls: Normal memory, Write-Back, Read / Write
+ * allocate
+ */
+#define ARCACHE_DEFAULT_VALUE		0x3511
+#define AWCACHE_DEFAULT_VALUE		0x5311
+
+#define DOMAIN_OUTER_SHAREABLE		0x2
+#define AX_USER_DOMAIN_MASK		0x3
+#define AX_USER_DOMAIN_SHIFT		4
+
+
+
+#define to_armada8k_pcie(x)	container_of(x, struct armada8k_pcie, pp)
+
+static int armada8k_pcie_link_up(struct pcie_port *pp)
+{
+	u32 reg;
+	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
+	u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
+
+	reg = readl(pcie->base + PCIE_GLOBAL_STATUS_REG);
+
+	if ((reg & mask) == mask)
+		return 1;
+
+	pr_debug("No link detected (Global-Status: 0x%08x).\n", reg);
+	return 0;
+}
+
+static void armada8k_pcie_establish_link(struct pcie_port *pp)
+{
+	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
+	void __iomem *base = pcie->base;
+	int timeout = 1000;
+	u32 reg;
+
+	if (!armada8k_pcie_link_up(pp)) {
+		/* Disable LTSSM state machine to enable configuration */
+		reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
+		reg &= ~(PCIE_APP_LTSSM_EN);
+		writel(reg, base + PCIE_GLOBAL_CONTROL_REG);
+	}
+
+	/* Set the device to root complex mode */
+	reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
+	reg &= ~(PCIE_DEVICE_TYPE_MASK << PCIE_DEVICE_TYPE_SHIFT);
+	reg |= PCIE_DEVICE_TYPE_RC << PCIE_DEVICE_TYPE_SHIFT;
+	writel(reg, base + PCIE_GLOBAL_CONTROL_REG);
+
+	/* Set the PCIe master AxCache attributes */
+	writel(ARCACHE_DEFAULT_VALUE, base + PCIE_ARCACHE_TRC_REG);
+	writel(AWCACHE_DEFAULT_VALUE, base + PCIE_AWCACHE_TRC_REG);
+
+	/* Set the PCIe master AxDomain attributes */
+	reg = readl(base + PCIE_ARUSER_REG);
+	reg &= ~(AX_USER_DOMAIN_MASK << AX_USER_DOMAIN_SHIFT);
+	reg |= DOMAIN_OUTER_SHAREABLE << AX_USER_DOMAIN_SHIFT;
+	writel(reg, base + PCIE_ARUSER_REG);
+
+	reg = readl(base + PCIE_AWUSER_REG);
+	reg &= ~(AX_USER_DOMAIN_MASK << AX_USER_DOMAIN_SHIFT);
+	reg |= DOMAIN_OUTER_SHAREABLE << AX_USER_DOMAIN_SHIFT;
+	writel(reg, base + PCIE_AWUSER_REG);
+
+	/* Enable INT A-D interrupts */
+	reg = readl(base + PCIE_GLOBAL_INT_MASK1_REG);
+	reg |= PCIE_INT_A_ASSERT_MASK | PCIE_INT_B_ASSERT_MASK |
+	       PCIE_INT_C_ASSERT_MASK | PCIE_INT_D_ASSERT_MASK;
+	writel(reg, base + PCIE_GLOBAL_INT_MASK1_REG);
+
+	if (!armada8k_pcie_link_up(pp)) {
+		/* Configuration done. Start LTSSM */
+		reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
+		reg |= PCIE_APP_LTSSM_EN;
+		writel(reg, base + PCIE_GLOBAL_CONTROL_REG);
+	}
+
+	/* Wait until the link becomes active again */
+	while (timeout) {
+		if (armada8k_pcie_link_up(pp))
+			break;
+		msleep(1);
+		timeout--;
+	}
+
+	if (timeout == 0)
+		dev_err(pp->dev, "Link not up after reconfiguration\n");
+}
+
+static void armada8k_pcie_host_init(struct pcie_port *pp)
+{
+	dw_pcie_setup_rc(pp);
+	armada8k_pcie_establish_link(pp);
+}
+
+static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
+{
+	struct pcie_port *pp = arg;
+	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
+	void __iomem *base = pcie->base;
+	u32 val;
+
+	/*
+	 * Interrupts are directly handled by the device driver of the
+	 * PCI device. However, there are also latched into the PCIe
+	 * controller, so we simply discard them.
+	 */
+	val = readl(base + PCIE_GLOBAL_INT_CAUSE1_REG);
+	writel(val, base + PCIE_GLOBAL_INT_CAUSE1_REG);
+
+	return IRQ_HANDLED;
+}
+
+static struct pcie_host_ops armada8k_pcie_host_ops = {
+	.link_up = armada8k_pcie_link_up,
+	.host_init = armada8k_pcie_host_init,
+};
+
+static int armada8k_add_pcie_port(struct pcie_port *pp,
+				  struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	pp->root_bus_nr = -1;
+	pp->ops = &armada8k_pcie_host_ops;
+
+	pp->irq = platform_get_irq(pdev, 0);
+	if (!pp->irq) {
+		dev_err(dev, "failed to get irq for port\n");
+		return -ENODEV;
+	}
+
+	ret = devm_request_irq(dev, pp->irq, armada8k_pcie_irq_handler,
+			       IRQF_SHARED, "armada8k-pcie", pp);
+	if (ret) {
+		dev_err(dev, "failed to request irq %d\n", pp->irq);
+		return ret;
+	}
+
+	ret = dw_pcie_host_init(pp);
+	if (ret) {
+		dev_err(dev, "failed to initialize host: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int armada8k_pcie_probe(struct platform_device *pdev)
+{
+	struct armada8k_pcie *pcie;
+	struct pcie_port *pp;
+	struct device *dev = &pdev->dev;
+	struct resource *base;
+	int ret;
+
+	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(pcie->clk))
+		return PTR_ERR(pcie->clk);
+
+	clk_prepare_enable(pcie->clk);
+
+	pp = &pcie->pp;
+	pp->dev = dev;
+	platform_set_drvdata(pdev, pcie);
+
+	/* Get the dw-pcie unit configuration/control registers base. */
+	base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
+	pp->dbi_base = devm_ioremap_resource(dev, base);
+	if (IS_ERR(pp->dbi_base)) {
+		dev_err(dev, "couldn't remap regs base %p\n", base);
+		ret = PTR_ERR(pp->dbi_base);
+		goto fail;
+	}
+
+	pcie->base = pp->dbi_base + PCIE_VENDOR_REGS_OFFSET;
+
+	ret = armada8k_add_pcie_port(pp, pdev);
+	if (ret)
+		goto fail;
+
+	return 0;
+
+fail:
+	if (!IS_ERR(pcie->clk))
+		clk_disable_unprepare(pcie->clk);
+
+	return ret;
+}
+
+static const struct of_device_id armada8k_pcie_of_match[] = {
+	{ .compatible = "marvell,armada8k-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, armada8k_pcie_of_match);
+
+static struct platform_driver armada8k_pcie_driver = {
+	.probe		= armada8k_pcie_probe,
+	.driver = {
+		.name	= "armada8k-pcie",
+		.of_match_table = of_match_ptr(armada8k_pcie_of_match),
+	},
+};
+
+module_platform_driver(armada8k_pcie_driver);
+
+MODULE_DESCRIPTION("Armada 8k PCIe host controller driver");
+MODULE_AUTHOR("Yehuda Yitshak <yehuday@marvell.com>");
+MODULE_AUTHOR("Shadi Ammouri <shadi@marvell.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.6.4

[PATCH v3 0/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

[Bjorn Helgaas]

On Tue, Apr 26, 2016 at 10:31:44AM +0200, Thomas Petazzoni wrote:
> Hello,
> 
> Here is the third iteration of the PCIe host controller driver needed
> for the ARM64 Marvell Armada 7K/8K platform.
> 
> Changes since v2:
> 
>  - Added Rob Herring's Acked-by on the Device Tree binding patch.
> 
>  - Reworked the PCIe host driver following the suggestion of Bjorn
>    Helgaas: creation of armada8k_add_pcie_port() and
>    armada8k_pcie_establish_link() in order to follow the convention of
>    other Designware based drivers.
> 
> Thanks!
> 
> Thomas
> 
> Thomas Petazzoni (2):
>   dt-bindings: pci: add DT binding for Marvell Armada 7K/8K PCIe
>     controller
>   pci: host: new driver for Marvell Armada 7K/8K PCIe controller
> 
>  .../devicetree/bindings/pci/pci-armada8k.txt       |  38 +++
>  drivers/pci/host/Kconfig                           |  11 +
>  drivers/pci/host/Makefile                          |   1 +
>  drivers/pci/host/pcie-armada8k.c                   | 276 +++++++++++++++++++++
>  4 files changed, 326 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
>  create mode 100644 drivers/pci/host/pcie-armada8k.c

Thanks, Thomas, I applied these to pci/host-armada for v4.7.

I added the tweaks below to use dev_dbg() instead of pr_debug(), use
dw_pcie_wait_for_link() instead of another hand-coded timeout loop,
and fix a typo and remove unused constants.

Bjorn


diff --git a/drivers/pci/host/pcie-armada8k.c b/drivers/pci/host/pcie-armada8k.c
index 7302de2..811ddf8 100644
--- a/drivers/pci/host/pcie-armada8k.c
+++ b/drivers/pci/host/pcie-armada8k.c
@@ -10,8 +10,6 @@
  * warranty of any kind, whether express or implied.
  */
 
-#define pr_fmt(fmt) "armada-8k-pcie: " fmt
-
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
@@ -39,8 +37,6 @@ struct armada8k_pcie {
 #define PCIE_APP_LTSSM_EN		BIT(2)
 #define PCIE_DEVICE_TYPE_SHIFT		4
 #define PCIE_DEVICE_TYPE_MASK		0xF
-#define PCIE_DEVICE_TYPE_EP		0x0 /* Endpoint */
-#define PCIE_DEVICE_TYPE_LEP		0x1 /* Legacy endpoint */
 #define PCIE_DEVICE_TYPE_RC		0x4 /* Root complex */
 
 #define PCIE_GLOBAL_STATUS_REG		0x8
@@ -69,14 +65,12 @@ struct armada8k_pcie {
 #define AX_USER_DOMAIN_MASK		0x3
 #define AX_USER_DOMAIN_SHIFT		4
 
-
-
 #define to_armada8k_pcie(x)	container_of(x, struct armada8k_pcie, pp)
 
 static int armada8k_pcie_link_up(struct pcie_port *pp)
 {
-	u32 reg;
 	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
+	u32 reg;
 	u32 mask = PCIE_GLB_STS_RDLH_LINK_UP | PCIE_GLB_STS_PHY_LINK_UP;
 
 	reg = readl(pcie->base + PCIE_GLOBAL_STATUS_REG);
@@ -84,7 +78,7 @@ static int armada8k_pcie_link_up(struct pcie_port *pp)
 	if ((reg & mask) == mask)
 		return 1;
 
-	pr_debug("No link detected (Global-Status: 0x%08x).\n", reg);
+	dev_dbg(pp->dev, "No link detected (Global-Status: 0x%08x).\n", reg);
 	return 0;
 }
 
@@ -92,10 +86,9 @@ static void armada8k_pcie_establish_link(struct pcie_port *pp)
 {
 	struct armada8k_pcie *pcie = to_armada8k_pcie(pp);
 	void __iomem *base = pcie->base;
-	int timeout = 1000;
 	u32 reg;
 
-	if (!armada8k_pcie_link_up(pp)) {
+	if (!dw_pcie_link_up(pp)) {
 		/* Disable LTSSM state machine to enable configuration */
 		reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
 		reg &= ~(PCIE_APP_LTSSM_EN);
@@ -129,7 +122,7 @@ static void armada8k_pcie_establish_link(struct pcie_port *pp)
 	       PCIE_INT_C_ASSERT_MASK | PCIE_INT_D_ASSERT_MASK;
 	writel(reg, base + PCIE_GLOBAL_INT_MASK1_REG);
 
-	if (!armada8k_pcie_link_up(pp)) {
+	if (!dw_pcie_link_up(pp)) {
 		/* Configuration done. Start LTSSM */
 		reg = readl(base + PCIE_GLOBAL_CONTROL_REG);
 		reg |= PCIE_APP_LTSSM_EN;
@@ -137,14 +130,7 @@ static void armada8k_pcie_establish_link(struct pcie_port *pp)
 	}
 
 	/* Wait until the link becomes active again */
-	while (timeout) {
-		if (armada8k_pcie_link_up(pp))
-			break;
-		msleep(1);
-		timeout--;
-	}
-
-	if (timeout == 0)
+	if (dw_pcie_wait_for_link(pp))
 		dev_err(pp->dev, "Link not up after reconfiguration\n");
 }
 
@@ -163,7 +149,7 @@ static irqreturn_t armada8k_pcie_irq_handler(int irq, void *arg)
 
 	/*
 	 * Interrupts are directly handled by the device driver of the
-	 * PCI device. However, there are also latched into the PCIe
+	 * PCI device.  However, they are also latched into the PCIe
 	 * controller, so we simply discard them.
 	 */
 	val = readl(base + PCIE_GLOBAL_INT_CAUSE1_REG);

[PATCH v3 0/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

[Thomas Petazzoni]

Hello,

On Tue, 26 Apr 2016 12:31:44 -0500, Bjorn Helgaas wrote:

> >  create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
> >  create mode 100644 drivers/pci/host/pcie-armada8k.c
> 
> Thanks, Thomas, I applied these to pci/host-armada for v4.7.

Thanks!

> I added the tweaks below to use dev_dbg() instead of pr_debug(), use
> dw_pcie_wait_for_link() instead of another hand-coded timeout loop,
> and fix a typo and remove unused constants.

Looks all good, thanks for applying! Just one tiny question below.

>  	/*
>  	 * Interrupts are directly handled by the device driver of the
> -	 * PCI device. However, there are also latched into the PCIe
> +	 * PCI device.  However, they are also latched into the PCIe

Any reason to have two spaces after the dot here?

Thanks again!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[PATCH v3 0/2] pci: host: new driver for Marvell Armada 7K/8K PCIe controller

[Bjorn Helgaas]

On Tue, Apr 26, 2016 at 09:08:50PM +0200, Thomas Petazzoni wrote:
> Hello,
> 
> On Tue, 26 Apr 2016 12:31:44 -0500, Bjorn Helgaas wrote:
> 
> > >  create mode 100644 Documentation/devicetree/bindings/pci/pci-armada8k.txt
> > >  create mode 100644 drivers/pci/host/pcie-armada8k.c
> > 
> > Thanks, Thomas, I applied these to pci/host-armada for v4.7.
> 
> Thanks!
> 
> > I added the tweaks below to use dev_dbg() instead of pr_debug(), use
> > dw_pcie_wait_for_link() instead of another hand-coded timeout loop,
> > and fix a typo and remove unused constants.
> 
> Looks all good, thanks for applying! Just one tiny question below.
> 
> >  	/*
> >  	 * Interrupts are directly handled by the device driver of the
> > -	 * PCI device. However, there are also latched into the PCIe
> > +	 * PCI device.  However, they are also latched into the PCIe
> 
> Any reason to have two spaces after the dot here?

Only habit because my eighth-grade typing teacher in 1979 did it that
way, and (I think) vim does it that way by default.  Poor reasons,
both, and definitely trumped by consistency with the rest of the file,
which does use a single space in both other instances.  I removed the
extra space :)

Bjorn