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PCI: armada8k: Add support for gpio controlled reset signal 

Add support for the gpio reset signal binding as described in the
designware-pcie.txt DT binding document. Both the documented
'reset-gpio' property name and the more standard 'reset-gpios' name are
supported.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Baruch Siach 2018-10-03 15:49:43 +03:00 committed by Lorenzo Pieralisi
parent a3ed144652
commit 3d71746c42
1 changed files with 16 additions and 0 deletions
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16
drivers/pci/controller/dwc/pcie-armada8k.c
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@ -22,6 +22,7 @@
#include <linux/resource.h>
#include <linux/of_pci.h>
#include <linux/of_irq.h>
#include <linux/gpio/consumer.h>
#include "pcie-designware.h"
@ -29,6 +30,7 @@ struct armada8k_pcie {
struct dw_pcie *pci;
struct clk *clk;
struct clk *clk_reg;
struct gpio_desc *reset_gpio;
};
#define PCIE_VENDOR_REGS_OFFSET 0x8000
@ -137,6 +139,12 @@ static int armada8k_pcie_host_init(struct pcie_port *pp)
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct armada8k_pcie *pcie = to_armada8k_pcie(pci);
if (pcie->reset_gpio) {
/* assert and then deassert the reset signal */
gpiod_set_value_cansleep(pcie->reset_gpio, 1);
msleep(100);
gpiod_set_value_cansleep(pcie->reset_gpio, 0);
}
dw_pcie_setup_rc(pp);
armada8k_pcie_establish_link(pcie);
@ -249,6 +257,14 @@ static int armada8k_pcie_probe(struct platform_device *pdev)
goto fail_clkreg;
}
/* Get reset gpio signal and hold asserted (logically high) */
pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(pcie->reset_gpio)) {
ret = PTR_ERR(pcie->reset_gpio);
goto fail_clkreg;
}
platform_set_drvdata(pdev, pcie);
ret = armada8k_add_pcie_port(pcie, pdev);