131 lines
4.2 KiB
Diff
131 lines
4.2 KiB
Diff
From 957e8f96c67052ca843ea9ffc5223662b973e5de Mon Sep 17 00:00:00 2001
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From: Reinder de Haan <patchesrdh@mveas.com>
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Date: Sun, 15 Nov 2015 14:24:46 +0100
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Subject: [PATCH] ehci-platform: Add support for controllers with multiple
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reset lines
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At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
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reset lines, the controller will not initialize while the reset for
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its companion is still asserted, which means we need to de-assert
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2 resets for the controller to work.
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Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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Changes in v2:
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-Use the new reset_control_[de]assert_shared reset-controller functions
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---
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Documentation/devicetree/bindings/usb/usb-ehci.txt | 2 +-
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drivers/usb/host/ehci-platform.c | 47 +++++++++++++---------
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2 files changed, 30 insertions(+), 19 deletions(-)
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diff --git a/Documentation/devicetree/bindings/usb/usb-ehci.txt b/Documentation/devicetree/bindings/usb/usb-ehci.txt
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index a12d601..0701812 100644
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--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
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+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
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@@ -18,7 +18,7 @@ Optional properties:
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- clocks : a list of phandle + clock specifier pairs
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- phys : phandle + phy specifier pair
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- phy-names : "usb"
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- - resets : phandle + reset specifier pair
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+ - resets : a list of phandle + reset specifier pairs
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Example (Sequoia 440EPx):
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ehci@e0000300 {
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diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
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index bd7082f2..6fbf32a 100644
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--- a/drivers/usb/host/ehci-platform.c
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+++ b/drivers/usb/host/ehci-platform.c
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@@ -39,11 +39,12 @@
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#define DRIVER_DESC "EHCI generic platform driver"
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#define EHCI_MAX_CLKS 3
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+#define EHCI_MAX_RESETS 2
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#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
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struct ehci_platform_priv {
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struct clk *clks[EHCI_MAX_CLKS];
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- struct reset_control *rst;
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+ struct reset_control *resets[EHCI_MAX_RESETS];
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struct phy **phys;
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int num_phys;
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bool reset_on_resume;
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@@ -149,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
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struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct ehci_platform_priv *priv;
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struct ehci_hcd *ehci;
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- int err, irq, phy_num, clk = 0;
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+ int err, irq, phy_num, clk = 0, rst = 0;
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if (usb_disabled())
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return -ENODEV;
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@@ -232,18 +233,24 @@ static int ehci_platform_probe(struct platform_device *dev)
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break;
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}
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}
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- }
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- priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
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- if (IS_ERR(priv->rst)) {
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- err = PTR_ERR(priv->rst);
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- if (err == -EPROBE_DEFER)
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- goto err_put_clks;
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- priv->rst = NULL;
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- } else {
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- err = reset_control_deassert(priv->rst);
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- if (err)
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- goto err_put_clks;
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+ for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
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+ priv->resets[rst] =
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+ of_reset_control_get_by_index(dev->dev.of_node,
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+ rst);
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+ if (IS_ERR(priv->resets[rst])) {
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+ err = PTR_ERR(priv->resets[rst]);
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+ if (err == -EPROBE_DEFER)
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+ goto err_reset;
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+ priv->resets[rst] = NULL;
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+ break;
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+ }
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+ err = reset_control_deassert_shared(priv->resets[rst]);
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+ if (err) {
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+ reset_control_put(priv->resets[rst]);
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+ goto err_reset;
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+ }
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+ }
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}
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if (pdata->big_endian_desc)
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@@ -300,8 +307,10 @@ static int ehci_platform_probe(struct platform_device *dev)
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if (pdata->power_off)
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pdata->power_off(dev);
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err_reset:
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- if (priv->rst)
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- reset_control_assert(priv->rst);
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+ while (--rst >= 0) {
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+ reset_control_assert_shared(priv->resets[rst]);
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+ reset_control_put(priv->resets[rst]);
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+ }
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err_put_clks:
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while (--clk >= 0)
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clk_put(priv->clks[clk]);
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@@ -319,15 +328,17 @@ static int ehci_platform_remove(struct platform_device *dev)
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
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- int clk;
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+ int clk, rst;
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usb_remove_hcd(hcd);
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if (pdata->power_off)
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pdata->power_off(dev);
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- if (priv->rst)
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- reset_control_assert(priv->rst);
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+ for (rst = 0; rst < EHCI_MAX_RESETS && priv->resets[rst]; rst++) {
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+ reset_control_assert_shared(priv->resets[rst]);
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+ reset_control_put(priv->resets[rst]);
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+ }
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for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
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clk_put(priv->clks[clk]);
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