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129 lines
3.8 KiB
Diff
129 lines
3.8 KiB
Diff
From 5f0c864c1f207dba1db587747a58ec6b362dadf8 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Sun, 29 Nov 2015 18:44:14 +0100
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Subject: [PATCH] ohci-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: Hans de Goede <hdegoede@redhat.com>
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---
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Changes in v2:
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-New patch in v2 of this patch-set, to complement the identical patch for
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the ehci-platform code
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---
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Documentation/devicetree/bindings/usb/usb-ohci.txt | 2 +-
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drivers/usb/host/ohci-platform.c | 49 +++++++++++++---------
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2 files changed, 30 insertions(+), 21 deletions(-)
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--- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
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+++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
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@@ -14,7 +14,7 @@ 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:
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--- a/drivers/usb/host/ohci-platform.c
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+++ b/drivers/usb/host/ohci-platform.c
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@@ -33,11 +33,12 @@
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#define DRIVER_DESC "OHCI generic platform driver"
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#define OHCI_MAX_CLKS 3
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+#define OHCI_MAX_RESETS 2
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#define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
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struct ohci_platform_priv {
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struct clk *clks[OHCI_MAX_CLKS];
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- struct reset_control *rst;
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+ struct reset_control *resets[OHCI_MAX_RESETS];
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struct phy **phys;
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int num_phys;
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};
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@@ -117,7 +118,7 @@ static int ohci_platform_probe(struct pl
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struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct ohci_platform_priv *priv;
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struct ohci_hcd *ohci;
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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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@@ -195,19 +196,23 @@ static int ohci_platform_probe(struct pl
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break;
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}
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}
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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 < OHCI_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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@@ -265,8 +270,10 @@ err_power:
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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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@@ -284,15 +291,17 @@ static int ohci_platform_remove(struct p
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct ohci_platform_priv *priv = hcd_to_ohci_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 < OHCI_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 < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
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clk_put(priv->clks[clk]);
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