mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
128 lines
3.9 KiB
Diff
128 lines
3.9 KiB
Diff
From 957e8f96c67052ca843ea9ffc5223662b973e5de Mon Sep 17 00:00:00 2001
|
|
From: Reinder de Haan <patchesrdh@mveas.com>
|
|
Date: Sun, 15 Nov 2015 14:24:46 +0100
|
|
Subject: [PATCH] ehci-platform: Add support for controllers with multiple
|
|
reset lines
|
|
|
|
At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
|
|
reset lines, the controller will not initialize while the reset for
|
|
its companion is still asserted, which means we need to de-assert
|
|
2 resets for the controller to work.
|
|
|
|
Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
|
|
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
|
|
---
|
|
Changes in v2:
|
|
-Use the new reset_control_[de]assert_shared reset-controller functions
|
|
---
|
|
Documentation/devicetree/bindings/usb/usb-ehci.txt | 2 +-
|
|
drivers/usb/host/ehci-platform.c | 47 +++++++++++++---------
|
|
2 files changed, 30 insertions(+), 19 deletions(-)
|
|
|
|
--- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
|
|
+++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
|
|
@@ -18,7 +18,7 @@ Optional properties:
|
|
- clocks : a list of phandle + clock specifier pairs
|
|
- phys : phandle + phy specifier pair
|
|
- phy-names : "usb"
|
|
- - resets : phandle + reset specifier pair
|
|
+ - resets : a list of phandle + reset specifier pairs
|
|
|
|
Example (Sequoia 440EPx):
|
|
ehci@e0000300 {
|
|
--- a/drivers/usb/host/ehci-platform.c
|
|
+++ b/drivers/usb/host/ehci-platform.c
|
|
@@ -39,11 +39,12 @@
|
|
|
|
#define DRIVER_DESC "EHCI generic platform driver"
|
|
#define EHCI_MAX_CLKS 3
|
|
+#define EHCI_MAX_RESETS 2
|
|
#define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
|
|
|
|
struct ehci_platform_priv {
|
|
struct clk *clks[EHCI_MAX_CLKS];
|
|
- struct reset_control *rst;
|
|
+ struct reset_control *resets[EHCI_MAX_RESETS];
|
|
struct phy **phys;
|
|
int num_phys;
|
|
bool reset_on_resume;
|
|
@@ -149,7 +150,7 @@ static int ehci_platform_probe(struct pl
|
|
struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
|
|
struct ehci_platform_priv *priv;
|
|
struct ehci_hcd *ehci;
|
|
- int err, irq, phy_num, clk = 0;
|
|
+ int err, irq, phy_num, clk = 0, rst = 0;
|
|
|
|
if (usb_disabled())
|
|
return -ENODEV;
|
|
@@ -232,18 +233,24 @@ static int ehci_platform_probe(struct pl
|
|
break;
|
|
}
|
|
}
|
|
- }
|
|
|
|
- priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
|
|
- if (IS_ERR(priv->rst)) {
|
|
- err = PTR_ERR(priv->rst);
|
|
- if (err == -EPROBE_DEFER)
|
|
- goto err_put_clks;
|
|
- priv->rst = NULL;
|
|
- } else {
|
|
- err = reset_control_deassert(priv->rst);
|
|
- if (err)
|
|
- goto err_put_clks;
|
|
+ for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
|
|
+ priv->resets[rst] =
|
|
+ of_reset_control_get_by_index(dev->dev.of_node,
|
|
+ rst);
|
|
+ if (IS_ERR(priv->resets[rst])) {
|
|
+ err = PTR_ERR(priv->resets[rst]);
|
|
+ if (err == -EPROBE_DEFER)
|
|
+ goto err_reset;
|
|
+ priv->resets[rst] = NULL;
|
|
+ break;
|
|
+ }
|
|
+ err = reset_control_deassert_shared(priv->resets[rst]);
|
|
+ if (err) {
|
|
+ reset_control_put(priv->resets[rst]);
|
|
+ goto err_reset;
|
|
+ }
|
|
+ }
|
|
}
|
|
|
|
if (pdata->big_endian_desc)
|
|
@@ -302,8 +309,10 @@ err_power:
|
|
if (pdata->power_off)
|
|
pdata->power_off(dev);
|
|
err_reset:
|
|
- if (priv->rst)
|
|
- reset_control_assert(priv->rst);
|
|
+ while (--rst >= 0) {
|
|
+ reset_control_assert_shared(priv->resets[rst]);
|
|
+ reset_control_put(priv->resets[rst]);
|
|
+ }
|
|
err_put_clks:
|
|
while (--clk >= 0)
|
|
clk_put(priv->clks[clk]);
|
|
@@ -321,15 +330,17 @@ static int ehci_platform_remove(struct p
|
|
struct usb_hcd *hcd = platform_get_drvdata(dev);
|
|
struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
|
|
struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
|
|
- int clk;
|
|
+ int clk, rst;
|
|
|
|
usb_remove_hcd(hcd);
|
|
|
|
if (pdata->power_off)
|
|
pdata->power_off(dev);
|
|
|
|
- if (priv->rst)
|
|
- reset_control_assert(priv->rst);
|
|
+ for (rst = 0; rst < EHCI_MAX_RESETS && priv->resets[rst]; rst++) {
|
|
+ reset_control_assert_shared(priv->resets[rst]);
|
|
+ reset_control_put(priv->resets[rst]);
|
|
+ }
|
|
|
|
for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
|
|
clk_put(priv->clks[clk]);
|