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117 lines
3.2 KiB
Diff
117 lines
3.2 KiB
Diff
From e76906e8e9dfaeeb22a37706aca493b86e4367bd Mon Sep 17 00:00:00 2001
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From: Linus Walleij <linus.walleij@linaro.org>
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Date: Fri, 21 Apr 2017 20:46:12 +0200
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Subject: [PATCH 13/18] usb: host: fotg2: add silicon clock handling
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When used in a system with software-controlled silicon clocks,
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the FOTG210 needs to grab, prepare and enable the clock.
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This is needed on for example the Cortina Gemini, where the
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platform will by default gate off the clock unless the
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peripheral (in this case the USB driver) grabs and enables
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the clock.
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If there is no clock available on the platform, we live
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without it. Make sure to percolate probe deferrals.
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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---
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ChangeLog v1->v2:
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- Handle probe deferrals on the clock controller, no matter
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how unlikely they are.
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- Send the patch to get Gemini USB rolling and try to get some
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stuff upstream, this patch should be fine on its own.
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---
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drivers/usb/host/fotg210-hcd.c | 33 +++++++++++++++++++++++++++++----
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drivers/usb/host/fotg210.h | 3 +++
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2 files changed, 32 insertions(+), 4 deletions(-)
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--- a/drivers/usb/host/fotg210-hcd.c
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+++ b/drivers/usb/host/fotg210-hcd.c
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@@ -31,6 +31,7 @@
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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+#include <linux/clk.h>
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#include <asm/byteorder.h>
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#include <asm/irq.h>
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@@ -5600,7 +5601,7 @@ static int fotg210_hcd_probe(struct plat
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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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retval = PTR_ERR(hcd->regs);
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- goto failed;
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+ goto failed_put_hcd;
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}
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hcd->rsrc_start = res->start;
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@@ -5610,22 +5611,42 @@ static int fotg210_hcd_probe(struct plat
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fotg210->caps = hcd->regs;
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+ /* It's OK not to supply this clock */
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+ fotg210->pclk = clk_get(dev, "PCLK");
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+ if (!IS_ERR(fotg210->pclk)) {
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+ retval = clk_prepare_enable(fotg210->pclk);
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+ if (retval) {
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+ dev_err(dev, "failed to enable PCLK\n");
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+ goto failed_put_hcd;
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+ }
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+ } else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
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+ /*
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+ * Percolate deferrals, for anything else,
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+ * just live without the clocking.
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+ */
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+ retval = PTR_ERR(fotg210->pclk);
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+ goto failed_dis_clk;
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+ }
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+
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retval = fotg210_setup(hcd);
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if (retval)
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- goto failed;
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+ goto failed_dis_clk;
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fotg210_init(fotg210);
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (retval) {
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dev_err(dev, "failed to add hcd with err %d\n", retval);
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- goto failed;
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+ goto failed_dis_clk;
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}
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device_wakeup_enable(hcd->self.controller);
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return retval;
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-failed:
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+failed_dis_clk:
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+ if (!IS_ERR(fotg210->pclk))
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+ clk_disable_unprepare(fotg210->pclk);
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+failed_put_hcd:
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usb_put_hcd(hcd);
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fail_create_hcd:
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dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
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@@ -5641,6 +5662,10 @@ static int fotg210_hcd_remove(struct pla
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{
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struct device *dev = &pdev->dev;
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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+ struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
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+
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+ if (!IS_ERR(fotg210->pclk))
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+ clk_disable_unprepare(fotg210->pclk);
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if (!hcd)
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return 0;
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--- a/drivers/usb/host/fotg210.h
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+++ b/drivers/usb/host/fotg210.h
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@@ -182,6 +182,9 @@ struct fotg210_hcd { /* one per contro
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# define COUNT(x)
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#endif
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+ /* silicon clock */
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+ struct clk *pclk;
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+
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/* debug files */
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struct dentry *debug_dir;
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};
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