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100 lines
2.7 KiB
Diff
100 lines
2.7 KiB
Diff
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From acd19633751f14607ccd76f9dfde5bde7935766c 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 29/31] usb: host: fotg2: add silicon clock handling
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When used in a system with software-controller 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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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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---
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drivers/usb/host/fotg210-hcd.c | 26 ++++++++++++++++++++++----
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drivers/usb/host/fotg210.h | 3 +++
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2 files changed, 25 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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@@ -45,6 +45,7 @@
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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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@@ -5635,7 +5636,7 @@ 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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@@ -5645,22 +5646,35 @@ 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_dis_clk;
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+ }
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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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@@ -5676,6 +5690,10 @@ 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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