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91 lines
2.4 KiB
Diff
91 lines
2.4 KiB
Diff
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From 772ea3ec2b9363b45ef9a4768ea205f758c3debc Mon Sep 17 00:00:00 2001
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From: Linus Walleij <linus.walleij@linaro.org>
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Date: Mon, 14 Nov 2022 12:52:00 +0100
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Subject: [PATCH 10/29] fotg210-udc: Handle PCLK
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This adds optional handling of the peripheral clock PCLK.
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Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Link: https://lore.kernel.org/r/20221114115201.302887-3-linus.walleij@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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--- a/drivers/usb/fotg210/fotg210-udc.c
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+++ b/drivers/usb/fotg210/fotg210-udc.c
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@@ -15,6 +15,7 @@
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#include <linux/platform_device.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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+#include <linux/clk.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/phy.h>
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@@ -1145,6 +1146,10 @@ int fotg210_udc_remove(struct platform_d
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fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
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for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
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kfree(fotg210->ep[i]);
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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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+
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kfree(fotg210);
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return 0;
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@@ -1180,17 +1185,34 @@ int fotg210_udc_probe(struct platform_de
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fotg210->dev = dev;
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+ /* It's OK not to supply this clock */
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+ fotg210->pclk = devm_clk_get(dev, "PCLK");
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+ if (!IS_ERR(fotg210->pclk)) {
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+ ret = clk_prepare_enable(fotg210->pclk);
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+ if (ret) {
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+ dev_err(dev, "failed to enable PCLK\n");
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+ return ret;
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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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+ ret = -EPROBE_DEFER;
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+ goto err;
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+ }
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+
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fotg210->phy = devm_usb_get_phy_by_phandle(dev->parent, "usb-phy", 0);
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if (IS_ERR(fotg210->phy)) {
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ret = PTR_ERR(fotg210->phy);
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if (ret == -EPROBE_DEFER)
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- goto err;
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+ goto err_pclk;
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dev_info(dev, "no PHY found\n");
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fotg210->phy = NULL;
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} else {
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ret = usb_phy_init(fotg210->phy);
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if (ret)
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- goto err;
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+ goto err_pclk;
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dev_info(dev, "found and initialized PHY\n");
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}
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@@ -1292,6 +1314,10 @@ err_map:
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err_alloc:
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for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
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kfree(fotg210->ep[i]);
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+err_pclk:
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+ if (!IS_ERR(fotg210->pclk))
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+ clk_disable_unprepare(fotg210->pclk);
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+
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kfree(fotg210);
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err:
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--- a/drivers/usb/fotg210/fotg210-udc.h
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+++ b/drivers/usb/fotg210/fotg210-udc.h
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@@ -231,6 +231,7 @@ struct fotg210_ep {
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struct fotg210_udc {
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spinlock_t lock; /* protect the struct */
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void __iomem *reg;
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+ struct clk *pclk;
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unsigned long irq_trigger;
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