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fotg210-udc: Handle PCLK

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This adds optional handling of the peripheral clock PCLK.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221114115201.302887-3-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij 2022-11-14 12:52:00 +01:00 committed by Greg Kroah-Hartman
parent 5f217ccd52
commit 718a38d092
2 changed files with 29 additions and 2 deletions
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30
drivers/usb/fotg210/fotg210-udc.c
View file

@ -15,6 +15,7 @@
#include <linux/platform_device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/clk.h>
#include <linux/usb/otg.h>
#include <linux/usb/phy.h>
@ -1132,6 +1133,10 @@ int fotg210_udc_remove(struct platform_device *pdev)
fotg210_ep_free_request(&fotg210->ep[0]->ep, fotg210->ep0_req);
for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
kfree(fotg210->ep[i]);
if (!IS_ERR(fotg210->pclk))
clk_disable_unprepare(fotg210->pclk);
kfree(fotg210);
return 0;
@ -1167,17 +1172,34 @@ int fotg210_udc_probe(struct platform_device *pdev)
fotg210->dev = dev;
/* It's OK not to supply this clock */
fotg210->pclk = devm_clk_get(dev, "PCLK");
if (!IS_ERR(fotg210->pclk)) {
ret = clk_prepare_enable(fotg210->pclk);
if (ret) {
dev_err(dev, "failed to enable PCLK\n");
return ret;
}
} else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
/*
* Percolate deferrals, for anything else,
* just live without the clocking.
*/
ret = -EPROBE_DEFER;
goto err;
}
fotg210->phy = devm_usb_get_phy_by_phandle(dev->parent, "usb-phy", 0);
if (IS_ERR(fotg210->phy)) {
ret = PTR_ERR(fotg210->phy);
if (ret == -EPROBE_DEFER)
goto err;
goto err_pclk;
dev_info(dev, "no PHY found\n");
fotg210->phy = NULL;
} else {
ret = usb_phy_init(fotg210->phy);
if (ret)
goto err;
goto err_pclk;
dev_info(dev, "found and initialized PHY\n");
}
@ -1277,6 +1299,10 @@ int fotg210_udc_probe(struct platform_device *pdev)
err_alloc:
for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
kfree(fotg210->ep[i]);
err_pclk:
if (!IS_ERR(fotg210->pclk))
clk_disable_unprepare(fotg210->pclk);
kfree(fotg210);
err:

1
drivers/usb/fotg210/fotg210-udc.h
View file

@ -231,6 +231,7 @@ struct fotg210_ep {
struct fotg210_udc {
spinlock_t lock; /* protect the struct */
void __iomem *reg;
struct clk *pclk;
unsigned long irq_trigger;