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usb: gadget: udc-xilinx: Add clock support

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Currently the driver depends on the  bootloader to enable the clocks.
Add support for clocking. The patch enables the clock at  probe and
disables them at remove.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Acked-by: Felipe Balbi <balbi@kernel.org>
Link: https://lore.kernel.org/r/054de6deeab81020eaf0399add2839c36b64275f.1632805672.git.shubhrajyoti.datta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2021-09-28 10:57:11 +05:30 committed by Greg Kroah-Hartman
parent 01b5415044
commit 2474922921
1 changed files with 25 additions and 0 deletions
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25
drivers/usb/gadget/udc/udc-xilinx.c
View file

@ -11,6 +11,7 @@
* USB peripheral controller (at91_udc.c).
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
@ -171,6 +172,7 @@ struct xusb_ep {
* @addr: the usb device base address
* @lock: instance of spinlock
* @dma_enabled: flag indicating whether the dma is included in the system
* @clk: pointer to struct clk
* @read_fn: function pointer to read device registers
* @write_fn: function pointer to write to device registers
*/
@ -188,6 +190,7 @@ struct xusb_udc {
void __iomem *addr;
spinlock_t lock;
bool dma_enabled;
struct clk *clk;
unsigned int (*read_fn)(void __iomem *);
void (*write_fn)(void __iomem *, u32, u32);
@ -2092,6 +2095,27 @@ static int xudc_probe(struct platform_device *pdev)
udc->gadget.ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO].ep_usb;
udc->gadget.name = driver_name;
udc->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
if (IS_ERR(udc->clk)) {
if (PTR_ERR(udc->clk) != -ENOENT) {
ret = PTR_ERR(udc->clk);
goto fail;
}
/*
* Clock framework support is optional, continue on,
* anyways if we don't find a matching clock
*/
dev_warn(&pdev->dev, "s_axi_aclk clock property is not found\n");
udc->clk = NULL;
}
ret = clk_prepare_enable(udc->clk);
if (ret) {
dev_err(&pdev->dev, "Unable to enable clock.\n");
return ret;
}
spin_lock_init(&udc->lock);
/* Check for IP endianness */
@ -2147,6 +2171,7 @@ static int xudc_remove(struct platform_device *pdev)
struct xusb_udc *udc = platform_get_drvdata(pdev);
usb_del_gadget_udc(&udc->gadget);
clk_disable_unprepare(udc->clk);
return 0;
}