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usb: dwc3: Cache ref_clk pointer in struct dwc3

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Cache ref_clk clock pointer in struct dwc3 . This is a preparatory
patch for subsequent backports from Linux kernel which configure
GFLADJ register content based on the ref_clk rate and therefore need
access to the ref_clk pointer.

It is possible to extract the clock pointer from existing clk_bulk
list of already claimed clock, no need to call clk_get*() again.

Reviewed-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2022-11-27 15:31:52 +01:00
parent 55a95f8f58
commit 8ae84e6453
2 changed files with 12 additions and 0 deletions
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3
drivers/usb/dwc3/core.h
View file

@ -668,6 +668,7 @@ struct dwc3_scratchpad_array {
* @event_buffer_list: a list of event buffers
* @gadget: device side representation of the peripheral controller
* @gadget_driver: pointer to the gadget driver
* @ref_clk: reference clock
* @regs: base address for our registers
* @regs_size: address space size
* @nr_scratch: number of scratch buffers
@ -766,6 +767,8 @@ struct dwc3 {
struct usb_gadget gadget;
struct usb_gadget_driver *gadget_driver;
struct clk *ref_clk;
void __iomem *regs;
size_t regs_size;

9
drivers/usb/dwc3/dwc3-generic.c
View file

@ -59,12 +59,21 @@ static int dwc3_generic_probe(struct udevice *dev,
struct dwc3_generic_plat *plat = dev_get_plat(dev);
struct dwc3 *dwc3 = &priv->dwc3;
struct dwc3_glue_data *glue = dev_get_plat(dev->parent);
int __maybe_unused index;
ofnode __maybe_unused node;
dwc3->dev = dev;
dwc3->maximum_speed = plat->maximum_speed;
dwc3->dr_mode = plat->dr_mode;
#if CONFIG_IS_ENABLED(OF_CONTROL)
dwc3_of_parse(dwc3);
node = dev_ofnode(dev->parent);
index = ofnode_stringlist_search(node, "clock-names", "ref");
if (index < 0)
index = ofnode_stringlist_search(node, "clock-names", "ref_clk");
if (index >= 0)
dwc3->ref_clk = &glue->clks.clks[index];
#endif
/*