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    Subject[PATCH v3 5/7] usb: dwc3: Add snps,ref-clock-frequency-hz property for ACPI
    Date
    This property allows setting the reference clock frequency properly for
    ACPI-based systems. It is not documented under dt-bindings, since it is
    not intended for use on DT-based systems. DT-based systems should use
    the clocks property instead.

    Frequency is preferred over period since it has greater precision when
    used in calculations.

    Signed-off-by: Sean Anderson <sean.anderson@seco.com>
    ---

    (no changes since v2)

    Changes in v2:
    - New

    drivers/usb/dwc3/core.c | 6 ++++--
    drivers/usb/dwc3/core.h | 4 +++-
    2 files changed, 7 insertions(+), 3 deletions(-)

    diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
    index 18adddfba3da..c1b045121672 100644
    --- a/drivers/usb/dwc3/core.c
    +++ b/drivers/usb/dwc3/core.c
    @@ -353,8 +353,8 @@ static void dwc3_ref_clk_period(struct dwc3 *dwc)
    unsigned long rate;
    u32 reg;

    - if (dwc->ref_clk) {
    - rate = clk_get_rate(dwc->ref_clk);
    + if (dwc->ref_clk || dwc->ref_clk_freq) {
    + rate = clk_get_rate(dwc->ref_clk) ?: dwc->ref_clk_freq;
    if (!rate)
    return;
    period = NSEC_PER_SEC / rate;
    @@ -1497,6 +1497,8 @@ static void dwc3_get_properties(struct dwc3 *dwc)
    &dwc->fladj);
    device_property_read_u32(dev, "snps,ref-clock-period-ns",
    &dwc->ref_clk_per);
    + device_property_read_u32(dev, "snps,ref-clock-frequency-hz",
    + &dwc->ref_clk_freq);

    dwc->dis_metastability_quirk = device_property_read_bool(dev,
    "snps,dis_metastability_quirk");
    diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
    index eb9c1efced05..00a792459fec 100644
    --- a/drivers/usb/dwc3/core.h
    +++ b/drivers/usb/dwc3/core.h
    @@ -988,7 +988,8 @@ struct dwc3_scratchpad_array {
    * @regs: base address for our registers
    * @regs_size: address space size
    * @fladj: frame length adjustment
    - * @ref_clk_per: reference clock period configuration
    + * @ref_clk_per: reference clock period; deprecated in favor of @ref_clk_freq
    + * @ref_clk_freq: reference clock frequency to use if @ref_clk is missing
    * @irq_gadget: peripheral controller's IRQ number
    * @otg_irq: IRQ number for OTG IRQs
    * @current_otg_role: current role of operation while using the OTG block
    @@ -1171,6 +1172,7 @@ struct dwc3 {

    u32 fladj;
    u32 ref_clk_per;
    + u32 ref_clk_freq;
    u32 irq_gadget;
    u32 otg_irq;
    u32 current_otg_role;
    --
    2.25.1
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