Re: [PATCH v4 1/3] phy: rockchip: inno-usb2: convert clock management to bulk

[Frank Wang]

Hi Krzysztof,
On 2024/9/30 3:38, Krzysztof Kozlowski wrote:
> On Sun, Sep 29, 2024 at 02:10:23PM +0800, Frank Wang wrote:
> > From: Frank Wang <frank.wang@xxxxxxxxxxxxxx>
> >
> > Since some Rockchip SoCs (e.g RK3576) have more than one clock,
> > this converts the clock management from single to bulk method to
> > make the driver more flexible.
> >
> > Signed-off-by: Frank Wang <frank.wang@xxxxxxxxxxxxxx>
> > ---
> > Changelog:
> > v4:
> >   - a new patch split from the [PATCH v3 2/2], suggestions from Heiko.
> >
> > v1-v3:
> >   - none
> >
> >   drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 43 ++++++++++++++++---
> >   1 file changed, 36 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> > index 4f71373ae6e1..ad3e65dc6aa4 100644
> > --- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> > +++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
> > @@ -229,9 +229,10 @@ struct rockchip_usb2phy_port {
> >    * @dev: pointer to device.
> >    * @grf: General Register Files regmap.
> >    * @usbgrf: USB General Register Files regmap.
> > - * @clk: clock struct of phy input clk.
> > + * @clks: array of phy input clocks.
> >    * @clk480m: clock struct of phy output clk.
> >    * @clk480m_hw: clock struct of phy output clk management.
> > + * @num_clks: number of phy input clocks.
> >    * @phy_reset: phy reset control.
> >    * @chg_state: states involved in USB charger detection.
> >    * @chg_type: USB charger types.
> > @@ -246,9 +247,10 @@ struct rockchip_usb2phy {
> >   	struct device	*dev;
> >   	struct regmap	*grf;
> >   	struct regmap	*usbgrf;
> > -	struct clk	*clk;
> > +	struct clk_bulk_data	*clks;
> >   	struct clk	*clk480m;
> >   	struct clk_hw	clk480m_hw;
> > +	int			num_clks;
> >   	struct reset_control	*phy_reset;
> >   	enum usb_chg_state	chg_state;
> >   	enum power_supply_type	chg_type;
> > @@ -310,6 +312,13 @@ static int rockchip_usb2phy_reset(struct rockchip_usb2phy *rphy)
> >   	return 0;
> >   }
> >   
> > +static void rockchip_usb2phy_clk_bulk_disable(void *data)
> > +{
> > +	struct rockchip_usb2phy *rphy = data;
> > +
> > +	clk_bulk_disable_unprepare(rphy->num_clks, rphy->clks);
> > +}
> > +
> >   static int rockchip_usb2phy_clk480m_prepare(struct clk_hw *hw)
> >   {
> >   	struct rockchip_usb2phy *rphy =
> > @@ -376,7 +385,9 @@ rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
> >   {
> >   	struct device_node *node = rphy->dev->of_node;
> >   	struct clk_init_data init;
> > +	struct clk *refclk = NULL;
> >   	const char *clk_name;
> > +	int i;
> >   	int ret = 0;
> >   
> >   	init.flags = 0;
> > @@ -386,8 +397,15 @@ rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
> >   	/* optional override of the clockname */
> >   	of_property_read_string(node, "clock-output-names", &init.name);
> >   
> > -	if (rphy->clk) {
> > -		clk_name = __clk_get_name(rphy->clk);
> > +	for (i = 0; i < rphy->num_clks; i++) {
> > +		if (!strncmp(rphy->clks[i].id, "phyclk", 6)) {
> > +			refclk = rphy->clks[i].clk;
> > +			break;
> > +		}
> > +	}
> > +
> > +	if (!IS_ERR(refclk)) {
> > +		clk_name = __clk_get_name(refclk);
> >   		init.parent_names = &clk_name;
> >   		init.num_parents = 1;
> >   	} else {
> > @@ -1406,18 +1424,29 @@ static int rockchip_usb2phy_probe(struct platform_device *pdev)
> >   	if (IS_ERR(rphy->phy_reset))
> >   		return PTR_ERR(rphy->phy_reset);
> >   
> > -	rphy->clk = devm_clk_get_optional_enabled(dev, "phyclk");
> > -	if (IS_ERR(rphy->clk)) {
> > -		return dev_err_probe(&pdev->dev, PTR_ERR(rphy->clk),
> > +	ret = devm_clk_bulk_get_all(dev, &rphy->clks);
> > +	if (ret == -EPROBE_DEFER) {
> This does not make much sense. Why would you proceed on other critical
> errors?
>
> You want to use optional variant, I guess?

Yes, the clock properties are optional.


Best regards,
Frank

> Best regards,
> Krzysztof