From: Xavier Drudis Ferran Date: Mon, 5 Jun 2023 15:06:57 +0000 (+0200) Subject: phy: rockchip-inno-usb2: Implement clock operations for usb2phy clock X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=40359c94405b103d25233d8d727d671748b751b9;p=u-boot.git phy: rockchip-inno-usb2: Implement clock operations for usb2phy clock This clock doesn't seem needed but appears in a phandle list used by ehci-generic.c to bulk enable it. The phandle list comes from linux, where it is needed for suspend/resume to work [1]. My tests give the same results with or without this patch, but Marek Vasut found it weird to declare an empty clk_ops [2]. So I adapted the code from linux 6.1-rc8 so that it hopefully works if it ever has some user. For now, without real use, it seems to at least not give any errors when called. Link: [1] https://lkml.kernel.org/lkml/1731551.Q6cHK6n5ZM@phil/T/ [2] https://patchwork.ozlabs.org/project/uboot/patch/Y5IWpjYLB4aXMy9o@localhost/ Cc: Simon Glass Cc: Philipp Tomsich Cc: Kever Yang Cc: Lukasz Majewski Cc: Sean Anderson Cc: Marek Vasut Cc: Christoph Fritz Cc: Jagan Teki Signed-off-by: Xavier Drudis Ferran Reviewed-by: Kever Yang Reviewed-by: Jagan Teki Tested-by: Jagan Teki # rk3399, rk3328, rv1126 --- diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c index 32145afac1..e43a5ba9b5 100644 --- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c +++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c @@ -56,6 +56,7 @@ struct rockchip_usb2phy_port_cfg { struct rockchip_usb2phy_cfg { unsigned int reg; + struct usb2phy_reg clkout_ctl; const struct rockchip_usb2phy_port_cfg port_cfgs[USB2PHY_NUM_PORTS]; }; @@ -77,6 +78,18 @@ static inline int property_enable(void *reg_base, return writel(val, reg_base + reg->offset); } +static inline bool property_enabled(void *reg_base, + const struct usb2phy_reg *reg) +{ + unsigned int tmp, orig; + unsigned int mask = GENMASK(reg->bitend, reg->bitstart); + + orig = readl(reg_base + reg->offset); + + tmp = (orig & mask) >> reg->bitstart; + return tmp != reg->disable; +} + static const struct rockchip_usb2phy_port_cfg *us2phy_get_port(struct phy *phy) { @@ -169,7 +182,63 @@ static struct phy_ops rockchip_usb2phy_ops = { .of_xlate = rockchip_usb2phy_of_xlate, }; +/** + * round_rate() - Adjust a rate to the exact rate a clock can provide. + * @clk: The clock to manipulate. + * @rate: Desidered clock rate in Hz. + * + * Return: rounded rate in Hz, or -ve error code. + */ +ulong rockchip_usb2phy_clk_round_rate(struct clk *clk, ulong rate) +{ + return 480000000; +} + +/** + * enable() - Enable a clock. + * @clk: The clock to manipulate. + * + * Return: zero on success, or -ve error code. + */ +int rockchip_usb2phy_clk_enable(struct clk *clk) +{ + struct udevice *parent = dev_get_parent(clk->dev); + struct rockchip_usb2phy *priv = dev_get_priv(parent); + const struct rockchip_usb2phy_cfg *phy_cfg = priv->phy_cfg; + + /* turn on 480m clk output if it is off */ + if (!property_enabled(priv->reg_base, &phy_cfg->clkout_ctl)) { + property_enable(priv->reg_base, &phy_cfg->clkout_ctl, true); + + /* waiting for the clk become stable */ + usleep_range(1200, 1300); + } + + return 0; +} + +/** + * disable() - Disable a clock. + * @clk: The clock to manipulate. + * + * Return: zero on success, or -ve error code. + */ +int rockchip_usb2phy_clk_disable(struct clk *clk) +{ + struct udevice *parent = dev_get_parent(clk->dev); + struct rockchip_usb2phy *priv = dev_get_priv(parent); + const struct rockchip_usb2phy_cfg *phy_cfg = priv->phy_cfg; + + /* turn off 480m clk output */ + property_enable(priv->reg_base, &phy_cfg->clkout_ctl, false); + + return 0; +} + static struct clk_ops rockchip_usb2phy_clk_ops = { + .enable = rockchip_usb2phy_clk_enable, + .disable = rockchip_usb2phy_clk_disable, + .round_rate = rockchip_usb2phy_clk_round_rate }; static int rockchip_usb2phy_probe(struct udevice *dev) @@ -255,8 +324,11 @@ static int rockchip_usb2phy_bind(struct udevice *dev) } node = dev_ofnode(dev); - name = ofnode_get_name(node); - dev_dbg(dev, "clk for node %s\n", name); + name = "clk_usbphy_480m"; + dev_read_string_index(dev, "clock-output-names", 0, &name); + + dev_dbg(dev, "clk %s for node %s\n", name, ofnode_get_name(node)); + ret = device_bind_driver_to_node(dev, "rockchip_usb2phy_clock", name, node, &usb2phy_dev); if (ret) { @@ -276,6 +348,7 @@ bind_fail: static const struct rockchip_usb2phy_cfg rk3399_usb2phy_cfgs[] = { { .reg = 0xe450, + .clkout_ctl = { 0xe450, 4, 4, 1, 0 }, .port_cfgs = { [USB2PHY_PORT_OTG] = { .phy_sus = { 0xe454, 1, 0, 2, 1 }, @@ -297,6 +370,7 @@ static const struct rockchip_usb2phy_cfg rk3399_usb2phy_cfgs[] = { }, { .reg = 0xe460, + .clkout_ctl = { 0xe460, 4, 4, 1, 0 }, .port_cfgs = { [USB2PHY_PORT_OTG] = { .phy_sus = { 0xe464, 1, 0, 2, 1 }, @@ -322,6 +396,7 @@ static const struct rockchip_usb2phy_cfg rk3399_usb2phy_cfgs[] = { static const struct rockchip_usb2phy_cfg rk3568_phy_cfgs[] = { { .reg = 0xfe8a0000, + .clkout_ctl = { 0x0008, 4, 4, 1, 0 }, .port_cfgs = { [USB2PHY_PORT_OTG] = { .phy_sus = { 0x0000, 8, 0, 0x052, 0x1d1 }, @@ -347,6 +422,7 @@ static const struct rockchip_usb2phy_cfg rk3568_phy_cfgs[] = { }, { .reg = 0xfe8b0000, + .clkout_ctl = { 0x0008, 4, 4, 1, 0 }, .port_cfgs = { [USB2PHY_PORT_OTG] = { .phy_sus = { 0x0000, 8, 0, 0x1d2, 0x1d1 },