From 10098cac9735bdbbd3f46f7af8731cbc154ad3ca Mon Sep 17 00:00:00 2001 From: Roger Quadros Date: Tue, 12 Mar 2013 13:24:26 +0200 Subject: [PATCH] USB: phy: nop: Defer probe if device needs VCC/RESET Add 2 flags, needs_vcc and needs_reset to platform data. If the flag is set and the regulator couldn't be found then we bail out with -EPROBE_DEFER. For device tree boot we depend on presensce of vcc-supply/ reset-supply properties to decide if we should bail out with -EPROBE_DEFER or just continue in case the regulator can't be found. This is required for proper functionality in cases where the regulator is needed but is probed later than the PHY device. Signed-off-by: Roger Quadros Signed-off-by: Felipe Balbi --- drivers/usb/otg/nop-usb-xceiv.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c index b26b1c29194ed..2b10cc969bbb1 100644 --- a/drivers/usb/otg/nop-usb-xceiv.c +++ b/drivers/usb/otg/nop-usb-xceiv.c @@ -147,6 +147,8 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev) enum usb_phy_type type = USB_PHY_TYPE_USB2; int err; u32 clk_rate = 0; + bool needs_vcc = false; + bool needs_reset = false; nop = devm_kzalloc(&pdev->dev, sizeof(*nop), GFP_KERNEL); if (!nop) @@ -163,9 +165,14 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev) if (of_property_read_u32(node, "clock-frequency", &clk_rate)) clk_rate = 0; + needs_vcc = of_property_read_bool(node, "vcc-supply"); + needs_reset = of_property_read_bool(node, "reset-supply"); + } else if (pdata) { type = pdata->type; clk_rate = pdata->clk_rate; + needs_vcc = pdata->needs_vcc; + needs_reset = pdata->needs_reset; } nop->clk = devm_clk_get(&pdev->dev, "main_clk"); @@ -194,12 +201,16 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev) if (IS_ERR(nop->vcc)) { dev_dbg(&pdev->dev, "Error getting vcc regulator: %ld\n", PTR_ERR(nop->vcc)); + if (needs_vcc) + return -EPROBE_DEFER; } nop->reset = devm_regulator_get(&pdev->dev, "reset"); if (IS_ERR(nop->reset)) { dev_dbg(&pdev->dev, "Error getting reset regulator: %ld\n", PTR_ERR(nop->reset)); + if (needs_reset) + return -EPROBE_DEFER; } nop->dev = &pdev->dev; -- 2.39.5