Re: [PATCH v2 3/4] usb: musb: da8xx: Add DT support for the DA8xx driver

From: Petr Kulhavy <petr-Qh/3xLP0EvwAvxtiuMwx3w@public.gmane.org>

This adds DT support for TI DA8xx/OMAP-L1x/AM17xx/AM18xx MUSB driver

Signed-off-by: Petr Kulhavy <petr-Qh/3xLP0EvwAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Alexandre Bailon <abailon-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
---
 drivers/usb/musb/da8xx.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index 210b7e4..bfa571d 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c

@@ -6,6 +6,9 @@
  * Based on the DaVinci "glue layer" code.
  * Copyright (C) 2005-2006 by Texas Instruments
  *
+ * DT support
+ * Copyright (c) 2016 Petr Kulhavy <petr-Qh/3xLP0EvwAvxtiuMwx3w@public.gmane.org>
+ *
  * This file is part of the Inventra Controller Driver for Linux.
  *
  * The Inventra Controller Driver for Linux is free software; you

@@ -433,6 +436,21 @@ static int da8xx_musb_exit(struct musb *musb)
 	return 0;
 }

+static inline u8 get_vbus_power(struct device *dev)
+{
+	struct regulator *vbus_supply;
+	int current_uA;
+
+	vbus_supply = regulator_get_optional(dev, "vbus");
+	if (IS_ERR(vbus_supply))
+		return 255;
+	current_uA = regulator_get_current_limit(vbus_supply);
+	regulator_put(vbus_supply);
+	if (current_uA <= 0 || current_uA > 510000)
+		return 255;
+	return current_uA / 1000 / 2;
+}
+
 static const struct musb_platform_ops da8xx_ops = {
 	.quirks		= MUSB_DMA_CPPI | MUSB_INDEXED_EP,
 	.init		= da8xx_musb_init,

@@ -458,6 +476,12 @@ static const struct platform_device_info da8xx_dev_info = {
 	.dma_mask	= DMA_BIT_MASK(32),
 };

+static const struct musb_hdrc_config da8xx_config = {
+	.ram_bits = 10,
+	.num_eps = 5,
+	.multipoint = 1,
+};
+
 static int da8xx_probe(struct platform_device *pdev)
 {
 	struct resource musb_resources[2];

@@ -465,7 +489,9 @@ static int da8xx_probe(struct platform_device *pdev)
 	struct da8xx_glue		*glue;
 	struct platform_device_info	pinfo;
 	struct clk			*clk;
+	struct device_node		*np = pdev->dev.of_node;
 	int				ret;
+	struct resource *res;

 	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
 	if (!glue)

@@ -486,6 +512,18 @@ static int da8xx_probe(struct platform_device *pdev)
 	glue->dev			= &pdev->dev;
 	glue->clk			= clk;

+	if (IS_ENABLED(CONFIG_OF) && np) {
+		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata) {
+			/* FIXME */

+			return -ENOMEM;
+		}
+
+		pdata->config	= &da8xx_config;
+		pdata->mode	= musb_get_mode(&pdev->dev);
+		pdata->power	= get_vbus_power(&pdev->dev);
+	}
+
 	pdata->platform_ops		= &da8xx_ops;

 	glue->usb_phy = usb_phy_generic_register();

@@ -536,11 +574,20 @@ static int da8xx_remove(struct platform_device *pdev)
 	return 0;
 }