Hi Anton, Kishon,
From: Anton Tikhomirov [mailto:av.tikhomirov@xxxxxxxxxxx]
Sent: Thursday, March 06, 2014 9:26 AM
Hi Kamil,
...
+| 3. Supporting SoCs
++--------------------
+
+To support a new SoC a new file should be added to the drivers/phy
+directory. Each SoC's configuration is stored in an instance of the
+struct samsung_usb2_phy_config.
+
+struct samsung_usb2_phy_config {
+ const struct samsung_usb2_common_phy *phys;
+ unsigned int num_phys;
+ bool has_mode_switch;
You missed rate_to_clk here.
Thank you for spotting this.
Kishon: I am sorry that this omission was made. I am happy to send an
updated patchset. However, I want to give some time for any additional
comments. Do you think that we have for this? Is today evening ok with you?
+};
+
...
diff --git a/drivers/phy/phy-samsung-usb2.c b/drivers/phy/phy-samsung-
usb2.c new file mode 100644 index 0000000..c3b7719
--- /dev/null
+++ b/drivers/phy/phy-samsung-usb2.c
@@ -0,0 +1,222 @@
+/*
+ * Samsung SoC USB 1.1/2.0 PHY driver
+ *
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Kamil Debski <k.debski@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include "phy-samsung-usb2.h"
+
+static int samsung_usb2_phy_power_on(struct phy *phy) {
+ struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
+ struct samsung_usb2_phy_driver *drv = inst->drv;
+ int ret;
+
+ dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
+ inst->cfg->label);
+ ret = clk_prepare_enable(drv->clk);
clk_prepare_enable() can sleep, and therefore doesn't allow
samusng_usb2_phy_power_on() to be used in atomic context (e.g. inside
spin_lock-ed area), what sometimes may be desirable.
What about to prepare clock in probe, and just enable it here
(note: clk_enable() doesn't sleep).
From the onward discussion between you and Kishon, I draw the conclusion
that this change is not necessary. Right?