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Date: Sat, 3 Nov 2018 00:56:13 +0530
From: Faiz Abbas <faiz_abbas@...com>
To: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<netdev@...r.kernel.org>, <linux-can@...r.kernel.org>
CC: <wg@...ndegger.com>, <mkl@...gutronix.de>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <kishon@...com>, <faiz_abbas@...com>
Subject: [PATCH 3/6] phy: phy-of-simple: Add support for simple generic phy driver
A good number of phy implementations don't have a dedicated register
map and only do simple clock or regulator configurations. Add support
for a generic driver which just does such simple configurations.
The driver optionally gets all the generic phy attributes and also the
pwr regulator node. It also includes a generic implementation of
phy_power_on() and phy_power_off().
Signed-off-by: Faiz Abbas <faiz_abbas@...com>
---
drivers/phy/Kconfig | 7 +++
drivers/phy/Makefile | 1 +
drivers/phy/phy-of-simple.c | 90 +++++++++++++++++++++++++++++++++++++
3 files changed, 98 insertions(+)
create mode 100644 drivers/phy/phy-of-simple.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 60f949e2a684..e66039560da9 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -40,6 +40,13 @@ config PHY_XGENE
help
This option enables support for APM X-Gene SoC multi-purpose PHY.
+config PHY_OF_SIMPLE
+ tristate "PHY Simple Driver"
+ select GENERIC_PHY
+ help
+ This driver supports simple generic phy implementations which don't
+ need a dedicated register map.
+
source "drivers/phy/allwinner/Kconfig"
source "drivers/phy/amlogic/Kconfig"
source "drivers/phy/broadcom/Kconfig"
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 0301e25d07c1..ffef0fdf2c68 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -4,6 +4,7 @@
#
obj-$(CONFIG_GENERIC_PHY) += phy-core.o
+obj-$(CONFIG_PHY_OF_SIMPLE) += phy-of-simple.o
obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o
obj-$(CONFIG_PHY_XGENE) += phy-xgene.o
obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o
diff --git a/drivers/phy/phy-of-simple.c b/drivers/phy/phy-of-simple.c
new file mode 100644
index 000000000000..0194aae90d3c
--- /dev/null
+++ b/drivers/phy/phy-of-simple.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * phy-of-simple.c - phy driver for simple implementations
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
+ *
+ */
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+
+static int phy_simple_power_on(struct phy *phy)
+{
+ if (phy->pwr)
+ return regulator_enable(phy->pwr);
+
+ return 0;
+}
+
+static int phy_simple_power_off(struct phy *phy)
+{
+ if (phy->pwr)
+ return regulator_disable(phy->pwr);
+
+ return 0;
+}
+
+static const struct phy_ops phy_simple_ops = {
+ .power_on = phy_simple_power_on,
+ .power_off = phy_simple_power_off,
+ .owner = THIS_MODULE,
+};
+
+int phy_simple_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ struct device *dev = &pdev->dev;
+ struct regulator *pwr = NULL;
+ struct phy *phy;
+ u32 bus_width = 0;
+ u32 max_bitrate = 0;
+ int ret;
+
+ phy = devm_phy_create(dev, dev->of_node,
+ &phy_simple_ops);
+
+ if (IS_ERR(phy)) {
+ dev_err(dev, "Failed to create phy\n");
+ return PTR_ERR(phy);
+ }
+
+ device_property_read_u32(dev, "bus-width", &bus_width);
+ phy->attrs.bus_width = bus_width;
+ device_property_read_u32(dev, "max-bitrate", &max_bitrate);
+ phy->attrs.max_bitrate = max_bitrate;
+
+ pwr = devm_regulator_get_optional(dev, "pwr");
+ if (IS_ERR(pwr)) {
+ ret = PTR_ERR(pwr);
+ dev_err(dev, "Couldn't get regulator. ret=%d\n", ret);
+ return ret;
+ }
+ phy->pwr = pwr;
+
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id phy_simple_dt_ids[] = {
+ { .compatible = "simple-phy"},
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, phy_simple_phy_dt_ids);
+
+static struct platform_driver phy_simple_driver = {
+ .probe = phy_simple_probe,
+ .driver = {
+ .name = "phy-of-simple",
+ .of_match_table = phy_simple_dt_ids,
+ },
+};
+
+module_platform_driver(phy_simple_driver);
+
+MODULE_AUTHOR("Faiz Abbas <faiz_abbas@...com>");
+MODULE_DESCRIPTION("Simple PHY driver");
+MODULE_LICENSE("GPL v2");
--
2.18.0
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