phy: Add USB HSIC PHY driver for Marvell MMP3 SoC

Add PHY driver for the HSICs found on Marvell MMP3 SoC. The driver is
rather straightforward -- the PHY essentially just needs to be enabled.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200925235828.228626-4-lkundrak@v3.sk
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/marvell/Kconfig b/drivers/phy/marvell/Kconfig
index 8f6273c..6c96f2b 100644 (file)
--- a/drivers/phy/marvell/Kconfig
+++ b/drivers/phy/marvell/Kconfig
@@ -116,3 +116,15 @@ config PHY_MMP3_USB
          The PHY driver will be used by Marvell udc/ehci/otg driver.
 
          To compile this driver as a module, choose M here.
+
+config PHY_MMP3_HSIC
+       tristate "Marvell MMP3 USB HSIC PHY Driver"
+       depends on MACH_MMP3_DT || COMPILE_TEST
+       select GENERIC_PHY
+       help
+         Enable this to support Marvell MMP3 USB HSIC PHY driver for
+         Marvell MMP3 SoC. This driver will be used my the Marvell EHCI
+         driver to initialize the interface to internal USB HSIC
+         components on MMP3-based boards.
+
+         To compile this driver as a module, choose M here.

diff --git a/drivers/phy/marvell/Makefile b/drivers/phy/marvell/Makefile
index 5a106b1..7f296ef 100644 (file)
--- a/drivers/phy/marvell/Makefile
+++ b/drivers/phy/marvell/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_ARMADA375_USBCLUSTER_PHY)  += phy-armada375-usb2.o
 obj-$(CONFIG_PHY_BERLIN_SATA)          += phy-berlin-sata.o
 obj-$(CONFIG_PHY_BERLIN_USB)           += phy-berlin-usb.o
 obj-$(CONFIG_PHY_MMP3_USB)             += phy-mmp3-usb.o
+obj-$(CONFIG_PHY_MMP3_HSIC)            += phy-mmp3-hsic.o
 obj-$(CONFIG_PHY_MVEBU_A3700_COMPHY)   += phy-mvebu-a3700-comphy.o
 obj-$(CONFIG_PHY_MVEBU_A3700_UTMI)     += phy-mvebu-a3700-utmi.o
 obj-$(CONFIG_PHY_MVEBU_A38X_COMPHY)    += phy-armada38x-comphy.o

diff --git a/drivers/phy/marvell/phy-mmp3-hsic.c b/drivers/phy/marvell/phy-mmp3-hsic.c
new file mode 100644 (file)
index 0000000..47c1e88
--- /dev/null
+++ b/drivers/phy/marvell/phy-mmp3-hsic.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#define HSIC_CTRL      0x08
+#define HSIC_ENABLE    BIT(7)
+#define PLL_BYPASS     BIT(4)
+
+static int mmp3_hsic_phy_init(struct phy *phy)
+{
+       void __iomem *base = (void __iomem *)phy_get_drvdata(phy);
+       u32 hsic_ctrl;
+
+       hsic_ctrl = readl_relaxed(base + HSIC_CTRL);
+       hsic_ctrl |= HSIC_ENABLE;
+       hsic_ctrl |= PLL_BYPASS;
+       writel_relaxed(hsic_ctrl, base + HSIC_CTRL);
+
+       return 0;
+}
+
+static const struct phy_ops mmp3_hsic_phy_ops = {
+       .init           = mmp3_hsic_phy_init,
+       .owner          = THIS_MODULE,
+};
+
+static const struct of_device_id mmp3_hsic_phy_of_match[] = {
+       { .compatible = "marvell,mmp3-hsic-phy", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, mmp3_hsic_phy_of_match);
+
+static int mmp3_hsic_phy_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct phy_provider *provider;
+       struct resource *resource;
+       void __iomem *base;
+       struct phy *phy;
+
+       resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       base = devm_ioremap_resource(dev, resource);
+       if (IS_ERR(base)) {
+               dev_err(dev, "failed to remap PHY regs\n");
+               return PTR_ERR(base);
+       }
+
+       phy = devm_phy_create(dev, NULL, &mmp3_hsic_phy_ops);
+       if (IS_ERR(phy)) {
+               dev_err(dev, "failed to create PHY\n");
+               return PTR_ERR(phy);
+       }
+
+       phy_set_drvdata(phy, (void *)base);
+       provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+       if (IS_ERR(provider)) {
+               dev_err(dev, "failed to register PHY provider\n");
+               return PTR_ERR(provider);
+       }
+
+       return 0;
+}
+
+static struct platform_driver mmp3_hsic_phy_driver = {
+       .probe          = mmp3_hsic_phy_probe,
+       .driver         = {
+               .name   = "mmp3-hsic-phy",
+               .of_match_table = mmp3_hsic_phy_of_match,
+       },
+};
+module_platform_driver(mmp3_hsic_phy_driver);
+
+MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
+MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
+MODULE_LICENSE("GPL");