Commit 0347c692 authored by Lubomir Rintel's avatar Lubomir Rintel Committed by Vinod Koul
Browse files

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: default avatarLubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200925235828.228626-4-lkundrak@v3.sk


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent a1b87f1a

drivers/phy/marvell/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -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.

drivers/phy/marvell/Makefile

+1 −0
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@@ -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

drivers/phy/marvell/phy-mmp3-hsic.c

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+82 −0
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// 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");