linux-kernel - Re: [PATCH] phy: Add USB HSIC PHY driver for Marvell MMP3 SoC

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Message-ID: <0d141fd7-274f-e9da-7cd0-68eb026d5c3c@ti.com>
Date:   Fri, 13 Mar 2020 16:52:00 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lubomir Rintel <lkundrak@...sk>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: Add USB HSIC PHY driver for Marvell MMP3 SoC

Hi,

On 09/03/20 6:28 pm, Lubomir Rintel wrote:
> 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@...sk>
> ---
>  drivers/phy/marvell/Kconfig         | 12 +++++
>  drivers/phy/marvell/Makefile        |  1 +
>  drivers/phy/marvell/phy-mmp3-hsic.c | 82 +++++++++++++++++++++++++++++
>  3 files changed, 95 insertions(+)
>  create mode 100644 drivers/phy/marvell/phy-mmp3-hsic.c
> 
> diff --git a/drivers/phy/marvell/Kconfig b/drivers/phy/marvell/Kconfig
> index 8f6273c837ec3..6c96f2bf52665 100644
> --- 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 5a106b1549f41..7f296ef028292 100644
> --- 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
> index 0000000000000..f7b430f6f6f05
> --- /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@...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 = 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", },

Where is the binding documentation for this?

Thanks
Kishon

> +	{ },
> +};
> +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, 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@...sk>");
> +MODULE_DESCRIPTION("Marvell MMP3 USB HSIC PHY Driver");
> +MODULE_LICENSE("GPL");
>