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Date: Fri, 3 Aug 2012 19:53:41 +0530
From: "ABRAHAM, KISHON VIJAY" <kishon@...com>
To: balbi@...com
Cc: grant.likely@...retlab.ca, rob.herring@...xeda.com,
rob@...dley.net, linux@....linux.org.uk, b-cousson@...com,
rnayak@...com, tony@...mide.com, gregkh@...uxfoundation.org,
ohad@...ery.com, linus.walleij@...aro.org,
myungjoo.ham@...sung.com, rusty@...tcorp.com.au,
swarren@...dia.com, devicetree-discuss@...ts.ozlabs.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/2] drivers: bus: add a new driver for omap-ocp2scp
Hi,
On Fri, Aug 3, 2012 at 6:50 PM, Felipe Balbi <balbi@...com> wrote:
> Hi,
>
> On Wed, Jul 18, 2012 at 12:00:38PM +0530, Kishon Vijay Abraham I wrote:
>> Adds a new driver *omap-ocp2scp*. This driver takes the responsibility of
>> creating all the devices that is connected to OCP2SCP. In the case of OMAP4,
>> USB2PHY is connected to ocp2scp.
>>
>> This also includes device tree support for ocp2scp driver and
>> the documentation with device tree binding information is updated.
>>
>> Cc: Felipe Balbi <balbi@...com>
>
> If you fix (or change my mind) on the comment below, you can add:
>
> Acked-by: Felipe Balbi <balbi@...com>
>
>
> Also, I wonder who should be the one to take this. Who will be queueing
> patches on this directory to mainline ?
>
>> Acked-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>> .../devicetree/bindings/bus/omap-ocp2scp.txt | 10 ++
>> drivers/Kconfig | 2 +
>> drivers/Makefile | 2 +
>> drivers/bus/Kconfig | 15 +++
>> drivers/bus/Makefile | 5 +
>> drivers/bus/omap-ocp2scp.c | 98 ++++++++++++++++++++
>> 6 files changed, 132 insertions(+), 0 deletions(-)
>> create mode 100644 Documentation/devicetree/bindings/bus/omap-ocp2scp.txt
>> create mode 100644 drivers/bus/Kconfig
>> create mode 100644 drivers/bus/Makefile
>> create mode 100644 drivers/bus/omap-ocp2scp.c
>>
>> diff --git a/Documentation/devicetree/bindings/bus/omap-ocp2scp.txt b/Documentation/devicetree/bindings/bus/omap-ocp2scp.txt
>> new file mode 100644
>> index 0000000..d2fe064
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/bus/omap-ocp2scp.txt
>> @@ -0,0 +1,10 @@
>> +* OMAP OCP2SCP - ocp interface to scp interface
>> +
>> +properties:
>> +- compatible : Should be "ti,omap-ocp2scp"
>> +- #address-cells, #size-cells : Must be present if the device has sub-nodes
>> +- ranges : the child address space are mapped 1:1 onto the parent address space
>> +- ti,hwmods : must be "ocp2scp_usb_phy"
>> +
>> +Sub-nodes:
>> +All the devices connected to ocp2scp are described using sub-node to ocp2scp
>> diff --git a/drivers/Kconfig b/drivers/Kconfig
>> index bfc9186..4fe1e4c 100644
>> --- a/drivers/Kconfig
>> +++ b/drivers/Kconfig
>> @@ -2,6 +2,8 @@ menu "Device Drivers"
>>
>> source "drivers/base/Kconfig"
>>
>> +source "drivers/bus/Kconfig"
>> +
>> source "drivers/connector/Kconfig"
>>
>> source "drivers/mtd/Kconfig"
>> diff --git a/drivers/Makefile b/drivers/Makefile
>> index 2ba29ff..cac3819 100644
>> --- a/drivers/Makefile
>> +++ b/drivers/Makefile
>> @@ -5,6 +5,8 @@
>> # Rewritten to use lists instead of if-statements.
>> #
>>
>> +obj-y += bus/
>> +
>> # GPIO must come after pinctrl as gpios may need to mux pins etc
>> obj-y += pinctrl/
>> obj-y += gpio/
>> diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
>> new file mode 100644
>> index 0000000..6270415
>> --- /dev/null
>> +++ b/drivers/bus/Kconfig
>> @@ -0,0 +1,15 @@
>> +#
>> +# Bus Devices
>> +#
>> +
>> +menu "Bus devices"
>> +
>> +config OMAP_OCP2SCP
>> + tristate "OMAP OCP2SCP DRIVER"
>> + help
>> + Driver to enable ocp2scp module which transforms ocp interface
>> + protocol to scp protocol. In OMAP4, USB PHY is connected via
>> + OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via
>> + OCP2SCP.
>> +
>> +endmenu
>> diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
>> new file mode 100644
>> index 0000000..0ec50bc
>> --- /dev/null
>> +++ b/drivers/bus/Makefile
>> @@ -0,0 +1,5 @@
>> +#
>> +# Makefile for the bus drivers.
>> +#
>> +
>> +obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
>> diff --git a/drivers/bus/omap-ocp2scp.c b/drivers/bus/omap-ocp2scp.c
>> new file mode 100644
>> index 0000000..8c3db3a
>> --- /dev/null
>> +++ b/drivers/bus/omap-ocp2scp.c
>> @@ -0,0 +1,98 @@
>> +/*
>> + * omap-ocp2scp.c - transform ocp interface protocol to scp protocol
>> + *
>> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * Author: Kishon Vijay Abraham I <kishon@...com>
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/err.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/of.h>
>> +#include <linux/of_platform.h>
>> +
>> +static int ocp2scp_remove_devices(struct device *dev, void *c)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> +
>> + platform_device_unregister(pdev);
>> +
>> + return 0;
>> +}
>> +
>> +static int __devinit omap_ocp2scp_probe(struct platform_device *pdev)
>> +{
>> + int ret;
>> + struct device_node *np = pdev->dev.of_node;
>> +
>> + if (np) {
>> + ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
>> + if (ret) {
>> + dev_err(&pdev->dev, "failed to add resources for ocp2scp child\n");
>> + goto err0;
>> + }
>> + }
>> + pm_runtime_enable(&pdev->dev);
>> +
>> + return 0;
>> +
>> +err0:
>> + device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
>> +
>> + return ret;
>> +}
>> +
>> +static int __devexit omap_ocp2scp_remove(struct platform_device *pdev)
>> +{
>> + pm_runtime_disable(&pdev->dev);
>> + device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id omap_ocp2scp_id_table[] = {
>> + { .compatible = "ti,omap-ocp2scp" },
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
>> +#endif
>> +
>> +static struct platform_driver omap_ocp2scp_driver = {
>> + .probe = omap_ocp2scp_probe,
>> + .remove = __devexit_p(omap_ocp2scp_remove),
>> + .driver = {
>> + .name = "omap-ocp2scp",
>> + .owner = THIS_MODULE,
>> + .of_match_table = of_match_ptr(omap_ocp2scp_id_table),
>> + },
>> +};
>> +
>> +static int __init omap_ocp2scp_init(void)
>> +{
>> + return platform_driver_register(&omap_ocp2scp_driver);
>> +}
>> +arch_initcall(omap_ocp2scp_init);
>
> I really think we should avoid this trickery and make dependent drivers
> return -EPROBE_DEFER case this isn't ready yet.
Ok. Will do it that way in my next series.
Thanks
Kishon
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