From: Sekhar Nori <nsekhar@ti.com>
Subject: Re: [PATCH v5 2/5] ARM: davinci: da8xx: Add CFGCHIP syscon platform
 declaration.
Date: Wed, 25 May 2016 16:45:08 +0530
Message-ID: <5745893C.5040603@ti.com>
References: <1462837612-7803-1-git-send-email-david@lechnology.com>
 <1462837612-7803-3-git-send-email-david@lechnology.com>
 <7e0373cf-2ae9-e205-2226-0ded6894b709@cogentembedded.com>
 <57320FE6.60003@lechnology.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="windows-1252"
Content-Transfer-Encoding: 7bit
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <57320FE6.60003@lechnology.com>
Sender: linux-kernel-owner@vger.kernel.org
To: David Lechner <david@lechnology.com>, Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>, khilman@kernel.org
Cc: petr@barix.com, Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, Kishon Vijay Abraham I <kishon@ti.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Alan Stern <stern@rowland.harvard.edu>, Bin Liu <b-liu@ti.com>, Lee Jones <lee.jones@linaro.org>, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
List-Id: devicetree@vger.kernel.org

On Tuesday 10 May 2016 10:14 PM, David Lechner wrote:
> On 05/10/2016 06:26 AM, Sergei Shtylyov wrote:
>> On 5/10/2016 2:46 AM, David Lechner wrote:
>>
>>> The CFGCHIP registers are used by a number of devices, so using a syscon
>>> device to share them. The first consumer of this will by the
>>> phy-da8xx-usb
>>> driver.
>>>
>>> Signed-off-by: David Lechner <david@lechnology.com>
>> [...]
>>> diff --git a/arch/arm/mach-davinci/devices-da8xx.c
>>> b/arch/arm/mach-davinci/devices-da8xx.c
>>> index 725e693..69d11a1 100644
>>> --- a/arch/arm/mach-davinci/devices-da8xx.c
>>> +++ b/arch/arm/mach-davinci/devices-da8xx.c
>>> @@ -11,6 +11,7 @@
>>>   * (at your option) any later version.
>>>   */
>>>  #include <linux/init.h>
>>> +#include <linux/platform_data/syscon.h>
>>>  #include <linux/platform_device.h>
>>>  #include <linux/dma-contiguous.h>
>>>  #include <linux/serial_8250.h>
>>> @@ -1109,3 +1110,30 @@ int __init da850_register_sata(unsigned long
>>> refclkpn)
>>>      return platform_device_register(&da850_sata_device);
>>>  }
>>>  #endif
>>> +
>>> +static struct syscon_platform_data da8xx_cfgchip_platform_data = {
>>> +    .label    = "cfgchip",
>>> +};
>>> +
>>> +static struct resource da8xx_cfgchip_resources[] = {
>>> +    {
>>> +        .start    = DA8XX_SYSCFG0_BASE + DA8XX_CFGCHIP0_REG,
>>> +        .end    = DA8XX_SYSCFG0_BASE + DA8XX_CFGCHIP4_REG + 3,
>>> +        .flags    = IORESOURCE_MEM,
>>> +    },
>>> +};
>>> +
>>> +static struct platform_device da8xx_cfgchip_device = {
>>> +    .name    = "syscon",
>>> +    .id    = 0,
>>
>>     Again, -1.
>>
>> [...]
>>
>> MBR, Sergei
>>
> 
> I wish you would have noticed this when I first submitted it. I remember
> going back and forth about this. But it has been too long and I can't
> remember the reason why I chose to go this way.
> 
> It seems like changing it broke something with either this one or the
> phy device and I opted to keep it this way on both to be consistent. For
> example, the USB devices both use id = 0 as well even though there are
> only one of each type.

Agree with Sergei here. Can you confirm what broke exactly? I think the
USB needs to be fixed too.

Thanks,
Sekhar