linux-kernel - Re: [PATCH 6/9] ARM: davinci: da830-evm: use aemif platform driver

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Message-ID: <ac232c64-0efb-fd0a-740f-8d63178cdf95@lechnology.com>
Date:   Mon, 25 Jun 2018 11:29:27 -0500
From:   David Lechner <david@...hnology.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>, Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 6/9] ARM: davinci: da830-evm: use aemif platform driver

On 06/25/2018 11:23 AM, Bartosz Golaszewski wrote:
> 2018-06-25 18:20 GMT+02:00 David Lechner <david@...hnology.com>:
>> On 06/25/2018 10:29 AM, Bartosz Golaszewski wrote:
>>>
>>> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>>
>>> We now support board files in the aemif driver. Register a platform
>>> device instead of using the handcrafted API in da830-evm.
>>>
>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>> ---
>>>    arch/arm/mach-davinci/board-da830-evm.c | 56 +++++++++++++++++++------
>>>    1 file changed, 44 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-davinci/board-da830-evm.c
>>> b/arch/arm/mach-davinci/board-da830-evm.c
>>> index b2470141dba3..666db3cee08a 100644
>>> --- a/arch/arm/mach-davinci/board-da830-evm.c
>>> +++ b/arch/arm/mach-davinci/board-da830-evm.c
>>> @@ -28,6 +28,7 @@
>>>    #include <linux/platform_data/mtd-davinci-aemif.h>
>>>    #include <linux/platform_data/spi-davinci.h>
>>>    #include <linux/platform_data/usb-davinci.h>
>>> +#include <linux/platform_data/ti-aemif.h>
>>>    #include <linux/regulator/machine.h>
>>>      #include <asm/mach-types.h>
>>> @@ -333,14 +334,48 @@ static struct resource da830_evm_nand_resources[] =
>>> {
>>>          },
>>>    };
>>>    -static struct platform_device da830_evm_nand_device = {
>>> -       .name           = "davinci_nand",
>>> -       .id             = 1,
>>> -       .dev            = {
>>> -               .platform_data  = &da830_evm_nand_pdata,
>>> +static struct platform_device da830_evm_aemif_devices[] = {
>>> +       {
>>> +               .name           = "davinci_nand",
>>> +               .id             = 1,
>>
>>
>> Actually, now that I've thought about it some more. It probably
>> makes more sense to make all of the "davinci_nand" devices in this
>> series use id = -1 since there is only one per board. It looks like
>> da850 is the only one that has a lookup for "davinic_nand.0" already.
>>
>> I think that we are going to have to add clock lookups for the
>> "davinci_nand" devices as well. Although the driver doesn't do
>> clk_get() explicitly, I think some function it calls does get a
>> clock. I remember that we had to add a clock-ranges property to
>> device tree to get the davinci_nand driver working, which is why
>> I think we are going to need a clock lookup for these devices
>> as well.
>>
> 
> Seems like ever since commit a8e3923ab571 ("mtd: rawnand: davinci:
> don't acquire and enable clock") we no longer need to worry about the
> clock entries for nand.
> 
> Thanks,
> Bart
> 

Sounds good. If you end up touching the da850 clock lookups, you can
probably drop the "davinci_nand.0" entry there.