linux-kernel - Re: [PATCH v4 3/4] memory: omap-gpmc: Use a compatible match table when checking for NAND controller

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Date:   Wed, 22 Dec 2021 16:49:16 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Roger Quadros <rogerq@...nel.org>
Cc:     tony@...mide.com, robh@...nel.org, kishon@...com, nm@...com,
        vigneshr@...com, linux-mtd@...ts.infradead.org,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/4] memory: omap-gpmc: Use a compatible match table
 when checking for NAND controller

On 22/12/2021 15:18, Miquel Raynal wrote:
> Hi Roger,
> 
> rogerq@...nel.org wrote on Tue, 21 Dec 2021 22:01:28 +0200:
> 
>> Hi Miquel,
>>
>> On 21/12/2021 15:17, Roger Quadros wrote:
>>> As more compatibles can be added to the GPMC NAND controller driver
>>> use a compatible match table.
>>>
>>> Cc: Miquel Raynal <miquel.raynal@...tlin.com>
>>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>>> ---
>>>  drivers/memory/omap-gpmc.c                   | 6 +++++-
>>>  drivers/mtd/nand/raw/omap2.c                 | 5 +----  
>>
>> Will need your Ack for this one as well. Thanks :)
>>
>>
>>>  include/linux/platform_data/mtd-nand-omap2.h | 9 ++++++++-
>>>  3 files changed, 14 insertions(+), 6 deletions(-)  
>>
>> cheers,
>> -roger
>>
>>>
>>> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
>>> index 624153048182..d19ffc895e5b 100644
>>> --- a/drivers/memory/omap-gpmc.c
>>> +++ b/drivers/memory/omap-gpmc.c
>>> @@ -2091,6 +2091,7 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>>>  	u32 val;
>>>  	struct gpio_desc *waitpin_desc = NULL;
>>>  	struct gpmc_device *gpmc = platform_get_drvdata(pdev);
>>> +	bool is_nand = false;
>>>  
>>>  	if (of_property_read_u32(child, "reg", &cs) < 0) {
>>>  		dev_err(&pdev->dev, "%pOF has no 'reg' property\n",
>>> @@ -2183,7 +2184,10 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
>>>  		}
>>>  	}
>>>  
>>> -	if (of_device_is_compatible(child, "ti,omap2-nand")) {
>>> +	if (of_match_node(omap_nand_ids, child))
>>> +		is_nand = true;
>>> +
>>> +	if (is_nand) {
> 
> nitpick: why this intermediate variable?
> 

Indeed, it looks useless. I think it is left-over from previous version.
I will remove it while applying.


Best regards,
Krzysztof