Passing NAND mtdparts to OMAP2+ Kernel

[Roger Quadros]

Adam,

On 29/03/17 14:39, Adam Ford wrote:
> On Tue, Mar 28, 2017 at 2:57 PM, Boris Brezillon
> <boris.brezillon at free-electrons.com> wrote:
>> +Roger and Enrico
>>
>> On Tue, 28 Mar 2017 10:43:01 -0500
>> Adam Ford <aford173 at gmail.com> wrote:
>>
>>> I posted this on the linux-omap list, and I was asked to post this on
>>> the linux-mtd list:
>>>
>>>
>>> I tried to remove the MTD partitions from the Linux device tree, and I
>>> noticed that there was no partition information being pushed anymore
>>> unless I changed the mtdparts name in U-Boot.
>>>
>>> It appears as if the MTD drivers have changed a bit.  I found a few
>>> e-mails floating around that attempt to fix this
>>>
>>> Commit f7a8e38f07a17be907585 ("mtd: nand: assign reasonable default
>>> name for NAND drivers") attempts to address this, and someone over at
>>> https://patchwork.ozlabs.org/patch/707065/ attempted to address it as
>>> well in a slightly different way.
>>
>> Can you test the patch and let me know if solves the problem. If it
>> does, I'll send a clean version of the patch and queue it for 4.12.
>>
> 
> I tried to apply the patch directly, but it failed.  I then manually
> copy-pasted it into the proper place, but it fails to compile.
> 
> drivers/mtd/nand/omap2.c: In function ‘omap_nand_probe’:
> drivers/mtd/nand/omap2.c:1859:14: error: implicit declaration of
> function ‘devm_kasprinf’ [-Werror=implicit-function-declaration]
>   mtd->name = devm_kasprinf(&pdev->dev, "omap2-nand.%d", info->gpmc_cs);
>               ^~~~~~~~~~~~~
> drivers/mtd/nand/omap2.c:1859:12: warning: assignment makes pointer
> from integer without a cast [-Wint-conversion]
>   mtd->name = devm_kasprinf(&pdev->dev, "omap2-nand.%d", info->gpmc_cs);
>             ^
> cc1: some warnings being treated as errors
> 
> I use buildroot to build my toolchain and I am using gcc version 6.3.0
> with glibc 2.24.  Is there supposed to be an include somewhere?  I am
> not familiar with devm_kasprinf.
> 
> 

Does the below patch work for you?

cheers,
-roger

---
 drivers/mtd/nand/omap2.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 2a52101..f693b8d 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1856,6 +1856,13 @@ static int omap_nand_probe(struct platform_device *pdev)
 	nand_chip->ecc.priv	= NULL;
 	nand_set_flash_node(nand_chip, dev->of_node);
 
+	mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "omap2-nand.%d",
+				   info->gpmc_cs);
+	if (!mtd->name) {
+		dev_err(&pdev->dev, "Failed to set MTD name\n");
+		return -ENOMEM;
+	}
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	nand_chip->IO_ADDR_R = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(nand_chip->IO_ADDR_R))
-- 
2.7.4