From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from arroyo.ext.ti.com ([192.94.94.40]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ae0VN-0003MA-2J for linux-mtd@lists.infradead.org; Thu, 10 Mar 2016 13:19:54 +0000 Subject: Re: [PATCH v3 1/6] memory: omap-gpmc: Store handle to GPMC dev To: Roger Quadros , , , , , , , , References: <1457582861-20619-1-git-send-email-fcooper@ti.com> <1457582861-20619-2-git-send-email-fcooper@ti.com> <56E16B20.5070001@ti.com> From: "Franklin S Cooper Jr." Message-ID: <56E1743C.90805@ti.com> Date: Thu, 10 Mar 2016 07:18:52 -0600 MIME-Version: 1.0 In-Reply-To: <56E16B20.5070001@ti.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 03/10/2016 06:40 AM, Roger Quadros wrote: > Franklin, > > On 10/03/16 06:07, Franklin S Cooper Jr wrote: >> The dma channel information is located within the GPMC node. The NAND >> driver requires a handle to the GPMC's dev to properly parse the DMA >> properties. Therefore, store a handle to the dev so it can be referenced >> within the NAND driver. >> >> Signed-off-by: Franklin S Cooper Jr >> --- >> drivers/memory/omap-gpmc.c | 1 + >> include/linux/platform_data/mtd-nand-omap2.h | 2 ++ >> 2 files changed, 3 insertions(+) >> >> diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c >> index 6515dfc..2932d13 100644 >> --- a/drivers/memory/omap-gpmc.c >> +++ b/drivers/memory/omap-gpmc.c >> @@ -1796,6 +1796,7 @@ static int gpmc_probe_nand_child(struct platform_device *pdev, >> >> gpmc_nand_data->cs = val; >> gpmc_nand_data->of_node = child; >> + gpmc_nand_data->gpmc_dev = &pdev->dev; >> >> /* Detect availability of ELM module */ >> gpmc_nand_data->elm_of_node = of_parse_phandle(child, "ti,elm-id", 0); >> diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h >> index 090bbab..534b984 100644 >> --- a/include/linux/platform_data/mtd-nand-omap2.h >> +++ b/include/linux/platform_data/mtd-nand-omap2.h >> @@ -80,5 +80,7 @@ struct omap_nand_platform_data { >> /* for passing the partitions */ >> struct device_node *of_node; >> struct device_node *elm_of_node; >> + >> + struct device *gpmc_dev; >> }; >> #endif >> > Why do you need this? Can't we just use dev->parent in the omap2-nand driver? Dev->parent doesn't point to omap-gpmc's dev. Its because platform_device_alloc is used to create the platform_device so a proper parent isn't defined. It should be possible to force omap2-nand dev's parent property to the GPMC's dev but that didn't seem right when I thought about doing it. > > cheers, > -roger