From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-we0-x231.google.com ([2a00:1450:400c:c03::231]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XYLEV-00079d-Ki for linux-mtd@lists.infradead.org; Sun, 28 Sep 2014 20:38:16 +0000 Received: by mail-we0-f177.google.com with SMTP id t60so12000525wes.36 for ; Sun, 28 Sep 2014 13:37:53 -0700 (PDT) From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= To: David Woodhouse , Artem Bityutskiy , Brian Norris , linux-mtd@lists.infradead.org Subject: [PATCH V3] mtd: move support for struct flash_platform_data into m25p80 Date: Sun, 28 Sep 2014 22:36:54 +0200 Message-Id: <1411936614-28886-1-git-send-email-zajec5@gmail.com> In-Reply-To: <1408194788-10434-1-git-send-email-zajec5@gmail.com> References: <1408194788-10434-1-git-send-email-zajec5@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Hauke Mehrtens , =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This "type" seems to be an extra hint for m25p80 about the flash. Some archs register flash_platform_data with "name" set to "m25p80" and then with a real flash name set in "type". It seems to be a trick specific to the m25p80 so let's move it out of spi-nor. Btw switch to the spi_nor_match_id instead of iterating spi_nor_ids. Signed-off-by: Rafał Miłecki --- V2: Comment usage of data->type Set mtd.name in m25p80 V3: Fix "respect" spelling in the comment Brian: do you think this comment about "name" and "type" is clear enough now? If so, could you pick this patch, please? --- drivers/mtd/devices/m25p80.c | 22 ++++++++++++++++++++-- drivers/mtd/spi-nor/spi-nor.c | 28 +--------------------------- 2 files changed, 21 insertions(+), 29 deletions(-) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index ed7e0a1b..dcda628 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -193,11 +193,14 @@ static int m25p_probe(struct spi_device *spi) { struct mtd_part_parser_data ppdata; struct flash_platform_data *data; + const struct spi_device_id *id = NULL; struct m25p *flash; struct spi_nor *nor; enum read_mode mode = SPI_NOR_NORMAL; int ret; + data = dev_get_platdata(&spi->dev); + flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL); if (!flash) return -ENOMEM; @@ -223,11 +226,26 @@ static int m25p_probe(struct spi_device *spi) mode = SPI_NOR_QUAD; else if (spi->mode & SPI_RX_DUAL) mode = SPI_NOR_DUAL; - ret = spi_nor_scan(nor, spi_get_device_id(spi), mode); + + if (data && data->name) + flash->mtd.name = data->name; + + /* For some (historical?) reason many platforms provide two different + * names in flash_platform_data: "name" and "type". Quite often name is + * set to "m25p80" and then "type" provides a real chip name. + * If that's the case, respect "type" and ignore a "name". + */ + if (data && data->type) + id = spi_nor_match_id(data->type); + + /* If we didn't get name from platform, simply use "modalias". */ + if (!id) + id = spi_get_device_id(spi); + + ret = spi_nor_scan(nor, id, mode); if (ret) return ret; - data = dev_get_platdata(&spi->dev); ppdata.of_node = spi->dev.of_node; return mtd_device_parse_register(&flash->mtd, NULL, &ppdata, diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 11459f6..ae16aa2 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -915,7 +915,6 @@ int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id, enum read_mode mode) { struct flash_info *info; - struct flash_platform_data *data; struct device *dev = nor->dev; struct mtd_info *mtd = nor->mtd; struct device_node *np = dev->of_node; @@ -926,28 +925,6 @@ int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id, if (ret) return ret; - /* Platform data helps sort out which chip type we have, as - * well as how this board partitions it. If we don't have - * a chip ID, try the JEDEC id commands; they'll work for most - * newer chips, even if we don't recognize the particular chip. - */ - data = dev_get_platdata(dev); - if (data && data->type) { - const struct spi_device_id *plat_id; - - for (i = 0; i < ARRAY_SIZE(spi_nor_ids) - 1; i++) { - plat_id = &spi_nor_ids[i]; - if (strcmp(data->type, plat_id->name)) - continue; - break; - } - - if (i < ARRAY_SIZE(spi_nor_ids) - 1) - id = plat_id; - else - dev_warn(dev, "unrecognized id %s\n", data->type); - } - info = (void *)id->driver_data; if (info->jedec_id) { @@ -985,11 +962,8 @@ int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id, write_sr(nor, 0); } - if (data && data->name) - mtd->name = data->name; - else + if (!mtd->name) mtd->name = dev_name(dev); - mtd->type = MTD_NORFLASH; mtd->writesize = 1; mtd->flags = MTD_CAP_NORFLASH; -- 1.8.4.5