From b85c943d181ac58e3a34a5f79c73d421f4da7b00 Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Wed, 26 May 2021 11:32:40 +0200 Subject: mtd: rawnand: Add a helper to parse the gpio-cs DT property New chips may feature a lot of CS because of their extended length. As many controllers have been designed a decade ago, they usually only feature just a couple. This does not mean that the entire range of these chips cannot be accessed: it is just a matter of adding more GPIO CS in the hardware design. A DT property has been added to describe the CS array: cs-gpios. Here is the code parsing it this new property, allocating what needs to be, requesting the GPIOs and returning an array with the additional available CS. The first entries of this array are left empty and are reserved for native CS. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210526093242.183847-3-miquel.raynal@bootlin.com --- include/linux/mtd/rawnand.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h index d41d39360fff..b2f9dd3cbd69 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -1595,4 +1595,8 @@ static inline void *nand_get_data_buf(struct nand_chip *chip) return chip->data_buf; } +/* Parse the gpio-cs property */ +int rawnand_dt_parse_gpio_cs(struct device *dev, struct gpio_desc ***cs_array, + unsigned int *ncs_array); + #endif /* __LINUX_MTD_RAWNAND_H */ -- cgit v1.2.3