[PATCH 1/9] mtd: core: add nvmem_write support
From: Marco Felsch <hidden>
Date: 2024-07-01 13:54:16
Also in:
imx, linux-arm-kernel, linux-aspeed, linux-i2c, linux-mips, linux-omap, linux-renesas-soc, linux-tegra, lkml, loongarch
Subsystem:
memory technology devices (mtd), the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
The MTD framework does support the NVMEM framework already but only the read support was implemented. This commit adds the write support if the MTD device supports writing (MTD_WRITEABLE is set). Signed-off-by: Marco Felsch <redacted> --- drivers/mtd/mtdcore.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 724f917f91ba..dcd97e59425e 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c@@ -544,6 +544,20 @@ static int mtd_nvmem_reg_read(void *priv, unsigned int offset, return retlen == bytes ? 0 : -EIO; } +static int mtd_nvmem_reg_write(void *priv, unsigned int offset, + void *val, size_t bytes) +{ + struct mtd_info *mtd = priv; + size_t retlen; + int err; + + err = mtd_write(mtd, offset, bytes, &retlen, val); + if (err && err != -EUCLEAN) + return err; + + return retlen == bytes ? 0 : -EIO; +} + static int mtd_nvmem_add(struct mtd_info *mtd) { struct device_node *node = mtd_get_of_node(mtd);
@@ -555,10 +569,11 @@ static int mtd_nvmem_add(struct mtd_info *mtd) config.owner = THIS_MODULE; config.add_legacy_fixed_of_cells = of_device_is_compatible(node, "nvmem-cells"); config.reg_read = mtd_nvmem_reg_read; + config.reg_write = mtd_nvmem_reg_write; config.size = mtd->size; config.word_size = 1; config.stride = 1; - config.read_only = true; + config.read_only = !(mtd->flags & MTD_WRITEABLE); config.root_only = true; config.ignore_wp = true; config.priv = mtd;
--
2.39.2