[PATCH 02/13] nvmem: treat devices without nvmem_bus::write as read only
From: Ahmad Fatoum <a.fatoum@pengutronix.de>
Date: 2021-06-19 03:47:16
Subsystem:
nvmem framework, the rest · Maintainers:
Srinivas Kandagatla, Linus Torvalds
nvmem_bus::write is dereferenced unconditionally when doing write operations. Align behavior with Linux, which allows drivers to omit the reg_write callback when the device is known to be read-only. Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> --- drivers/nvmem/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index cfeecf70cd5d..3c14e390de39 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c@@ -209,8 +209,8 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config) nvmem->dev.device_node = np; nvmem->priv = config->priv; - nvmem->read_only = of_property_read_bool(np, "read-only") | - config->read_only; + if (config->read_only || !config->bus->write || of_property_read_bool(np, "read-only")) + nvmem->read_only = true; dev_set_name(&nvmem->dev, config->name); nvmem->dev.id = DEVICE_ID_DYNAMIC;
--
2.29.2
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