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Message-Id: <CZ6DFL6061FS.2WMDPMSSBXX8S@walle.cc>
Date: Fri, 16 Feb 2024 09:47:27 +0100
From: "Michael Walle" <michael@...le.cc>
To: "Marco Felsch" <m.felsch@...gutronix.de>,
<srinivas.kandagatla@...aro.org>, <gregkh@...uxfoundation.org>,
<miquel.raynal@...tlin.com>, <rafal@...ecki.pl>
Cc: <linux-kernel@...r.kernel.org>, <kernel@...gutronix.de>
Subject: Re: [RFC PATCH] nvmem: core: add sysfs cell write support
Hi,
On Thu Feb 15, 2024 at 10:14 PM CET, Marco Felsch wrote:
> @@ -432,6 +466,7 @@ static int nvmem_populate_sysfs_cells(struct nvmem_device *nvmem)
> struct bin_attribute **cells_attrs, *attrs;
> struct nvmem_cell_entry *entry;
> unsigned int ncells = 0, i = 0;
> + umode_t mode;
> int ret = 0;
>
> mutex_lock(&nvmem_mutex);
> @@ -456,15 +491,18 @@ static int nvmem_populate_sysfs_cells(struct nvmem_device *nvmem)
> goto unlock_mutex;
> }
>
> + mode = nvmem_bin_attr_get_umode(nvmem);
> +
> /* Initialize each attribute to take the name and size of the cell */
> list_for_each_entry(entry, &nvmem->cells, node) {
> sysfs_bin_attr_init(&attrs[i]);
> attrs[i].attr.name = devm_kasprintf(&nvmem->dev, GFP_KERNEL,
> "%s@%x", entry->name,
> entry->offset);
> - attrs[i].attr.mode = 0444;
cells are not writable if there is a read post process hook, see
__nvmem_cell_entry_write().
if (entry->read_post_processing)
mode &= ~0222;
-michael
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