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Message-ID: <20230405162307.s3fifzndgexifml6@mercury.elektranox.org>
Date: Wed, 5 Apr 2023 18:23:07 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
Miquel Raynal <miquel.raynal@...tlin.com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Wolfram Sang <wsa@...nel.org>, Mark Brown <broonie@...nel.org>,
Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 08/40] of: Rename of_modalias_node()
Hi,
On Tue, Apr 04, 2023 at 06:21:16PM +0100, Srinivas Kandagatla wrote:
> From: Miquel Raynal <miquel.raynal@...tlin.com>
>
> This helper does not produce a real modalias, but tries to get the
> "product" compatible part of the "vendor,product" compatibles only. It
> is far from creating a purely useful modalias string and does not seem
> to be used like that directly anyway, so let's try to give this helper a
> more meaningful name before moving there a real modalias helper (already
> existing under of/device.c).
>
> Also update the various documentations to refer to the strings as
> "aliases" rather than "modaliases" which has a real meaning in the Linux
> kernel.
>
> There is no functional change.
>
> Cc: Rafael J. Wysocki <rafael@...nel.org>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Sebastian Reichel <sre@...nel.org>
> Cc: Wolfram Sang <wsa@...nel.org>
> Cc: Mark Brown <broonie@...nel.org>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Acked-by: Mark Brown <broonie@...nel.org>
Acked-by: Sebastian Reichel <sre@...nel.org>
-- Sebastian
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
> drivers/acpi/bus.c | 7 ++++---
> drivers/gpu/drm/drm_mipi_dsi.c | 2 +-
> drivers/hsi/hsi_core.c | 2 +-
> drivers/i2c/busses/i2c-powermac.c | 2 +-
> drivers/i2c/i2c-core-of.c | 2 +-
> drivers/of/base.c | 18 +++++++++++-------
> drivers/spi/spi.c | 4 ++--
> include/linux/of.h | 3 ++-
> 8 files changed, 23 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 9531dd0fef50..fc74c786a867 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -817,9 +817,10 @@ static bool acpi_of_modalias(struct acpi_device *adev,
> * @modalias: Pointer to buffer that modalias value will be copied into
> * @len: Length of modalias buffer
> *
> - * This is a counterpart of of_modalias_node() for struct acpi_device objects.
> - * If there is a compatible string for @adev, it will be copied to @modalias
> - * with the vendor prefix stripped; otherwise, @default_id will be used.
> + * This is a counterpart of of_alias_from_compatible() for struct acpi_device
> + * objects. If there is a compatible string for @adev, it will be copied to
> + * @modalias with the vendor prefix stripped; otherwise, @default_id will be
> + * used.
> */
> void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
> char *modalias, size_t len)
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index b41aaf2bb9f1..b62f5e4425f4 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -160,7 +160,7 @@ of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
> int ret;
> u32 reg;
>
> - if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
> + if (of_alias_from_compatible(node, info.type, sizeof(info.type)) < 0) {
> drm_err(host, "modalias failure on %pOF\n", node);
> return ERR_PTR(-EINVAL);
> }
> diff --git a/drivers/hsi/hsi_core.c b/drivers/hsi/hsi_core.c
> index 8fda8f1d064d..acbf82f755a8 100644
> --- a/drivers/hsi/hsi_core.c
> +++ b/drivers/hsi/hsi_core.c
> @@ -207,7 +207,7 @@ static void hsi_add_client_from_dt(struct hsi_port *port,
> if (!cl)
> return;
>
> - err = of_modalias_node(client, name, sizeof(name));
> + err = of_alias_from_compatible(client, name, sizeof(name));
> if (err)
> goto err;
>
> diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
> index 2e74747eec9c..ec706a3aba26 100644
> --- a/drivers/i2c/busses/i2c-powermac.c
> +++ b/drivers/i2c/busses/i2c-powermac.c
> @@ -284,7 +284,7 @@ static bool i2c_powermac_get_type(struct i2c_adapter *adap,
> */
>
> /* First try proper modalias */
> - if (of_modalias_node(node, tmp, sizeof(tmp)) >= 0) {
> + if (of_alias_from_compatible(node, tmp, sizeof(tmp)) >= 0) {
> snprintf(type, type_size, "MAC,%s", tmp);
> return true;
> }
> diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
> index bce6b796e04c..8941a30574e3 100644
> --- a/drivers/i2c/i2c-core-of.c
> +++ b/drivers/i2c/i2c-core-of.c
> @@ -27,7 +27,7 @@ int of_i2c_get_board_info(struct device *dev, struct device_node *node,
>
> memset(info, 0, sizeof(*info));
>
> - if (of_modalias_node(node, info->type, sizeof(info->type)) < 0) {
> + if (of_alias_from_compatible(node, info->type, sizeof(info->type)) < 0) {
> dev_err(dev, "of_i2c: modalias failure on %pOF\n", node);
> return -EINVAL;
> }
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index ac6fde53342f..161fe3192c46 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -1208,19 +1208,23 @@ struct device_node *of_find_matching_node_and_match(struct device_node *from,
> EXPORT_SYMBOL(of_find_matching_node_and_match);
>
> /**
> - * of_modalias_node - Lookup appropriate modalias for a device node
> + * of_alias_from_compatible - Lookup appropriate alias for a device node
> + * depending on compatible
> * @node: pointer to a device tree node
> - * @modalias: Pointer to buffer that modalias value will be copied into
> - * @len: Length of modalias value
> + * @alias: Pointer to buffer that alias value will be copied into
> + * @len: Length of alias value
> *
> * Based on the value of the compatible property, this routine will attempt
> - * to choose an appropriate modalias value for a particular device tree node.
> + * to choose an appropriate alias value for a particular device tree node.
> * It does this by stripping the manufacturer prefix (as delimited by a ',')
> * from the first entry in the compatible list property.
> *
> + * Note: The matching on just the "product" side of the compatible is a relic
> + * from I2C and SPI. Please do not add any new user.
> + *
> * Return: This routine returns 0 on success, <0 on failure.
> */
> -int of_modalias_node(struct device_node *node, char *modalias, int len)
> +int of_alias_from_compatible(const struct device_node *node, char *alias, int len)
> {
> const char *compatible, *p;
> int cplen;
> @@ -1229,10 +1233,10 @@ int of_modalias_node(struct device_node *node, char *modalias, int len)
> if (!compatible || strlen(compatible) > cplen)
> return -ENODEV;
> p = strchr(compatible, ',');
> - strscpy(modalias, p ? p + 1 : compatible, len);
> + strscpy(alias, p ? p + 1 : compatible, len);
> return 0;
> }
> -EXPORT_SYMBOL_GPL(of_modalias_node);
> +EXPORT_SYMBOL_GPL(of_alias_from_compatible);
>
> /**
> * of_find_node_by_phandle - Find a node given a phandle
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 44b85a8d47f1..3bbdc5fe3b99 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -2354,8 +2354,8 @@ of_register_spi_device(struct spi_controller *ctlr, struct device_node *nc)
> }
>
> /* Select device driver */
> - rc = of_modalias_node(nc, spi->modalias,
> - sizeof(spi->modalias));
> + rc = of_alias_from_compatible(nc, spi->modalias,
> + sizeof(spi->modalias));
> if (rc < 0) {
> dev_err(&ctlr->dev, "cannot find modalias for %pOF\n", nc);
> goto err_out;
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 0af611307db2..b1eea8569043 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -373,7 +373,8 @@ extern int of_n_addr_cells(struct device_node *np);
> extern int of_n_size_cells(struct device_node *np);
> extern const struct of_device_id *of_match_node(
> const struct of_device_id *matches, const struct device_node *node);
> -extern int of_modalias_node(struct device_node *node, char *modalias, int len);
> +extern int of_alias_from_compatible(const struct device_node *node, char *alias,
> + int len);
> extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
> extern int __of_parse_phandle_with_args(const struct device_node *np,
> const char *list_name, const char *cells_name, int cell_count,
> --
> 2.25.1
>
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