linux-kernel - Re: [PATCH v2 1/4] remoteproc: Introduce rproc_of_parse

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Message-ID: <20200602193730.GA29840@xps15>
Date:   Tue, 2 Jun 2020 13:37:30 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Lokesh Vutla <lokeshvutla@...com>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] remoteproc: Introduce rproc_of_parse_firmware()
 helper

On Wed, May 20, 2020 at 07:10:03PM -0500, Suman Anna wrote:
> Add a new helper function rproc_of_parse_firmware() to the remoteproc
> core that can be used by various remoteproc drivers to look up the
> the "firmware-name" property from a rproc device node. This property
> is already being used by multiple drivers, so this helper can avoid
> repeating equivalent code in remoteproc drivers.
> 
> Signed-off-by: Suman Anna <s-anna@...com>
> ---
> v2: New patch
> 
>  drivers/remoteproc/remoteproc_core.c     | 23 +++++++++++++++++++++++
>  drivers/remoteproc/remoteproc_internal.h |  2 ++
>  2 files changed, 25 insertions(+)
> 

Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>

> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 9f04c30c4aaf..c458b218d524 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1034,6 +1034,29 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
>  }
>  EXPORT_SYMBOL(rproc_of_resm_mem_entry_init);
>  
> +/**
> + * rproc_of_parse_firmware() - parse and return the firmware-name
> + * @dev: pointer on device struct representing a rproc
> + * @index: index to use for the firmware-name retrieval
> + * @fw_name: pointer to a character string, in which the firmware
> + *           name is returned on success and unmodified otherwise.
> + *
> + * This is an OF helper function that parses a device's DT node for
> + * the "firmware-name" property and returns the firmware name pointer
> + * in @fw_name on success.
> + *
> + * Return: 0 on success, or an appropriate failure.
> + */
> +int rproc_of_parse_firmware(struct device *dev, int index, const char **fw_name)
> +{
> +	int ret;
> +
> +	ret = of_property_read_string_index(dev->of_node, "firmware-name",
> +					    index, fw_name);
> +	return ret ? ret : 0;
> +}
> +EXPORT_SYMBOL(rproc_of_parse_firmware);
> +
>  /*
>   * A lookup table for resource handlers. The indices are defined in
>   * enum fw_resource_type.
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index 4ba7cb59d3e8..e5341e91d2fc 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -28,6 +28,8 @@ struct rproc_debug_trace {
>  void rproc_release(struct kref *kref);
>  irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
>  void rproc_vdev_release(struct kref *ref);
> +int rproc_of_parse_firmware(struct device *dev, int index,
> +			    const char **fw_name);
>  
>  /* from remoteproc_virtio.c */
>  int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
> -- 
> 2.26.0
>