Re: [PATCH v5 3/5] soc: qcom: smem: introduce qcom_smem_get_soc_id()

[Kathiravan T]

On 5/27/2023 2:18 AM, Robert Marko wrote:
> Introduce a helper to return the SoC SMEM ID, which is used to identify the
> exact SoC model as there may be differences in the same SoC family.
>
> Currently, cpufreq-nvmem does this completely in the driver and there has
> been more interest expresed for other drivers to use this information so
> lets expose a common helper to prevent redoing it in individual drivers
> since this field is present on every SMEM table version.


LGTM,

Reviewed-by: Kathiravan T <quic_kathirav@xxxxxxxxxxx>


> Signed-off-by: Robert Marko <robimarko@xxxxxxxxx>
> ---
> Changes in v5:
> * Convert the __le32 ID to CPU endinaness
>
> Changes in v4:
> * Change helper name to qcom_smem_get_soc_id()
> * Remove len and just pass NULL, that is sufficient here
>
> Changes in v3:
> * Change export to EXPORT_SYMBOL_GPL
> * Use an argument for returning SoC ID
> * Update kerneldoc
> ---
>   drivers/soc/qcom/smem.c       | 23 +++++++++++++++++++++++
>   include/linux/soc/qcom/smem.h |  2 ++
>   2 files changed, 25 insertions(+)
>
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index bc98520c4969..b0d59e815c3b 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -14,6 +14,7 @@
>   #include <linux/sizes.h>
>   #include <linux/slab.h>
>   #include <linux/soc/qcom/smem.h>
> +#include <linux/soc/qcom/socinfo.h>
>   
>   /*
>    * The Qualcomm shared memory system is a allocate only heap structure that
> @@ -772,6 +773,28 @@ phys_addr_t qcom_smem_virt_to_phys(void *p)
>   }
>   EXPORT_SYMBOL_GPL(qcom_smem_virt_to_phys);
>   
> +/**
> + * qcom_smem_get_soc_id() - return the SoC ID
> + * @id:	On success, we return the SoC ID here.
> + *
> + * Look up SoC ID from HW/SW build ID and return it.
> + *
> + * Return: 0 on success, negative errno on failure.
> + */
> +int qcom_smem_get_soc_id(u32 *id)
> +{
> +	struct socinfo *info;
> +
> +	info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL);
> +	if (IS_ERR(info))
> +		return PTR_ERR(info);
> +
> +	*id = __le32_to_cpu(info->id);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_smem_get_soc_id);
> +
>   static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
>   {
>   	struct smem_header *header;
> diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
> index 86e1b358688a..223db6a9c733 100644
> --- a/include/linux/soc/qcom/smem.h
> +++ b/include/linux/soc/qcom/smem.h
> @@ -11,4 +11,6 @@ int qcom_smem_get_free_space(unsigned host);
>   
>   phys_addr_t qcom_smem_virt_to_phys(void *p);
>   
> +int qcom_smem_get_soc_id(u32 *id);
> +
>   #endif