linux-kernel - Re: [PATCH v1 1/1] nvmem: qcom-spmi-sdam: Enable multiple devices

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Date:   Mon, 20 Jul 2020 09:49:22 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Guru Das Srinagesh <gurus@...eaurora.org>,
        linux-arm-msm@...r.kernel.org
Cc:     Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] nvmem: qcom-spmi-sdam: Enable multiple devices



On 14/07/2020 01:01, Guru Das Srinagesh wrote:
> Specifying the name of the nvmem device while registering it with the
> nvmem framework has the side effect of causing the second instance of a
> device using this driver to fail probe with the following error message:
> 
>    sysfs: cannot create duplicate filename '/bus/nvmem/devices/spmi_sdam'
> 
> Removing the name allows the nvmem framework to assign a monotonically
> increasing integer id to each instance of this driver automatically,
> like so:
> 
>    /sys/bus/nvmem/devices # ls
>    nvmem0  nvmem1  nvmem2
> 
> Signed-off-by: Guru Das Srinagesh <gurus@...eaurora.org>
> ---
>   drivers/nvmem/qcom-spmi-sdam.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/nvmem/qcom-spmi-sdam.c b/drivers/nvmem/qcom-spmi-sdam.c
> index 8682cda..6275f14 100644
> --- a/drivers/nvmem/qcom-spmi-sdam.c
> +++ b/drivers/nvmem/qcom-spmi-sdam.c
> @@ -1,6 +1,6 @@
>   // SPDX-License-Identifier: GPL-2.0-only
>   /*
> - * Copyright (c) 2017 The Linux Foundation. All rights reserved.
> + * Copyright (c) 2017, 2020 The Linux Foundation. All rights reserved.
>    */
>   
>   #include <linux/device.h>
> @@ -140,8 +140,6 @@ static int sdam_probe(struct platform_device *pdev)
>   	sdam->size = val * 32;
>   
>   	sdam->sdam_config.dev = &pdev->dev;
> -	sdam->sdam_config.name = "spmi_sdam";
> -	sdam->sdam_config.id = pdev->id;

Please use new flag NVMEM_DEVID_AUTO introduced in 
https://git.kernel.org/pub/scm/linux/kernel/git/srini/nvmem.git/commit/?h=for-next&id=93ac5fdba1eddc679e9694b64f2fa321317df988 
  instead of pdev->id, which should fix the issue.

--srini

>   	sdam->sdam_config.owner = THIS_MODULE,
>   	sdam->sdam_config.stride = 1;
>   	sdam->sdam_config.word_size = 1;
>