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Subject: Re: [PATCH 1/2] soc: qcom: aoss: Expose send for generic usecase
To:     Sibi Sankar <sibis@codeaurora.org>
Cc:     bjorn.andersson@linaro.org, agross@kernel.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
References: <1604373541-12641-1-git-send-email-clew@codeaurora.org>
 <3ae3e00dd8a6c2aacd852fca1f343779@codeaurora.org>
From:   Chris Lew <clew@codeaurora.org>
Message-ID: <2d10c46c-19b9-d1c1-04b9-531570edd446@codeaurora.org>
Date:   Tue, 17 Nov 2020 11:52:37 -0800
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On 11/11/2020 10:33 AM, Sibi Sankar wrote:
> Hey Chris,
> Thanks for the patch.
> 
> On 2020-11-03 08:49, Chris Lew wrote:
>> Not all upcoming usecases will have an interface to allow the aoss
>> driver to hook onto. Expose the send api and create a get function to
>> enable drivers to send their own messages to aoss.
>>
>> Signed-off-by: Chris Lew <clew@codeaurora.org>
>> ---
>>  drivers/soc/qcom/qcom_aoss.c       | 28 +++++++++++++++++++++++++++-
>>  include/linux/soc/qcom/qcom_aoss.h | 33 
>> +++++++++++++++++++++++++++++++++
>>  2 files changed, 60 insertions(+), 1 deletion(-)
>>  create mode 100644 include/linux/soc/qcom/qcom_aoss.h
>>
>> diff --git a/drivers/soc/qcom/qcom_aoss.c b/drivers/soc/qcom/qcom_aoss.c
>> index ed2c687c16b3..8f052db1880a 100644
>> --- a/drivers/soc/qcom/qcom_aoss.c
>> +++ b/drivers/soc/qcom/qcom_aoss.c
>> @@ -8,10 +8,12 @@
>>  #include <linux/io.h>
>>  #include <linux/mailbox_client.h>
>>  #include <linux/module.h>
>> +#include <linux/of_platform.h>
>>  #include <linux/platform_device.h>
>>  #include <linux/pm_domain.h>
>>  #include <linux/thermal.h>
>>  #include <linux/slab.h>
>> +#include <linux/soc/qcom/qcom_aoss.h>
>>
>>  #define QMP_DESC_MAGIC            0x0
>>  #define QMP_DESC_VERSION        0x4
>> @@ -222,12 +224,15 @@ static bool qmp_message_empty(struct qmp *qmp)
>>   *
>>   * Return: 0 on success, negative errno on failure
>>   */
>> -static int qmp_send(struct qmp *qmp, const void *data, size_t len)
>> +int qmp_send(struct qmp *qmp, const void *data, size_t len)
>>  {
>>      long time_left;
>>      size_t tlen;
>>      int ret;
>>
>> +    if (!qmp || !data)
>> +        return -EINVAL;
>> +
>>      if (WARN_ON(len + sizeof(u32) > qmp->size))
>>          return -EINVAL;
>>
>> @@ -261,6 +266,7 @@ static int qmp_send(struct qmp *qmp, const void
>> *data, size_t len)
>>
>>      return ret;
>>  }
>> +EXPORT_SYMBOL_GPL(qmp_send);
>>
>>  static int qmp_qdss_clk_prepare(struct clk_hw *hw)
>>  {
>> @@ -515,6 +521,26 @@ static void qmp_cooling_devices_remove(struct qmp 
>> *qmp)
>>          thermal_cooling_device_unregister(qmp->cooling_devs[i].cdev);
>>  }
>>
>> +/**
>> + * qmp_get() - get a qmp handle from device tree node
>> + * @np: of node of qmp device
>> + *
>> + * Return: handle to qmp device on success, ERR_PTR() on failure
>> + */
>> +struct qmp_device *qmp_get(struct device_node *np)
>> +{
>> +    struct platform_device *pdev;
>> +    struct qmp *qmp;
> 
> Can we use this patch series to determine
> the binding the client are expected to use
> to point to the qmp phandle and have it
> parsed here? This would mean that qmp_get
> would take in device as input instead.
> Bjorn suggested that clients use "qcom,qmp"
> during an offline discussion. Let me know
> what you think.
> 

Hey Sibi,

Yea I think that's a better implementation. I'll upload a second 
revision using "qcom,qmp" as the binding.

>> +
>> +    pdev = of_find_device_by_node(np);
>> +    if (!pdev)
>> +        return ERR_PTR(-EINVAL);
>> +
>> +    qmp = platform_get_drvdata(pdev);
>> +    return qmp ? qmp : ERR_PTR(-EPROBE_DEFER);
>> +}
>> +EXPORT_SYMBOL_GPL(qmp_get);
>> +
>>  static int qmp_probe(struct platform_device *pdev)
>>  {
>>      struct resource *res;
>> diff --git a/include/linux/soc/qcom/qcom_aoss.h
>> b/include/linux/soc/qcom/qcom_aoss.h
>> new file mode 100644
>> index 000000000000..05fc0ed3a10d
>> --- /dev/null
>> +++ b/include/linux/soc/qcom/qcom_aoss.h
>> @@ -0,0 +1,33 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/*
>> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
>> + */
>> +
>> +#ifndef __QCOM_AOSS_H__
>> +#define __QCOM_AOSS_H__
>> +
>> +#include <linux/err.h>
>> +#include <linux/of.h>
>> +
>> +struct qmp;
>> +
>> +#if IS_ENABLED(CONFIG_QCOM_AOSS_QMP)
>> +
>> +int qmp_send(struct qmp *qmp, const void *data, size_t len);
>> +struct qmp_device *qmp_get(struct device_node *np);
>> +
>> +#else
>> +
>> +int qmp_send(struct qmp *qmp, const void *data, size_t len)
>> +{
>> +    return -ENODEV;
>> +}
>> +
>> +struct qmp *qmp_get(struct device_node *np)
>> +{
>> +    return ERR_PTR(-ENODEV);
>> +}
>> +
>> +#endif
>> +
>> +#endif
> 

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