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Date:   Mon, 12 Sep 2022 14:23:21 -0700
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Subject: Re: [PATCH 1/4] thermal: qcom: qmi_cooling: Add skeletal qmi cooling
 driver
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To:     Bhupesh Sharma <bhupesh.sharma@linaro.org>,
        <linux-kernel@vger.kernel.org>, <linux-pm@vger.kernel.org>,
        <devicetree@vger.kernel.org>
CC:     <agross@kernel.org>, <linux-arm-msm@vger.kernel.org>,
        <daniel.lezcano@linaro.org>, <robh@kernel.org>,
        <andersson@kernel.org>, <rafael@kernel.org>,
        <bhupesh.linux@gmail.com>
References: <20220912085049.3517140-1-bhupesh.sharma@linaro.org>
 <20220912085049.3517140-2-bhupesh.sharma@linaro.org>
From:   Jeff Johnson <quic_jjohnson@quicinc.com>
In-Reply-To: <20220912085049.3517140-2-bhupesh.sharma@linaro.org>
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On 9/12/2022 1:50 AM, Bhupesh Sharma wrote:
> Add a skeleton driver for supporting Qualcomm QMI thermal mitigation
> (TMD) cooling devices.
> 
> The QMI TMD cooling devices are used for various mitigations for
> remote subsystem(s) including remote processor mitigation, rail
> voltage restriction etc. This driver uses kernel QMI interface
> to send the message to remote subsystem(s).
> 
> Each child node of the QMI TMD devicetree node should represent
> each remote subsystem and each child of this subsystem represents
> separate cooling devices.
> 
> Cc: daniel.lezcano@linaro.org
> Cc: rafael@kernel.org
> Cc: andersson@kernel.org
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
> ---
>   .../qcom/qmi_cooling/qcom_qmi_cooling.c       | 632 ++++++++++++++++++
>   .../qcom/qmi_cooling/qcom_tmd_services.c      | 352 ++++++++++
>   .../qcom/qmi_cooling/qcom_tmd_services.h      | 120 ++++
>   3 files changed, 1104 insertions(+)
>   create mode 100644 drivers/thermal/qcom/qmi_cooling/qcom_qmi_cooling.c
>   create mode 100644 drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.c
>   create mode 100644 drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.h
> 
> diff --git a/drivers/thermal/qcom/qmi_cooling/qcom_qmi_cooling.c b/drivers/thermal/qcom/qmi_cooling/qcom_qmi_cooling.c
> new file mode 100644
> index 000000000000..4cb601533b9d
> --- /dev/null
> +++ b/drivers/thermal/qcom/qmi_cooling/qcom_qmi_cooling.c

[snip]

> +static char device_clients[][QMI_CLIENT_NAME_LENGTH] = {

can/should this be const?
can/should this use designated initializers?

> +	{"pa"},
> +	{"pa_fr1"},
> +	{"cx_vdd_limit"},
> +	{"modem"},
> +	{"modem_current"},
> +	{"modem_skin"},

[snip]

> diff --git a/drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.c b/drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.c
> new file mode 100644
> index 000000000000..5b950b8952f0
> --- /dev/null
> +++ b/drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.c
> @@ -0,0 +1,352 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2022, Linaro Limited
> + */
> +
> +#include <linux/soc/qcom/qmi.h>
> +
> +#include "qcom_tmd_services.h"
> +
> +static struct qmi_elem_info tmd_mitigation_dev_id_type_v01_ei[] = {

note that commit ff6d365898d ("soc: qcom: qmi: use const for struct
qmi_elem_info") allows QMI message encoding/decoding rules to be const

<https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=ff6d365898d4d31bd557954c7fc53f38977b491c>

I'm waiting for that to land in the soc tree before I submit my changes 
to all of the existing drivers, but you can do this now for the new driver

> +	{
> +		.data_type      = QMI_STRING,
> +		.elem_len       = QMI_TMD_MITIGATION_DEV_ID_LENGTH_MAX_V01 + 1,
> +		.elem_size      = sizeof(char),
> +		.array_type     = NO_ARRAY,
> +		.tlv_type       = 0,
> +		.offset         = offsetof(
> +					struct tmd_mitigation_dev_id_type_v01,
> +					mitigation_dev_id),
> +	},
> +	{
> +		.data_type      = QMI_EOTI,
> +		.array_type     = NO_ARRAY,
> +		.tlv_type       = QMI_COMMON_TLV_TYPE,
> +	},
> +};

[snip]

> diff --git a/drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.h b/drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.h
> new file mode 100644
> index 000000000000..8af0bfd7eb48
> --- /dev/null
> +++ b/drivers/thermal/qcom/qmi_cooling/qcom_tmd_services.h

[snip]

> +extern struct qmi_elem_info tmd_get_mitigation_device_list_req_msg_v01_ei[];

don't forget to make the externs const as well