linux-kernel - Re: [PATCH v8 11/12] soc: mediatek: cmdq: add cmdq_dev_get_client

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Message-ID: <CANMq1KDWOr8f6nx7CS9Z_0OCwZFSTxaAT=333xXE-R5FJfEyfg@mail.gmail.com>
Date:   Fri, 14 Jun 2019 16:31:26 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, CK HU <ck.hu@...iatek.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        YT Shen <yt.shen@...iatek.com>,
        Daoyuan Huang <daoyuan.huang@...iatek.com>,
        Jiaguang Zhang <jiaguang.zhang@...iatek.com>,
        Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>, ginny.chen@...iatek.com
Subject: Re: [PATCH v8 11/12] soc: mediatek: cmdq: add cmdq_dev_get_client_reg function

On Wed, Jun 12, 2019 at 4:53 PM Bibby Hsieh <bibby.hsieh@...iatek.com> wrote:
>
> GCE cannot know the register base address, this function
> can help cmdq client to get the cmdq_client_reg structure.
>
> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 24 ++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  | 20 ++++++++++++++++++++
>  2 files changed, 44 insertions(+)
>
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 70ad4d806fac..fac4d33fd520 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -27,6 +27,30 @@ struct cmdq_instruction {
>         u8 op;
>  };
>
> +int cmdq_dev_get_client_reg(struct device *dev,
> +                           struct cmdq_client_reg *client_reg, int idx)
> +{
> +       struct of_phandle_args spec;
> +
> +       if (!client_reg)
> +               return -EINVAL;
> +
> +       if (of_parse_phandle_with_args(dev->of_node, "mediatek,gce-client-reg",
> +                                      "#subsys-cells", idx, &spec)) {
> +               dev_err(dev, "can't parse gce-client-reg property (%d)", idx);
> +
> +               return -EINVAL;
> +       }
> +
> +       client_reg->subsys = spec.args[0];
> +       client_reg->offset = spec.args[1];
> +       client_reg->size = spec.args[2];
> +       of_node_put(spec.np);
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(cmdq_dev_get_client_reg);
> +
>  static void cmdq_client_timeout(struct timer_list *t)
>  {
>         struct cmdq_client *client = from_timer(client, t, timer);
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index a345870a6d10..2e2a2274c231 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -15,6 +15,12 @@
>
>  struct cmdq_pkt;
>
> +struct cmdq_client_reg {
> +       u8 subsys;
> +       u16 offset;
> +       u16 size;
> +};
> +
>  struct cmdq_client {
>         spinlock_t lock;
>         u32 pkt_cnt;
> @@ -142,4 +148,18 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
>   */
>  int cmdq_pkt_flush(struct cmdq_pkt *pkt);
>
> +/**
> + * cmdq_dev_get_client_reg() - parse cmdq client reg from the device node of CMDQ client

Minor nit: this line is over 80 chars.

> + * @dev:       device of CMDQ mailbox clienti
> + * @client_reg: CMDQ client reg pointer
> + * @idx:       the index of desired reg
> + *
> + * Return: 0 for success; else the error code is returned
> + *
> + * Help CMDQ client pasing the cmdq client reg
> + * from the device node of CMDQ client.
> + */
> +int cmdq_dev_get_client_reg(struct device *dev,
> +                           struct cmdq_client_reg *client_reg, int idx);
> +
>  #endif /* __MTK_CMDQ_H__ */
> --
> 2.18.0
>