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Subject: Re: [PATCH v11 11/12] soc: mediatek: cmdq: add
 cmdq_dev_get_client_reg function
From:   houlong wei <houlong.wei@mediatek.com>
To:     Bibby Hsieh <bibby.hsieh@mediatek.com>
CC:     Jassi Brar <jassisinghbrar@gmail.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Rob Herring <robh+dt@kernel.org>,
        CK Hu =?UTF-8?Q?=28=E8=83=A1=E4=BF=8A=E5=85=89=29?= 
        <ck.hu@mediatek.com>, "Daniel Kurtz" <djkurtz@chromium.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
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        <linux-arm-kernel@lists.infradead.org>,
        "linux-mediatek@lists.infradead.org" 
        <linux-mediatek@lists.infradead.org>,
        srv_heupstream <srv_heupstream@mediatek.com>,
        Sascha Hauer <kernel@pengutronix.de>,
        Philipp Zabel <p.zabel@pengutronix.de>,
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        <Yt.Shen@mediatek.com>,
        Daoyuan Huang =?UTF-8?Q?=28=E9=BB=83=E9=81=93=E5=8E=9F=29?= 
        <Daoyuan.Huang@mediatek.com>,
        Jiaguang Zhang =?UTF-8?Q?=28=E5=BC=A0=E5=8A=A0=E5=B9=BF=29?= 
        <Jiaguang.Zhang@mediatek.com>,
        Dennis-YC Hsieh =?UTF-8?Q?=28=E8=AC=9D=E5=AE=87=E5=93=B2=29?= 
        <Dennis-YC.Hsieh@mediatek.com>,
        Ginny Chen =?UTF-8?Q?=28=E9=99=B3=E6=B2=BB=E5=82=91=29?= 
        <ginny.chen@mediatek.com>, <houlong.wei@mediatek.com>
Date:   Sun, 11 Aug 2019 00:18:47 +0800
In-Reply-To: <20190729070106.9332-12-bibby.hsieh@mediatek.com>
References: <20190729070106.9332-1-bibby.hsieh@mediatek.com>
         <20190729070106.9332-12-bibby.hsieh@mediatek.com>
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On Mon, 2019-07-29 at 15:01 +0800, Bibby Hsieh 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@mediatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 29 ++++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  | 21 +++++++++++++++++++
>  2 files changed, 50 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 70ad4d806fac..9695b75cfc89 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -27,6 +27,35 @@ 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;
> +	int err;
> +
> +	if (!client_reg)
> +		return -ENOENT;
> +
> +	err = of_parse_phandle_with_fixed_args(dev->of_node,
> +					       "mediatek,gce-client-reg",
> +					       3, idx, &spec);
> +	if (err < 0) {
> +		dev_err(dev,
> +			"error %d can't parse gce-client-reg property (%d)",
> +			err, idx);
> +
> +		return err;
> +	}
> +
> +	client_reg->subsys = spec.args[0];
> +	client_reg->offset = spec.args[1];
> +	client_reg->size = spec.args[2];

Maybe we need add type conversion to avoid compiling warnings.
	client_reg->subsys = (u8)spec.args[0];
	client_reg->offset = (u16)spec.args[1];
	client_reg->size = (u16)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..be402c4c740e 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 +148,19 @@ 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
> + * @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);
> +

Could we keep the same order of function declaration and implementation?

>  #endif	/* __MTK_CMDQ_H__ */