linux-kernel - Re: [PATCH 2/5] soundwire: qcom: add support for mmio soundwire devices

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Message-ID: <20200609043420.GA1084979@vkoul-mobl>
Date:   Tue, 9 Jun 2020 10:04:20 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     alsa-devel@...a-project.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] soundwire: qcom: add support for mmio soundwire
 devices

Hi Jonathan,

On 08-06-20, 16:43, Jonathan Marek wrote:
> Adds support for qcom soundwire devices with memory mapped IO registers.

Please use 'SoundWire Master devices' instead :)

> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  drivers/soundwire/qcom.c | 25 +++++++++++++++++++++++--
>  1 file changed, 23 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index f38d1fd3679f..628747df1c75 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -90,6 +90,7 @@ struct qcom_swrm_ctrl {
>  	struct sdw_bus bus;
>  	struct device *dev;
>  	struct regmap *regmap;
> +	void __iomem *mmio;
>  	struct completion *comp;
>  	struct work_struct slave_work;
>  	/* read/write lock */
> @@ -154,6 +155,20 @@ static int qcom_swrm_ahb_reg_write(struct qcom_swrm_ctrl *ctrl,
>  	return SDW_CMD_OK;
>  }
>  
> +static int qcom_swrm_cpu_reg_read(struct qcom_swrm_ctrl *ctrl, int reg,
> +				  u32 *val)
> +{
> +	*val = readl(ctrl->mmio + reg);
> +	return SDW_CMD_OK;
> +}
> +
> +static int qcom_swrm_cpu_reg_write(struct qcom_swrm_ctrl *ctrl, int reg,
> +				   int val)
> +{
> +	writel(val, ctrl->mmio + reg);
> +	return SDW_CMD_OK;
> +}

this looks fine but regmap supports mmio also, so I am thinking we
should remove these and set regmap (mmio/slim)... Srini..?

-- 
~Vinod