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SubjectRe: [PATCH 2/5] soundwire: qcom: add support for mmio soundwire devices
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On 08/06/2020 21:43, Jonathan Marek wrote:
> Adds support for qcom soundwire devices with memory mapped IO registers.
>
> Signed-off-by: Jonathan Marek <jonathan@marek.ca>
> ---

In general patch itself looks pretty trivial, but I would like to see
what 1.5.1 controller provides in terms of error reporting of SoundWire
slave register reads/writes. On WCD based controller we did not have a
mechanism to report things like if the read is ignored or not. I was
hoping that this version of controller would be able to report that.

I will be nice to those patches if that is something which is supported
in this version.

--srini

> 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;
> +}
> +
> static int qcom_swrm_cmd_fifo_wr_cmd(struct qcom_swrm_ctrl *ctrl, u8 cmd_data,
> u8 dev_addr, u16 reg_addr)
> {
> @@ -746,6 +761,7 @@ static int qcom_swrm_probe(struct platform_device *pdev)
> struct sdw_master_prop *prop;
> struct sdw_bus_params *params;
> struct qcom_swrm_ctrl *ctrl;
> + struct resource *res;
> int ret;
> u32 val;
>
> @@ -760,8 +776,13 @@ static int qcom_swrm_probe(struct platform_device *pdev)
> if (!ctrl->regmap)
> return -EINVAL;
> } else {
> - /* Only WCD based SoundWire controller is supported */
> - return -ENOTSUPP;
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +
> + ctrl->reg_read = qcom_swrm_cpu_reg_read;
> + ctrl->reg_write = qcom_swrm_cpu_reg_write;
> + ctrl->mmio = devm_ioremap_resource(dev, res);
> + if (IS_ERR(ctrl->mmio))
> + return PTR_ERR(ctrl->mmio);
> }
>
> ctrl->irq = of_irq_get(dev->of_node, 0);
>

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