On 09/06/2020 12:33, Jonathan Marek wrote:

On 6/9/20 5:52 AM, Srinivas Kandagatla wrote:

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On 08/06/2020 21:43, Jonathan Marek wrote:

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The driver may be used without slimbus, so don't depend on slimbus.

Signed-off-by: Jonathan Marek jonathan@marek.ca

drivers/soundwire/Kconfig | 1 -   drivers/soundwire/qcom.c  | 5 +++++   2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soundwire/Kconfig b/drivers/soundwire/Kconfig index fa2b4ab92ed9..d121cf739090 100644 --- a/drivers/soundwire/Kconfig +++ b/drivers/soundwire/Kconfig @@ -33,7 +33,6 @@ config SOUNDWIRE_INTEL   config SOUNDWIRE_QCOM       tristate "Qualcomm SoundWire Master driver" -    depends on SLIMBUS       depends on SND_SOC

Why not move this to imply SLIMBUS this will give more flexibility!

If you mean to change it to "select SLIMBUS", I'd prefer not to, because this would increase code size unnecessarily in my kernel.

imply is week select, which means that this driver can be built without SLIMBus selected. So removing reference to slimbus_bus is necessary in this case.

On the other hand, SLIMBus is going to be used sm8250 for BT audio, so this would not be unnecessary. Also mostly these are build as modules, so not sure why kernel size will increase here!

Am not 100% sure if SLIMBus will be kept on all SoCs, but keeping depends or imply in place would enforce or spell out some level of dependency on this.

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help         SoundWire Qualcomm Master driver. diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c index 14334442615f..ac81c64768ea 100644 --- a/drivers/soundwire/qcom.c +++ b/drivers/soundwire/qcom.c @@ -769,13 +769,18 @@ static int qcom_swrm_probe(struct platform_device *pdev)       if (!ctrl)           return -ENOMEM; +#ifdef CONFIG_SLIMBUS       if (dev->parent->bus == &slimbus_bus) { +#else +    if (false) { +#endif

May be you can do bit more cleanup here, which could endup like:

ctrl->regmap = dev_get_regmap(dev->parent, NULL); if (!ctrl->regmap) {      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);      if (res) {          ctrl->mmio = devm_ioremap_resource(dev, res);          if (IS_ERR(ctrl->mmio)) {              dev_err(dev, "No valid mem resource found\n");              return PTR_ERR(ctrl->mmio);          }

ctrl->reg_read = qcom_swrm_cpu_reg_read;          ctrl->reg_write = qcom_swrm_cpu_reg_write;      } else {          dev_err(dev, "No valid slim resource found\n");          return -EINVAL;      } } else {      ctrl->reg_read = qcom_swrm_ahb_reg_read;      ctrl->reg_write = qcom_swrm_ahb_reg_write; }

thanks, srini

I don't think this is better, it feels more obfuscated, and I think its possible we may end up with the mmio sdw having a parent with a regmap. (it is not how I did things up in my upstream stack, but in downstream the sdw nodes are inside the "macro" codec nodes)

I understand the '#ifdef CONFIG_SLIMBUS'/'dev->parent->bus == &slimbus_bus' is ugly, but at least its clear what's going on. Unless you have a better suggestion?

Other suggestion I had in my mind was to use compatible strings to get reg_read, reg_write callbacks + some flags like (if_type) populated. This can help looking up resources correctly.

Thanks, srini

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ctrl->reg_read = qcom_swrm_ahb_reg_read;           ctrl->reg_write = qcom_swrm_ahb_reg_write;           ctrl->regmap = dev_get_regmap(dev->parent, NULL);           if (!ctrl->regmap)               return -EINVAL;       } else {

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);           ctrl->reg_read = qcom_swrm_cpu_reg_read;