linux-kernel - Re: [PATCH v3 06/13] usb: typec: ucsi_ccg: Add cypress,firmware-build as a well-known regex

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Message-ID: <13b3d55d-29ac-1efa-fcf2-f3b7661ba199@nvidia.com>
Date:   Thu, 17 Nov 2022 19:45:44 +0000
From:   Jon Hunter <jonathanh@...dia.com>
To:     Wayne Chang <waynec@...dia.com>, gregkh@...uxfoundation.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        treding@...dia.com, thierry.reding@...il.com,
        heikki.krogerus@...ux.intel.com, ajayg@...dia.com,
        vkoul@...nel.org, p.zabel@...gutronix.de, balbi@...nel.org,
        mathias.nyman@...el.com, jckuo@...dia.com
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, singhanc@...dia.com,
        linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 06/13] usb: typec: ucsi_ccg: Add cypress,firmware-build
 as a well-known regex


On 14/11/2022 12:40, Wayne Chang wrote:
> ccgx is refer to the cypress cypd4226 typec controller.
> add cypress,firmware-build as a well-known regex.
> 
> 16-bit value is not sufficient for descriptiva names.
> Using string instead of u16 to make it more descriptive.
> 
> Signed-off-by: Wayne Chang <waynec@...dia.com>
> ---
> V2 -> V3:nothing has changed
> V1 -> V2:new change added for adding cypress,firmware-build
>   drivers/usb/typec/ucsi/ucsi_ccg.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
> index 139707a2f3d6..e412a457bbfc 100644
> --- a/drivers/usb/typec/ucsi/ucsi_ccg.c
> +++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
> @@ -1343,6 +1343,7 @@ static int ucsi_ccg_probe(struct i2c_client *client,
>   {
>   	struct device *dev = &client->dev;
>   	struct ucsi_ccg *uc;
> +	const char *of_fw_build;
>   	int status;
>   
>   	uc = devm_kzalloc(dev, sizeof(*uc), GFP_KERNEL);
> @@ -1363,6 +1364,17 @@ static int ucsi_ccg_probe(struct i2c_client *client,
>   	if (status)
>   		dev_err(uc->dev, "failed to get FW build information\n");
>   
> +	status = device_property_read_string(dev, "cypress,firmware-build",
> +					  &of_fw_build);
> +	if (!status) {
> +		if (!strcmp(of_fw_build, "nvidia,jetson-agx-xavier"))
> +			uc->fw_build = CCG_FW_BUILD_NVIDIA_TEGRA;
> +		else if (!strcmp(of_fw_build, "nvidia,gpu"))
> +			uc->fw_build = CCG_FW_BUILD_NVIDIA;
> +	} else {
> +		dev_err(uc->dev, "failed to get FW build information\n");
> +	}
> +

Instead of having the 'else' clause above, we should just ...

  if (!uc->fw_build)
          dev_err(uc->dev, "failed to get FW build information\n");

It is possible that status == 0, but the fw_build is not 
recognised/supported and so 'uc->fw_build' is not set.

Jon

-- 
nvpublic