linux-kernel - Re: [PATCH v5 16/22] crypto: qce: core: Make clocks optional

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Date:   Mon, 15 Nov 2021 12:06:32 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org,
        bhupesh.linux@...il.com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org, agross@...nel.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        stephan@...hold.net, Thara Gopinath <thara.gopinath@...aro.org>
Subject: Re: [PATCH v5 16/22] crypto: qce: core: Make clocks optional

On Wed 10 Nov 04:59 CST 2021, Bhupesh Sharma wrote:

> From: Thara Gopinath <thara.gopinath@...aro.org>
> 
> On certain Snapdragon processors, the crypto engine clocks are enabled by
> default by security firmware and the driver need not/ should not handle the
> clocks. Make acquiring of all the clocks optional in crypto engine driver
> so that the driver initializes properly even if no clocks are specified in
> the dt.
> 

So on some Snapdragons we don't have clocks, on others failing to
specify the clock leads to hard-to-debug issues. Can we make the clk_get
calls conditional based on the compatible instead?

> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> [Massage the commit log]

It's a good habit to prefix these messages with your name, i.e.
[Bhupesh: Massaged the commit log]

Regards,
Bjorn

> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
>  drivers/crypto/qce/core.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
> index dd2604f5ce6a..98784d63d78c 100644
> --- a/drivers/crypto/qce/core.c
> +++ b/drivers/crypto/qce/core.c
> @@ -213,19 +213,19 @@ static int qce_crypto_probe(struct platform_device *pdev)
>  	if (IS_ERR(qce->mem_path))
>  		return PTR_ERR(qce->mem_path);
>  
> -	qce->core = devm_clk_get(qce->dev, "core");
> +	qce->core = devm_clk_get_optional(qce->dev, "core");
>  	if (IS_ERR(qce->core)) {
>  		ret = PTR_ERR(qce->core);
>  		goto err;
>  	}
>  
> -	qce->iface = devm_clk_get(qce->dev, "iface");
> +	qce->iface = devm_clk_get_optional(qce->dev, "iface");
>  	if (IS_ERR(qce->iface)) {
>  		ret = PTR_ERR(qce->iface);
>  		goto err;
>  	}
>  
> -	qce->bus = devm_clk_get(qce->dev, "bus");
> +	qce->bus = devm_clk_get_optional(qce->dev, "bus");
>  	if (IS_ERR(qce->bus)) {
>  		ret = PTR_ERR(qce->bus);
>  		goto err;
> -- 
> 2.31.1
>