linux-kernel - Re: [PATCH 5/7] phy: qcom: Add M31 based eUSB2 PHY driver

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Message-ID: <9ea186e39afb4584f12758d2fa6a26a0b12389ec.camel@pengutronix.de>
Date: Thu, 16 Jan 2025 09:45:58 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Melody Olvera <quic_molvera@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
  Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Wesley Cheng <quic_wcheng@...cinc.com>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>,  Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Bjorn Andersson
 <andersson@...nel.org>,  Konrad Dybcio <konradybcio@...nel.org>, Satya
 Durga Srinivasu Prabhala <quic_satyap@...cinc.com>, Trilok Soni
 <quic_tsoni@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 5/7] phy: qcom: Add M31 based eUSB2 PHY driver

On Mo, 2025-01-13 at 13:52 -0800, Melody Olvera wrote:
> From: Wesley Cheng <quic_wcheng@...cinc.com>
> 
> On SM8750, the eUSB2 PHY used is M31 based. Add the initialization
> sequences to bring it out of reset, and to initialize the associated eUSB2
> repeater as well.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
> ---
>  drivers/phy/qualcomm/Kconfig              |  12 +-
>  drivers/phy/qualcomm/Makefile             |   1 +
>  drivers/phy/qualcomm/phy-qcom-m31-eusb2.c | 269 ++++++++++++++++++++++++++++++
>  3 files changed, 281 insertions(+), 1 deletion(-)
> 
[...]
> diff --git a/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..e15529673e358db914936a60fa605c872cd2511a
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
> @@ -0,0 +1,269 @@
[...]
> +static int m31eusb2_phy_probe(struct platform_device *pdev)
> +{
> +	struct phy_provider *phy_provider;
> +	const struct m31_eusb2_priv_data *data;
> +	struct device *dev = &pdev->dev;
> +	struct m31eusb2_phy *phy;
> +
> +	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> +	if (!phy)
> +		return -ENOMEM;
> +
> +	data = of_device_get_match_data(dev);
> +	if (IS_ERR(data))
> +		return -EINVAL;
> +	phy->data = data;
> +
> +	phy->base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(phy->base))
> +		return PTR_ERR(phy->base);
> +
> +	phy->reset = devm_reset_control_get_exclusive_by_index(dev, 0);

The dt-bindings only specify a single reset, so there is no need to
request by index. Just use
	phy->reset = devm_reset_control_get_exclusive(dev, NULL);

regards
Philipp