linux-kernel - Re: [PATCH V8 02/12] phy: freescale: add Samsung HDMI PHY

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Date: Tue, 6 Feb 2024 18:35:17 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Adam Ford <aford173@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org, marex@...x.de,
 alexander.stein@...tq-group.com, frieder.schrempf@...tron.de, Lucas Stach
 <l.stach@...gutronix.de>, Andrzej Hajda <andrzej.hajda@...el.com>, Neil
 Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman
 <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, David Airlie
 <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley
 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
 <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>,
 Philipp Zabel <p.zabel@...gutronix.de>, Vinod Koul <vkoul@...nel.org>,
 Kishon Vijay Abraham I <kishon@...nel.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Liu Ying
 <victor.liu@....com>, Ulf Hansson <ulf.hansson@...aro.org>,
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
 linux-pm@...r.kernel.org
Subject: Re: [PATCH V8 02/12] phy: freescale: add Samsung HDMI PHY

On Sat,  3 Feb 2024 10:52:42 -0600
Adam Ford <aford173@...il.com> wrote:

> From: Lucas Stach <l.stach@...gutronix.de>
> 
> This adds the driver for the Samsung HDMI PHY found on the
> i.MX8MP SoC.
> 
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> Signed-off-by: Adam Ford <aford173@...il.com>
> Tested-by: Alexander Stein <alexander.stein@...tq-group.com>

[...]

> +#define PHY_REG_33		0x84
> +#define  REG33_MODE_SET_DONE	BIT(7)
> +#define  REG33_FIX_DA		BIT(1)
> +
> +#define PHY_REG_34		0x88
> +#define  REG34_PHY_READY	BIT(7)
> +#define  REG34_PLL_LOCK		BIT(6)
> +#define  REG34_PHY_CLK_READY	BIT(5)
> +
> +

Nitpick: only one empty line here.

> +#define PHY_PLL_REGS_NUM 48

[...]

> +static int phy_clk_register(struct fsl_samsung_hdmi_phy *phy)
> +{
> +	struct device *dev = phy->dev;
> +	struct device_node *np = dev->of_node;
> +	struct clk_init_data init;
> +	const char *parent_name;
> +	struct clk *phyclk;
> +	int ret;
> +
> +	parent_name = __clk_get_name(phy->refclk);
> +
> +	init.parent_names = &parent_name;
> +	init.num_parents = 1;
> +	init.flags = 0;
> +	init.name = "hdmi_pclk";
> +	init.ops = &phy_clk_ops;
> +
> +	phy->hw.init = &init;
> +
> +	phyclk = devm_clk_register(dev, &phy->hw);
> +	if (IS_ERR(phyclk))
> +		return dev_err_probe(dev, PTR_ERR(phyclk),
> +				     "failed to register clock\n");
> +
> +	ret = of_clk_add_provider(np, of_clk_src_simple_get, phyclk);

Ouch:

> This function is *deprecated*. Use of_clk_add_hw_provider() instead.

Appears as an easy replacement though.

Otherwise looks good.

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com