linux-kernel - Re: [PATCH v2 2/2] phy: add hix5hd2-sata-phy driver

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Message-ID: <53B3EC18.5020509@ti.com>
Date:	Wed, 2 Jul 2014 16:55:12 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Zhangfei Gao <zhangfei.gao@...aro.org>, <arnd@...db.de>,
	<mark.rutland@....com>, <haifeng.yan@...aro.org>,
	<jchxue@...il.com>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>,
	Jiancheng Xue <xuejiancheng@...wei.com>
Subject: Re: [PATCH v2 2/2] phy: add hix5hd2-sata-phy driver

Hi,

On Wednesday 25 June 2014 02:44 PM, Zhangfei Gao wrote:
> From: Jiancheng Xue <xuejiancheng@...wei.com>
> 
> Add hix5hd2-sata-phy driver on Hisilicon hix5hd2 soc.
> 
> Signed-off-by: Jiancheng Xue <xuejiancheng@...wei.com>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> ---
>  drivers/phy/Kconfig            |    8 ++
>  drivers/phy/Makefile           |    1 +
>  drivers/phy/phy-hix5hd2-sata.c |  192 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 201 insertions(+)
>  create mode 100644 drivers/phy/phy-hix5hd2-sata.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 16a2f06..782953d 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -109,6 +109,14 @@ config PHY_EXYNOS5250_SATA
>  	  SATA 3.0 Gb/s, SATA 6.0 Gb/s speeds. It supports one SATA host
>  	  port to accept one SATA device.
>  
> +config PHY_HIX5HD2_SATA
> +	tristate "HIX5HD2 SATA PHY Driver"
> +	depends on ARCH_HIX5HD2 && OF

depends on HAS_IOMEM?
> +	select GENERIC_PHY
> +	select MFD_SYSCON
> +	help
> +	  Support for SATA PHY on Hisilicon hix5hd2 Soc.
> +
>  config PHY_SUN4I_USB
>  	tristate "Allwinner sunxi SoC USB PHY driver"
>  	depends on ARCH_SUNXI && HAS_IOMEM && OF
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index b4f1d57..54f04d0 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
>  obj-$(CONFIG_TI_PIPE3)			+= phy-ti-pipe3.o
>  obj-$(CONFIG_TWL4030_USB)		+= phy-twl4030-usb.o
>  obj-$(CONFIG_PHY_EXYNOS5250_SATA)	+= phy-exynos5250-sata.o
> +obj-$(CONFIG_PHY_HIX5HD2_SATA)		+= phy-hix5hd2-sata.o
>  obj-$(CONFIG_PHY_SUN4I_USB)		+= phy-sun4i-usb.o
>  obj-$(CONFIG_PHY_SAMSUNG_USB2)		+= phy-exynos-usb2.o
>  phy-exynos-usb2-y			+= phy-samsung-usb2.o
> diff --git a/drivers/phy/phy-hix5hd2-sata.c b/drivers/phy/phy-hix5hd2-sata.c
> new file mode 100644
> index 0000000..6f1e3ea
> --- /dev/null
> +++ b/drivers/phy/phy-hix5hd2-sata.c
> @@ -0,0 +1,192 @@
> +/*
> + * Copyright (c) 2014 Linaro Ltd.
> + * Copyright (c) 2014 Hisilicon Limited.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +#include <linux/phy/phy.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <linux/delay.h>

can this be arranged alphabetically? Helps while adding new header files.
> +
> +#define SATA_PHY0_CTLL		0xa0
> +#define MPLL_MULTIPLIER_SHIFT	1
> +#define MPLL_MULTIPLIER_MASK	0xfe
> +#define MPLL_MULTIPLIER_50M	0x3c
> +#define MPLL_MULTIPLIER_100M	0x1e
> +#define PHY_RESET		BIT(0)
> +#define REF_SSP_EN		BIT(9)
> +#define SSC_EN			BIT(10)
> +#define REF_USE_PAD		BIT(23)
> +
> +#define SATA_PORT_PHYCTL	0x174
> +#define SPEED_MODE_MASK		0x6f0000
> +#define HALF_RATE_SHIFT		16
> +#define PHY_CONFIG_SHIFT	18
> +#define GEN2_EN_SHIFT		21
> +#define SPEED_CTRL		BIT(20)
> +
> +#define SATA_PORT_PHYCTL1	0x148
> +#define AMPLITUDE_MASK		0x3ffffe
> +#define AMPLITUDE_GEN3		0x68
> +#define AMPLITUDE_GEN3_SHIFT	15
> +#define AMPLITUDE_GEN2		0x56
> +#define AMPLITUDE_GEN2_SHIFT	8
> +#define AMPLITUDE_GEN1		0x56
> +#define AMPLITUDE_GEN1_SHIFT	1
> +
.
.
<snip>
.
.
> +
> +static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
> +{
> +	struct phy_provider *phy_provider;
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct phy *phy;
> +	struct hix5hd2_priv *priv;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	priv->base = devm_ioremap(dev, res->start, resource_size(res));
> +	if (!priv->base)
> +		return -ENOMEM;
> +
> +	priv->peri_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
> +						"hisilicon,peripheral-syscon");
> +	if (IS_ERR(priv->peri_ctrl))
> +		priv->peri_ctrl = NULL;

if syscon_regmap_lookup_by_phandle returns EPROBE_DEFER, you have to return
EPROBE_DEFER no?

Rest looks fine to me.

Thanks
Kishon
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