linux-kernel - Re: [PATCH v7 10/17] phy: Add driver for rockchip Display Port PHY

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Date:	Tue, 27 Oct 2015 22:23:22 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	linux-rockchip@...ts.infradead.org
Cc:	Yakir Yang <ykk@...k-chips.com>, Inki Dae <inki.dae@...sung.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Rob Herring <robh+dt@...nel.org>, joe@...ches.com,
	Mark Yao <mark.yao@...k-chips.com>, djkurtz@...omium.org,
	dianders@...omium.org,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	linux-samsung-soc@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Kishon Vijay Abraham I <kishon@...com>,
	javier@....samsung.com, Kukjin Kim <kgene@...nel.org>,
	robherring2@...il.com, devicetree@...r.kernel.org,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Sean Paul <seanpaul@...omium.org>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, emil.l.velikov@...il.com,
	linux-kernel@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	ajaynumb@...il.com, Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v7 10/17] phy: Add driver for rockchip Display Port PHY

Am Samstag, 24. Oktober 2015, 11:06:04 schrieb Yakir Yang:
> Add phy driver for the Rockchip DisplayPort PHY module. This
> is required to get DisplayPort working in Rockchip SoCs.
> 
> Tested-by: Javier Martinez Canillas <javier@....samsung.com>
> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
> ---

> diff --git a/drivers/phy/phy-rockchip-dp.c b/drivers/phy/phy-rockchip-dp.c
> new file mode 100644
> index 0000000..4af19af
> --- /dev/null
> +++ b/drivers/phy/phy-rockchip-dp.c
> @@ -0,0 +1,153 @@
> +/*
> + * Rockchip DP PHY driver
> + *
> + * Copyright (C) 2015 FuZhou Rockchip Co., Ltd.
> + * Author: Yakir Yang <ykk@@rock-chips.com>
> + *
> + * 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.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/clk.h>
> +#include <linux/phy/phy.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/platform_device.h>
> +
> +#define GRF_SOC_CON12                   0x0274
> +#define GRF_EDP_REF_CLK_SEL_INTER	BIT(4)
> +#define GRF_EDP_PHY_SIDDQ_WRITE_EN      BIT(21)
> +#define GRF_EDP_PHY_SIDDQ_ON            0
> +#define GRF_EDP_PHY_SIDDQ_OFF           BIT(5)

mixed spacers (tabs and spaces), please use either tabs if you want to
align stuff or a single space.

Also you're mixing the handling here, for SIDDQ you're defining both the
actual bit as well as the write-enable bit, but for CLK_SEL_INTR you're
hard-coding the 16-bit shift down in the code.

You could also just use/copy the HIWORD_MASK macro we use for example
in the clock controller.


> +
> +struct rockchip_dp_phy {
> +	struct device  *dev;
> +	struct regmap  *grf;
> +	struct clk     *phy_24m;
> +};
> +
> +static int rockchip_set_phy_state(struct phy *phy, bool enable)
> +{
> +	struct rockchip_dp_phy *dp = phy_get_drvdata(phy);
> +	int ret;
> +
> +	if (enable) {
> +		ret = regmap_write(dp->grf, GRF_SOC_CON12,
> +				   GRF_EDP_PHY_SIDDQ_WRITE_EN |
> +				   GRF_EDP_PHY_SIDDQ_ON);
> +		if (ret < 0) {
> +			dev_err(dp->dev, "Can't enable PHY power %d\n", ret);
> +			return ret;
> +		}
> +
> +		ret = clk_prepare_enable(dp->phy_24m);
> +

unnecessary empty line after clk_prepare_enable


with these things fixed,
Reviewed-by: Heiko Stuebner <heiko@...ech.de>


Cheers,
Heiko
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