Message-ID: <52FC6BF5.9030900@ti.com>
Date:	Thu, 13 Feb 2014 12:23:41 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Lee Jones <lee.jones@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	<alexandre.torgue@...com>
Subject: Re: [PATCH 4/4] phy: miphy365x: Provide support for the MiPHY356x
 Generic PHY

Hi,

On Wednesday 12 February 2014 09:33 PM, Lee Jones wrote:
> The MiPHY365x is a Generic PHY which can serve various SATA or PCIe
> devices. It has 2 ports which it can use for either; both SATA, both

various SATA or PCIe devices in STMicroelectronics STiH41x SoC series?
> PCIe or one of each in any configuration.
> 
> Cc: Kishon Vijay Abraham I <kishon@...com>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/phy/Kconfig         |   8 +
>  drivers/phy/Makefile        |   1 +
>  drivers/phy/phy-miphy365x.c | 634 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 643 insertions(+)
>  create mode 100644 drivers/phy/phy-miphy365x.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 330ef2d..bb2706a 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -21,6 +21,14 @@ config PHY_EXYNOS_MIPI_VIDEO
>  	  Support for MIPI CSI-2 and MIPI DSI DPHY found on Samsung S5P
>  	  and EXYNOS SoCs.
>  
> +config PHY_MIPHY365X
> +	tristate "STMicroelectronics MIPHY365X PHY driver for STiH41x series"
> +	depends on ARCH_STI
> +	depends on GENERIC_PHY
depends on CONFIG_OF and HAS_IOMEM?
> +	help
> +	  Enable this to support the miphy transceiver (for SATA/PCIE)
> +	  that is part of STMicroelectronics STiH41x SoC series.
> +
>  config OMAP_USB2
>  	tristate "OMAP USB2 PHY Driver"
>  	depends on ARCH_OMAP2PLUS
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index d0caae9..5879639 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -5,5 +5,6 @@
>  obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
>  obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO)	+= phy-exynos-dp-video.o
>  obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
> +obj-$(CONFIG_PHY_MIPHY365X)		+= phy-miphy365x.o
>  obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
>  obj-$(CONFIG_TWL4030_USB)		+= phy-twl4030-usb.o
> diff --git a/drivers/phy/phy-miphy365x.c b/drivers/phy/phy-miphy365x.c
> new file mode 100644
> index 0000000..c4124e3
> --- /dev/null
> +++ b/drivers/phy/phy-miphy365x.c
> @@ -0,0 +1,634 @@
> +/*
> + * Copyright (C) 2014 STMicroelectronics
> + *
> + * STMicroelectronics PHY driver MiPHY365 (for SoC STiH416).
> + *
> + * Author: Alexandre Torgue <alexandre.torgue@...com>

The author of this patch is not Alexandre Torgue?
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2, as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/clk.h>
> +#include <linux/phy/phy.h>
> +#include <linux/delay.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +
> +#include <dt-bindings/phy/phy-miphy365x.h>
> +
> +#define HFC_TIMEOUT		50
> +
> +#define SYSCFG_2521		0x824
> +#define SYSCFG_2522		0x828
> +#define SYSCFG_PCIE_SATA_MASK	BIT(1)
> +#define SYSCFG_PCIE_SATA_POS	1
> +
> +/* MiPHY365x register definitiona */
> +#define RESET_REG		0x00
> +#define RST_PLL			BIT(1)

There are quite a few alignment problems with these macros. It needs to be fixed.
> +#define RST_PLL_CAL		BIT(2)
> +#define RST_RX			BIT(4)
> +#define RST_MACRO		BIT(7)
> +
> +#define STATUS_REG		0x01
> +#define IDLL_RDY		BIT(0)
> +#define PLL_RDY			BIT(1)
> +#define DES_BIT_LOCK		BIT(2)
> +#define DES_SYMBOL_LOCK		BIT(3)
> +
> +#define CTRL_REG		0x02
> +#define TERM_EN			BIT(0)
> +#define PCI_EN			BIT(2)
> +#define DES_BIT_LOCK_EN		BIT(3)
> +#define TX_POL			BIT(5)
> +
> +#define INT_CTRL_REG		0x03
> +
> +#define BOUNDARY1_REG		0x10
> +#define SPDSEL_SEL		BIT(0)
> +
> +#define BOUNDARY3_REG		0x12
> +#define TX_SPDSEL_GEN1_VAL	0
> +#define TX_SPDSEL_GEN2_VAL	0x01
> +#define TX_SPDSEL_GEN3_VAL	0x02
> +#define RX_SPDSEL_GEN1_VAL	0
> +#define RX_SPDSEL_GEN2_VAL	(0x01 << 3)
> +#define RX_SPDSEL_GEN3_VAL	(0x02 << 3)
> +
> +#define PCIE_REG		0x16
> +
> +#define BUF_SEL_REG		0x20
> +#define CONF_GEN_SEL_GEN3	0x02
> +#define CONF_GEN_SEL_GEN2	0x01
> +#define PD_VDDTFILTER		BIT(4)
> +
> +#define TXBUF1_REG		0x21
> +#define SWING_VAL		0x04
> +#define SWING_VAL_GEN1		0x03
> +#define PREEMPH_VAL		(0x3 << 5)
> +
> +#define TXBUF2_REG		0x22
> +#define TXSLEW_VAL		0x2
> +#define TXSLEW_VAL_GEN1		0x4
> +
> +#define RXBUF_OFFSET_CTRL_REG	0x23
> +
> +#define RXBUF_REG		0x25
> +#define SDTHRES_VAL		0x01
> +#define EQ_ON3			(0x03 << 4)
> +#define EQ_ON1			(0x01 << 4)
> +
> +#define COMP_CTRL1_REG		0x40
> +#define START_COMSR		BIT(0)
> +#define START_COMZC		BIT(1)
> +#define COMP_AUTO_LOAD		BIT(4)
> +
> +#define COMP_CTRL2_REG		0x41
> +#define COMP_2MHZ_RAT_GEN1	0x1e
> +#define COMP_2MHZ_RAT		0xf
> +
> +#define COMP_CTRL3_REG		0x42
> +#define COMSR_COMP_REF		0x33
> +
> +#define COMP_IDLL_REG		0x47
> +#define COMZC_IDLL		0x2a
> +
> +#define PLL_CTRL1_REG		0x50
> +#define PLL_START_CAL		BIT(0)
> +#define BUF_EN			BIT(2)
> +#define SYNCHRO_TX		BIT(3)
> +#define SSC_EN			BIT(6)
> +#define CONFIG_PLL		BIT(7)
> +
> +#define PLL_CTRL2_REG		0x51
> +#define BYPASS_PLL_CAL		BIT(1)
> +
> +#define PLL_RAT_REG		0x52
> +
> +#define PLL_SSC_STEP_MSB_REG	0x56
> +#define PLL_SSC_STEP_MSB_VAL	0x03
> +
> +#define PLL_SSC_STEP_LSB_REG	0x57
> +#define PLL_SSC_STEP_LSB_VAL	0x63
> +
> +#define PLL_SSC_PER_MSB_REG	0x58
> +#define PLL_SSC_PER_MSB_VAL	0
> +
> +#define PLL_SSC_PER_LSB_REG	0x59
> +#define PLL_SSC_PER_LSB_VAL	0xf1
> +
> +#define IDLL_TEST_REG		0x72
> +#define START_CLK_HF		BIT(6)
> +
> +#define DES_BITLOCK_REG		0x86
> +#define BIT_LOCK_LEVEL		0x01
> +#define BIT_LOCK_CNT_512	(0x03 << 5)
> +
> +static u8 ports[] = { MIPHY_PORT_0, MIPHY_PORT_1 };
> +
> +struct miphy365x_phy {
> +	struct phy *phy;
> +	void __iomem *base;
> +	void __iomem *sata;
> +	void __iomem *pcie;
> +	u8 type;
> +	u8 port;
> +};
> +
> +struct miphy365x_dev {
> +	struct device *dev;
> +	struct mutex miphy_mutex;
> +	struct miphy365x_phy phys[ARRAY_SIZE(ports)];
> +	bool pcie_tx_pol_inv;
> +	bool sata_tx_pol_inv;
> +	u32 sata_gen;
> +	struct regmap *regmap;
> +};
> +
> +enum miphy_sata_gen {
> +	SATA_GEN1,
> +	SATA_GEN2,
> +	SATA_GEN3
> +};
> +
> +static u8 rx_tx_spd[] = {
> +	TX_SPDSEL_GEN1_VAL | RX_SPDSEL_GEN1_VAL,
> +	TX_SPDSEL_GEN2_VAL | RX_SPDSEL_GEN2_VAL,
> +	TX_SPDSEL_GEN3_VAL | RX_SPDSEL_GEN3_VAL
> +};
> +
> +#define miphy365x_phy_to_dev(inst) \
> +	container_of((inst), struct miphy365x_dev, phys[(inst)->port]);
> +
> +/*
> + * This function selects the system configuration,
> + * either two SATA, one SATA and one PCIe, or two PCIe lanes.
> + */
> +static int miphy365x_set_path(struct miphy365x_phy *miphy_phy,
> +			      struct miphy365x_dev *miphy_dev)
> +{
> +	u8 config = miphy_phy->type | miphy_phy->port;
> +	u32 mask  = SYSCFG_PCIE_SATA_MASK;
> +	u32 reg;
> +	bool sata;
> +
> +	switch (config) {
> +	case MIPHY_SATA_PORT0:
> +		reg = SYSCFG_2521;
> +		sata = true;

How do we configure PORT1 for SATA here? Do we really support all the system
configuration?
> +		break;
> +	case MIPHY_PCIE_PORT1:
> +		reg = SYSCFG_2522;
> +		sata = false;
> +		break;
> +	default:
> +		dev_err(miphy_dev->dev, "Configuration not supported\n");
> +		return -EINVAL;
> +	}
> +
> +	return regmap_update_bits(miphy_dev->regmap, reg, mask,
> +				  sata << SYSCFG_PCIE_SATA_POS);
> +}
> +
> +static void miphy365x_phy_init_pcie_port(struct miphy365x_phy *miphy_phy,
> +					 struct miphy365x_dev *miphy_dev)
> +{
> +	u8 val;
> +
> +	if (!miphy_dev->pcie_tx_pol_inv)
> +		return;
> +
> +	/* Invert Tx polarity and clear pci_txdetect_pol bit */
> +	val = TERM_EN | PCI_EN | DES_BIT_LOCK_EN | TX_POL;
> +	writeb_relaxed(val, miphy_phy->base + CTRL_REG);
> +	writeb_relaxed(0x00, miphy_phy->base + PCIE_REG);
> +}
> +
> +static inline int miphy365x_phy_hfc_not_rdy(struct miphy365x_phy *miphy_phy,
> +					    struct miphy365x_dev *miphy_dev)
> +{
> +	int timeout = HFC_TIMEOUT;
> +	u8 mask = IDLL_RDY | PLL_RDY;
> +	u8 regval;
> +
> +	do {
> +		regval = readb_relaxed(miphy_phy->base + STATUS_REG);
> +		usleep_range(2000, 2500);

Any comment on how this delay value is obtained?
> +	} while (timeout-- && (regval & mask));
> +
> +	if (timeout < 0) {
> +		dev_err(miphy_dev->dev, "HFC ready timeout!\n");
> +		return -EBUSY;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline int miphy365x_phy_rdy(struct miphy365x_phy *miphy_phy,
> +				    struct miphy365x_dev *miphy_dev)
> +{
> +	int timeout = HFC_TIMEOUT;
> +	u8 mask = mask = IDLL_RDY | PLL_RDY;

just u8 mask = IDLL_RDY | PLL_RDY; would suffice.
> +	u8 regval;
> +
> +	do {
> +		regval = readb_relaxed(miphy_phy->base + STATUS_REG);
> +		usleep_range(2000, 2500);

same here.
> +	} while (timeout-- && ((regval & mask) != mask));
> +
> +	if (timeout < 0) {
> +		dev_err(miphy_dev->dev, "PHY not ready timeout!\n");
> +		return -EBUSY;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline void miphy365x_phy_set_comp(struct miphy365x_phy *miphy_phy,
> +					  struct miphy365x_dev *miphy_dev)
> +{
> +	u8 val, mask;
> +
> +	if (miphy_dev->sata_gen == SATA_GEN1)
> +		writeb_relaxed(COMP_2MHZ_RAT_GEN1,
> +			       miphy_phy->base + COMP_CTRL2_REG);
> +	else
> +		writeb_relaxed(COMP_2MHZ_RAT,
> +			       miphy_phy->base + COMP_CTRL2_REG);
> +
> +	if (miphy_dev->sata_gen != SATA_GEN3) {
> +		writeb_relaxed(COMSR_COMP_REF,
> +			       miphy_phy->base + COMP_CTRL3_REG);
> +		/*
> +		 * Force VCO current to value defined by address 0x5A
> +		 * and disable PCIe100Mref bit
> +		 * Enable auto load compensation for pll_i_bias
> +		 */
> +		writeb_relaxed(BYPASS_PLL_CAL, miphy_phy->base + PLL_CTRL2_REG);
> +		writeb_relaxed(COMZC_IDLL, miphy_phy->base + COMP_IDLL_REG);
> +	}
> +
> +	/*
> +	 * Force restart compensation and enable auto load
> +	 * for Comzc_Tx, Comzc_Rx and Comsr on macro
> +	 */
> +	val = START_COMSR | START_COMZC | COMP_AUTO_LOAD;
> +	writeb_relaxed(val, miphy_phy->base + COMP_CTRL1_REG);
> +
> +	mask = DES_BIT_LOCK | DES_SYMBOL_LOCK;
> +	while ((readb_relaxed(miphy_phy->base + COMP_CTRL1_REG) & mask)	!= mask)
> +		cpu_relax();

Don't we need to break from here at some point if the LOCK's are never set?
> +}
> +
> +static inline void miphy365x_phy_set_ssc(struct miphy365x_phy *miphy_phy,
> +					 struct miphy365x_dev *miphy_dev)
> +{
> +	u8 val;
> +
> +	/*
> +	 * SSC Settings. SSC will be enabled through Link
> +	 * SSC Ampl. = 0.4%
> +	 * SSC Freq = 31KHz
> +	 */
> +	writeb_relaxed(PLL_SSC_STEP_MSB_VAL,
> +			miphy_phy->base + PLL_SSC_STEP_MSB_REG);
> +	writeb_relaxed(PLL_SSC_STEP_LSB_VAL,
> +			miphy_phy->base + PLL_SSC_STEP_LSB_REG);
> +	writeb_relaxed(PLL_SSC_PER_MSB_VAL,
> +			miphy_phy->base + PLL_SSC_PER_MSB_REG);
> +	writeb_relaxed(PLL_SSC_PER_LSB_VAL,
> +			miphy_phy->base + PLL_SSC_PER_LSB_REG);
> +
> +	/* SSC Settings complete */
> +	if (miphy_dev->sata_gen == SATA_GEN1) {
> +		val = PLL_START_CAL | BUF_EN | SYNCHRO_TX | CONFIG_PLL;
> +		writeb_relaxed(val, miphy_phy->base + PLL_CTRL1_REG);
> +	} else {
> +		val = SSC_EN | PLL_START_CAL | BUF_EN | SYNCHRO_TX | CONFIG_PLL;
> +		writeb_relaxed(val, miphy_phy->base + PLL_CTRL1_REG);
> +	}
> +}
> +
> +static int miphy365x_phy_init_sata_port(struct miphy365x_phy *miphy_phy,
> +					struct miphy365x_dev *miphy_dev)
> +{
> +	int ret;
> +	u8 val;
> +
> +	/*
> +	 * Force PHY macro reset, PLL calibration reset, PLL reset
> +	 * and assert Deserializer Reset
> +	 */
> +	val = RST_PLL | RST_PLL_CAL | RST_RX | RST_MACRO;
> +	writeb_relaxed(val, miphy_phy->base + RESET_REG);
> +
> +	if (miphy_dev->sata_tx_pol_inv)
> +		writeb_relaxed(TX_POL, miphy_phy->base + CTRL_REG);
> +
> +	/*
> +	 * Force macro1 to use rx_lspd, tx_lspd
> +	 * Force Rx_Clock on first I-DLL phase
> +	 * Force Des in HP mode on macro, rx_lspd, tx_lspd for Gen2/3
> +	 */
> +	writeb_relaxed(SPDSEL_SEL, miphy_phy->base + BOUNDARY1_REG);
> +	writeb_relaxed(START_CLK_HF, miphy_phy->base + IDLL_TEST_REG);
> +	val = rx_tx_spd[miphy_dev->sata_gen];
> +	writeb_relaxed(val, miphy_phy->base + BOUNDARY3_REG);
> +
> +	/* Wait for HFC_READY = 0 */
> +	ret = miphy365x_phy_hfc_not_rdy(miphy_phy, miphy_dev);
> +	if (ret)
> +		return ret;
> +
> +	/* Compensation Recalibration */
> +	miphy365x_phy_set_comp(miphy_phy, miphy_dev);
> +
> +	switch (miphy_dev->sata_gen) {
> +	case SATA_GEN3:
> +		/*
> +		 * TX Swing target 550-600mv peak to peak diff
> +		 * Tx Slew target 90-110ps rising/falling time
> +		 * Rx Eq ON3, Sigdet threshold SDTH1
> +		 */
> +		val = PD_VDDTFILTER | CONF_GEN_SEL_GEN3;
> +		writeb_relaxed(val, miphy_phy->base + BUF_SEL_REG);
> +		val = SWING_VAL | PREEMPH_VAL;
> +		writeb_relaxed(val, miphy_phy->base + TXBUF1_REG);
> +		writeb_relaxed(TXSLEW_VAL, miphy_phy->base + TXBUF2_REG);
> +		writeb_relaxed(0x00, miphy_phy->base + RXBUF_OFFSET_CTRL_REG);
> +		val = SDTHRES_VAL | EQ_ON3;
> +		writeb_relaxed(val, miphy_phy->base + RXBUF_REG);
> +		break;
> +	case SATA_GEN2:
> +		/*
> +		 * conf gen sel=0x1 to program Gen2 banked registers
> +		 * VDDT filter ON
> +		 * Tx Swing target 550-600mV peak-to-peak diff
> +		 * Tx Slew target 90-110 ps rising/falling time
> +		 * RX Equalization ON1, Sigdet threshold SDTH1
> +		 */
> +		writeb_relaxed(CONF_GEN_SEL_GEN2,
> +			       miphy_phy->base + BUF_SEL_REG);
> +		writeb_relaxed(SWING_VAL, miphy_phy->base + TXBUF1_REG);
> +		writeb_relaxed(TXSLEW_VAL, miphy_phy->base + TXBUF2_REG);
> +		val = SDTHRES_VAL | EQ_ON1;
> +		writeb_relaxed(val, miphy_phy->base + RXBUF_REG);
> +		break;
> +	case SATA_GEN1:
> +		/*
> +		 * conf gen sel = 00b to program Gen1 banked registers
> +		 * VDDT filter ON
> +		 * Tx Swing target 500-550mV peak-to-peak diff
> +		 * Tx Slew target120-140 ps rising/falling time
> +		 */
> +		writeb_relaxed(PD_VDDTFILTER, miphy_phy->base + BUF_SEL_REG);
> +		writeb_relaxed(SWING_VAL_GEN1, miphy_phy->base + TXBUF1_REG);
> +		writeb_relaxed(TXSLEW_VAL_GEN1,	miphy_phy->base + TXBUF2_REG);
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	/* Force Macro1 in partial mode & release pll cal reset */
> +	writeb_relaxed(RST_RX, miphy_phy->base + RESET_REG);
> +	usleep_range(100, 150);
> +
> +	miphy365x_phy_set_ssc(miphy_phy, miphy_dev);
> +
> +	/* Wait for phy_ready */
> +	ret = miphy365x_phy_rdy(miphy_phy, miphy_dev);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * Enable macro1 to use rx_lspd & tx_lspd
> +	 * Release Rx_Clock on first I-DLL phase on macro1
> +	 * Assert deserializer reset
> +	 * des_bit_lock_en is set
> +	 * bit lock detection strength
> +	 * Deassert deserializer reset
> +	 */
> +	writeb_relaxed(0x00, miphy_phy->base + BOUNDARY1_REG);
> +	writeb_relaxed(0x00, miphy_phy->base + IDLL_TEST_REG);
> +	writeb_relaxed(RST_RX, miphy_phy->base + RESET_REG);
> +	val = miphy_dev->sata_tx_pol_inv ?
> +		(TX_POL | DES_BIT_LOCK_EN) : DES_BIT_LOCK_EN;
> +	writeb_relaxed(val, miphy_phy->base + CTRL_REG);
> +
> +	val = BIT_LOCK_CNT_512 | BIT_LOCK_LEVEL;
> +	writeb_relaxed(val, miphy_phy->base + DES_BITLOCK_REG);
> +	writeb_relaxed(0x00, miphy_phy->base + RESET_REG);
> +
> +	return 0;
> +}
> +
> +static int miphy365x_phy_init(struct phy *phy)
> +{
> +	int ret = 0;
> +	struct miphy365x_phy *miphy_phy = phy_get_drvdata(phy);
> +	struct miphy365x_dev *miphy_dev = miphy365x_phy_to_dev(miphy_phy);
> +
> +	mutex_lock(&miphy_dev->miphy_mutex);
> +
> +	ret = miphy365x_set_path(miphy_phy, miphy_dev);
> +	if (ret) {
> +		mutex_unlock(&miphy_dev->miphy_mutex);
> +		return ret;
> +	}
> +
> +	/* Initialise Miphy for PCIe or SATA */
> +	if (miphy_phy->type == MIPHY_TYPE_PCIE)
> +		miphy365x_phy_init_pcie_port(miphy_phy, miphy_dev);
> +	else
> +		ret = miphy365x_phy_init_sata_port(miphy_phy, miphy_dev);
> +
> +	mutex_unlock(&miphy_dev->miphy_mutex);
> +
> +	return ret;
> +}
> +
> +static int miphy365x_phy_power_on(struct phy *phy)
> +{
> +	return 0;
> +}
> +
> +static int miphy365x_phy_power_off(struct phy *phy)
> +{
> +	return 0;
> +}

Both these empty functions can be removed.
> +
> +static struct phy *miphy365x_phy_xlate(struct device *dev,
> +				       struct of_phandle_args *args)
> +{
> +	struct miphy365x_dev *state = dev_get_drvdata(dev);
> +	u8 port = args->args[0];
> +	u8 type = args->args[1];
> +
> +	if (WARN_ON(port >= ARRAY_SIZE(ports)))
> +		return ERR_PTR(-EINVAL);
> +
> +	if (type == MIPHY_TYPE_SATA)
> +		state->phys[port].base = state->phys[port].sata;
> +	else if (type == MIPHY_TYPE_PCIE)
> +		state->phys[port].base = state->phys[port].pcie;
> +	else {
> +		WARN(1, "Invalid type specified in DT");
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	state->phys[port].type = type;
> +
> +	return state->phys[port].phy;
> +}
> +
> +static struct phy_ops miphy365x_phy_ops = {
> +	.init		= miphy365x_phy_init,
> +	.power_on	= miphy365x_phy_power_on,
> +	.power_off	= miphy365x_phy_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static int miphy365x_phy_get_base_addr(struct platform_device *pdev,
> +				       struct miphy365x_phy *phy, u8 port)
> +{
> +	struct resource *res;
> +	char sata[16];
> +	char pcie[16];

It can be done with a single variable ;-)
> +
> +	sprintf(sata, "sata%d", port);
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, sata);
> +	if (!res)
> +		return -ENODEV;
> +
> +	phy->sata = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> +	if (!phy->sata)
> +		return -ENOMEM;
> +
> +	sprintf(pcie, "pcie%d", port);
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pcie);
> +	if (!res)
> +		return -ENODEV;
> +
> +	phy->pcie = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> +	if (!phy->pcie)
> +		return -ENOMEM;
> +
> +	return 0;
> +}
> +
> +static int miphy365x_phy_of_probe(struct device_node *np,
> +				  struct miphy365x_dev *phy_dev)
> +{
> +	const char *sata_gen;
> +
> +	phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
> +	if (IS_ERR(phy_dev->regmap)) {
> +		dev_err(phy_dev->dev, "No syscfg phandle specified\n");
> +		return PTR_ERR(phy_dev->regmap);
> +	}
> +
> +	/* Default */
> +	phy_dev->sata_gen = SATA_GEN1;
> +
> +	of_property_read_string(np, "st,sata_gen", &sata_gen);
> +	if (sata_gen) {
> +		if (!strcmp(sata_gen, "gen3"))
> +			phy_dev->sata_gen = SATA_GEN3;
> +		else if (!strcmp(sata_gen, "gen2"))
> +			phy_dev->sata_gen = SATA_GEN2;
> +	}
> +
> +	phy_dev->pcie_tx_pol_inv =
> +		of_property_read_bool(np, "st,pcie_tx_pol_inv");
> +
> +	phy_dev->sata_tx_pol_inv =
> +		of_property_read_bool(np, "st,sata_tx_pol_inv");
> +
> +	return 0;
> +}
> +
> +static int miphy365x_phy_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct miphy365x_dev *phy_dev;
> +	struct device *dev = &pdev->dev;
> +	struct phy_provider *provider;
> +	u8 port;
> +	int ret;
> +
> +	if (!np) {
> +		dev_err(dev, "No DT found\n");
> +		return -EINVAL;
> +	}
> +
> +	phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
> +	if (!phy_dev)
> +		return -ENOMEM;
> +
> +	ret = miphy365x_phy_of_probe(np, phy_dev);
> +	if (ret)
> +		return ret;
> +
> +	phy_dev->dev = dev;
> +
> +	dev_set_drvdata(dev, phy_dev);
> +
> +	mutex_init(&phy_dev->miphy_mutex);
> +
> +	provider = devm_of_phy_provider_register(dev, miphy365x_phy_xlate);
> +	if (IS_ERR(provider))
> +		return PTR_ERR(provider);

Phy provider register should be the last step in registering the PHY.

Thanks
Kishon
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists