Re: [PATCH v2 2/2] phy: econet: Add PCIe PHY driver for EcoNet EN751221 and EN7528 SoCs.

[Caleb James DeLisle <cjd@cjdns.fr>]

On 10/05/2026 13:16, Vinod Koul wrote:
> On 04-04-26, 18:49, Caleb James DeLisle wrote:
>> Introduce support for EcoNet PCIe PHY controllers found in EN751221
>> and EN7528 SoCs, these SoCs are not identical but are similar, each
>> having one Gen1 port, and one Gen1/Gen2 port.
>>
>> Co-developed-by: Ahmed Naseef <naseefkm@gmail.com>
>> Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
>> [cjd@cjdns.fr: add EN751221 support and refactor for clarity]
>> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
>> ---
>>   MAINTAINERS                   |   1 +
>>   drivers/phy/Kconfig           |  12 +++
>>   drivers/phy/Makefile          |   1 +
>>   drivers/phy/phy-econet-pcie.c | 180 ++++++++++++++++++++++++++++++++++
>>   4 files changed, 194 insertions(+)
>>   create mode 100644 drivers/phy/phy-econet-pcie.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 1b016212e4cb..b2d37c7c80af 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -9177,6 +9177,7 @@ M:	Caleb James DeLisle <cjd@cjdns.fr>
>>   L:	linux-mips@vger.kernel.org
>>   S:	Maintained
>>   F:	Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
>> +F:	drivers/phy/phy-econet-pcie.c
>>   
>>   ECRYPT FILE SYSTEM
>>   M:	Tyler Hicks <code@tyhicks.com>
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index 227b9a4c612e..9aad68829d72 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -66,6 +66,18 @@ config PHY_CAN_TRANSCEIVER
>>   	  functional modes using gpios and sets the attribute max link
>>   	  rate, for CAN drivers.
>>   
>> +config PHY_ECONET_PCIE
>> +	tristate "EcoNet PCIe-PHY Driver"
>> +	depends on ECONET || COMPILE_TEST
>> +	depends on OF
>> +	select GENERIC_PHY
>> +	select REGMAP_MMIO
>> +	help
>> +	  Say Y here to add support for EcoNet PCIe PHY driver.
>> +	  This driver create the basic PHY instance and provides initialize
>> +	  callback for PCIe GEN1 and GEN2 ports. This PHY is found on
>> +	  EcoNet SoCs including EN751221 and EN7528.
>> +
>>   config PHY_GOOGLE_USB
>>   	tristate "Google Tensor SoC USB PHY driver"
>>   	select GENERIC_PHY
>> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
>> index f49d83f00a3d..42959ed383fd 100644
>> --- a/drivers/phy/Makefile
>> +++ b/drivers/phy/Makefile
>> @@ -9,6 +9,7 @@ obj-$(CONFIG_GENERIC_PHY)		+= phy-core.o
>>   obj-$(CONFIG_GENERIC_PHY_MIPI_DPHY)	+= phy-core-mipi-dphy.o
>>   obj-$(CONFIG_PHY_AIROHA_PCIE)		+= phy-airoha-pcie.o
>>   obj-$(CONFIG_PHY_CAN_TRANSCEIVER)	+= phy-can-transceiver.o
>> +obj-$(CONFIG_PHY_ECONET_PCIE)		+= phy-econet-pcie.o
>>   obj-$(CONFIG_PHY_GOOGLE_USB)		+= phy-google-usb.o
>>   obj-$(CONFIG_USB_LGM_PHY)		+= phy-lgm-usb.o
>>   obj-$(CONFIG_PHY_LPC18XX_USB_OTG)	+= phy-lpc18xx-usb-otg.o
>> diff --git a/drivers/phy/phy-econet-pcie.c b/drivers/phy/phy-econet-pcie.c
>> new file mode 100644
>> index 000000000000..d2c6e0c1f331
>> --- /dev/null
>> +++ b/drivers/phy/phy-econet-pcie.c
>> @@ -0,0 +1,180 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Author: Caleb James DeLisle <cjd@cjdns.fr>
>> + *	   Ahmed Naseef <naseefkm@gmail.com>
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/regmap.h>
>> +
>> +/* Rx detection timing for EN751221: 16*8 clock cycles  */
>> +#define EN751221_RXDET_VAL		16
>> +
>> +/* Rx detection timing when in power mode 3 */
>> +#define EN75_RXDET_P3_REG		0xa28
>> +#define EN75_RXDET_P3_MASK		GENMASK(17, 9)
>> +
>> +/* Rx detection timing when in power mode 2 */
>> +#define EN75_RXDET_P2_REG		0xa2c
>> +#define EN75_RXDET_P2_MASK		GENMASK(8, 0)
>> +
>> +/* Rx impedance */
>> +#define EN75_RX_IMPEDANCE_REG		0xb2c
>> +#define EN75_RX_IMPEDANCE_MASK		GENMASK(13, 12)
>> +enum en75_rx_impedance {
>> +	EN75_RX_IMPEDANCE_100_OHM	= 0,
>> +	EN75_RX_IMPEDANCE_95_OHM	= 1,
>> +	EN75_RX_IMPEDANCE_90_OHM	= 2,
>> +};
>> +
>> +/* PLL Invert clock */
>> +#define EN75_PLL_PH_INV_REG		0x4a0
>> +#define EN75_PLL_PH_INV_MASK		BIT(5)
>> +
>> +struct en75_phy_op {
>> +	u32 reg;
>> +	u32 mask;
>> +	u32 val;
>> +};
>> +
>> +struct en7528_pcie_phy {
>> +	struct regmap *regmap;
>> +	const struct en75_phy_op *data;
>> +};
>> +
>> +/* Port 0 PHY: set LCDDS_CLK_PH_INV for PLL operation */
>> +static const struct en75_phy_op en7528_phy_gen1[] = {
>> +	{
>> +		.reg = EN75_PLL_PH_INV_REG,
>> +		.mask = EN75_PLL_PH_INV_MASK,
>> +		.val = 1,
>> +	},
>> +	{ /* sentinel */ }
>> +};
>> +
>> +/* EN7528 Port 1 PHY: Rx impedance tuning, target R -5 Ohm */
>> +static const struct en75_phy_op en7528_phy_gen2[] = {
>> +	{
>> +		.reg = EN75_RX_IMPEDANCE_REG,
>> +		.mask = EN75_RX_IMPEDANCE_MASK,
>> +		.val = EN75_RX_IMPEDANCE_95_OHM,
>> +	},
>> +	{ /* sentinel */ }
>> +};
>> +
>> +/* EN751221 Port 1 PHY, set RX detect to 16*8 clock cycles */
>> +static const struct en75_phy_op en751221_phy_gen2[] = {
>> +	{
>> +		.reg = EN75_RXDET_P3_REG,
>> +		.mask = EN75_RXDET_P3_MASK,
>> +		.val = EN751221_RXDET_VAL,
>> +	},
>> +	{
>> +		.reg = EN75_RXDET_P2_REG,
>> +		.mask = EN75_RXDET_P2_MASK,
>> +		.val = EN751221_RXDET_VAL,
>> +	},
>> +	{ /* sentinel */ }
>> +};
>> +
>> +static int en75_pcie_phy_init(struct phy *phy)
>> +{
>> +	struct en7528_pcie_phy *ephy = phy_get_drvdata(phy);
>> +	const struct en75_phy_op *data = ephy->data;
>> +	int i, ret;
>> +	u32 val;
>> +
>> +	for (i = 0; data[i].mask || data[i].val; i++) {
>> +		if (i)
>> +			usleep_range(1000, 2000);
>> +
>> +		val = field_prep(data[i].mask, data[i].val);
> Please see:
>
> https://sashiko.dev/#/patchset/20260425173642.406089-1-cjd%40cjdns.fr


I think this is an error in that the AI is not correctly differentiating 
between field_prep() which accepts a non-constant mask, and FIELD_PREP() 
which does not. In any case I can confirm that it does compile and work 
correctly on the device.

On another note, I think you may be the creator of Sashiko, if so, thank 
you for your work - it helped me with another patch already.

Thanks,

Caleb



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