linux-kernel - Re: [PATCH v2 7/8] phy: phy-snps-eusb2: add support for exynos2200

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Message-ID: <ac7bq3toicuoppmspqvohiss5wkhgw4v6aozzstd5pr66bfcse@k7tqijab4csq>
Date: Mon, 24 Feb 2025 01:51:54 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
Cc: Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Alim Akhtar <alim.akhtar@...sung.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Abel Vesa <abel.vesa@...aro.org>, linux-arm-msm@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 7/8] phy: phy-snps-eusb2: add support for exynos2200

On Sun, Feb 23, 2025 at 02:22:26PM +0200, Ivaylo Ivanov wrote:
> The Exynos2200 SoC reuses the Synopsis eUSB2 PHY IP, alongside an
> external repeater, for USB 2.0. Add support for it to the existing
> driver.
> 
> Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>
> ---
>  drivers/phy/Kconfig          |   2 +-
>  drivers/phy/phy-snps-eusb2.c | 172 +++++++++++++++++++++++++++++++++++
>  2 files changed, 173 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 11c166204..58c911e1b 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -45,7 +45,7 @@ config PHY_PISTACHIO_USB
>  
>  config PHY_SNPS_EUSB2
>  	tristate "SNPS eUSB2 PHY Driver"
> -	depends on OF && (ARCH_QCOM || COMPILE_TEST)
> +	depends on OF && (ARCH_EXYNOS || ARCH_QCOM || COMPILE_TEST)
>  	select GENERIC_PHY
>  	help
>  	  Enable support for the USB high-speed SNPS eUSB2 phy on select
> diff --git a/drivers/phy/phy-snps-eusb2.c b/drivers/phy/phy-snps-eusb2.c
> index 7a242fe32..67a19d671 100644
> --- a/drivers/phy/phy-snps-eusb2.c
> +++ b/drivers/phy/phy-snps-eusb2.c
> @@ -13,6 +13,39 @@
>  #include <linux/regulator/consumer.h>
>  #include <linux/reset.h>
>  
> +#define EXYNOS_USB_PHY_HS_PHY_CTRL_RST	(0x0)
> +#define USB_PHY_RST_MASK		GENMASK(1, 0)
> +#define UTMI_PORT_RST_MASK		GENMASK(5, 4)
> +
> +#define EXYNOS_USB_PHY_HS_PHY_CTRL_COMMON	(0x4)
> +#define RPTR_MODE			BIT(10)
> +#define FSEL_20_MHZ_VAL			(0x1)
> +#define FSEL_24_MHZ_VAL			(0x2)
> +#define FSEL_26_MHZ_VAL			(0x3)
> +#define FSEL_48_MHZ_VAL			(0x2)
> +
> +#define EXYNOS_USB_PHY_CFG_PLLCFG0	(0x8)
> +#define PHY_CFG_PLL_FB_DIV_19_8_MASK	GENMASK(19, 8)
> +#define DIV_19_8_19_2_MHZ_VAL		(0x170)
> +#define DIV_19_8_20_MHZ_VAL		(0x160)
> +#define DIV_19_8_24_MHZ_VAL		(0x120)
> +#define DIV_19_8_26_MHZ_VAL		(0x107)
> +#define DIV_19_8_48_MHZ_VAL		(0x120)
> +
> +#define EXYNOS_USB_PHY_CFG_PLLCFG1	(0xc)
> +#define EXYNOS_PHY_CFG_PLL_FB_DIV_11_8_MASK	GENMASK(11, 8)
> +#define EXYNOS_DIV_11_8_19_2_MHZ_VAL	(0x0)
> +#define EXYNOS_DIV_11_8_20_MHZ_VAL	(0x0)
> +#define EXYNOS_DIV_11_8_24_MHZ_VAL	(0x0)
> +#define EXYNOS_DIV_11_8_26_MHZ_VAL	(0x0)
> +#define EXYNOS_DIV_11_8_48_MHZ_VAL	(0x1)
> +
> +#define EXYNOS_PHY_CFG_TX		(0x14)
> +#define EXYNOS_PHY_CFG_TX_FSLS_VREF_TUNE_MASK	GENMASK(2, 1)
> +
> +#define EXYNOS_USB_PHY_UTMI_TESTSE	(0x20)
> +#define TEST_IDDQ			BIT(6)
> +
>  #define QCOM_USB_PHY_UTMI_CTRL0		(0x3c)
>  #define SLEEPM				BIT(0)
>  #define OPMODE_MASK			GENMASK(4, 3)
> @@ -196,6 +229,93 @@ static void qcom_eusb2_default_parameters(struct snps_eusb2_hsphy *phy)
>  				    FIELD_PREP(PHY_CFG_TX_HS_XV_TUNE_MASK, 0x0));
>  }
>  
> +static int exynos_eusb2_ref_clk_init(struct snps_eusb2_hsphy *phy)
> +{
> +	unsigned long ref_clk_freq = clk_get_rate(phy->ref_clk);
> +
> +	switch (ref_clk_freq) {
> +	case 19200000:
> +		snps_eusb2_hsphy_write_mask(phy->base, EXYNOS_USB_PHY_HS_PHY_CTRL_COMMON,
> +					    FSEL_MASK,
> +					    FIELD_PREP(FSEL_MASK, FSEL_19_2_MHZ_VAL));
> +

Could you please unify the switchcase? assign the values to temp
variables, then program them from a single code stream. Or maybe even
replace switch-case with a table-based lookup.

(we probably should implement the similar change for qcom part. Maybe
you can refactor it too?)

Other than that LGTM.

> +		snps_eusb2_hsphy_write_mask(phy->base, EXYNOS_USB_PHY_CFG_PLLCFG0,
> +					    PHY_CFG_PLL_FB_DIV_19_8_MASK,
> +					    FIELD_PREP(PHY_CFG_PLL_FB_DIV_19_8_MASK,
> +						       DIV_19_8_19_2_MHZ_VAL));
> +
> +		snps_eusb2_hsphy_write_mask(phy->base, EXYNOS_USB_PHY_CFG_PLLCFG1,
> +					    EXYNOS_PHY_CFG_PLL_FB_DIV_11_8_MASK,
> +					    EXYNOS_DIV_11_8_19_2_MHZ_VAL);
> +		break;
> +
> +	case 20000000:
> +		snps_eusb2_hsphy_write_mask(phy->base, EXYNOS_USB_PHY_HS_PHY_CTRL_COMMON,
> +					    FSEL_MASK,
> +					    FIELD_PREP(FSEL_MASK, FSEL_20_MHZ_VAL));
> +
> +		snps_eusb2_hsphy_write_mask(phy->base, EXYNOS_USB_PHY_CFG_PLLCFG0,
> +					    PHY_CFG_PLL_FB_DIV_19_8_MASK,
> +					    FIELD_PREP(PHY_CFG_PLL_FB_DIV_19_8_MASK,
> +						       DIV_19_8_20_MHZ_VAL));
> +
> +		snps_eusb2_hsphy_write_mask(phy->base, EXYNOS_USB_PHY_CFG_PLLCFG1,
> +					    EXYNOS_PHY_CFG_PLL_FB_DIV_11_8_MASK,
> +					    EXYNOS_DIV_11_8_20_MHZ_VAL);
> +		break;
> +

-- 
With best wishes
Dmitry