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([82.78.167.28]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3825fbc3a47sm13027694f8f.73.2024.11.26.01.21.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Nov 2024 01:21:22 -0800 (PST) From: Claudiu X-Google-Original-From: Claudiu To: vkoul@kernel.org, kishon@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, p.zabel@pengutronix.de, geert+renesas@glider.be, magnus.damm@gmail.com, gregkh@linuxfoundation.org, yoshihiro.shimoda.uh@renesas.com, christophe.jaillet@wanadoo.fr Cc: linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-usb@vger.kernel.org, claudiu.beznea@tuxon.dev, Claudiu Beznea Subject: [PATCH v2 10/15] phy: renesas: rcar-gen3-usb2: Add support for PWRRDY Date: Tue, 26 Nov 2024 11:20:45 +0200 Message-Id: <20241126092050.1825607-11-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20241126092050.1825607-1-claudiu.beznea.uj@bp.renesas.com> References: <20241126092050.1825607-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea On the Renesas RZ/G3S SoC, the USB PHY has an input signal called PWRRDY. This signal is managed by the system controller and must be de-asserted after powering on the area where USB PHY resides and asserted before powering it off. The connection b/w the system controller and the USB PHY is implemented through the renesas,sysc-signal device tree property. This property specifies the register offset and the bitmask required to control the signal. The system controller exports the syscon regmap, and the read/write access to the memory area of the PWRRDY signal is reference-counted, as the same system controller signal is connected to both RZ/G3S USB PHYs. Add support for the PWRRDY signal control. Signed-off-by: Claudiu Beznea --- Changes in v2: - none; this patch is new drivers/phy/renesas/phy-rcar-gen3-usb2.c | 66 ++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c index 59f74aa993ac..84459755adf5 100644 --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c @@ -12,12 +12,14 @@ #include #include #include +#include #include #include #include #include #include #include +#include #include #include #include @@ -111,6 +113,12 @@ struct rcar_gen3_phy { bool powered; }; +struct rcar_gen3_pwrrdy { + struct regmap *regmap; + u32 offset; + u32 mask; +}; + struct rcar_gen3_chan { void __iomem *base; struct device *dev; /* platform_device's device */ @@ -118,6 +126,7 @@ struct rcar_gen3_chan { struct rcar_gen3_phy rphys[NUM_OF_PHYS]; struct regulator *vbus; struct reset_control *rstc; + struct rcar_gen3_pwrrdy *pwrrdy; struct work_struct work; struct mutex lock; /* protects rphys[...].powered */ enum usb_dr_mode dr_mode; @@ -133,6 +142,7 @@ struct rcar_gen3_phy_drv_data { const struct phy_ops *phy_usb2_ops; bool no_adp_ctrl; bool init_bus; + bool pwrrdy; }; /* @@ -587,6 +597,7 @@ static const struct rcar_gen3_phy_drv_data rz_g3s_phy_usb2_data = { .phy_usb2_ops = &rcar_gen3_phy_usb2_ops, .no_adp_ctrl = true, .init_bus = true, + .pwrrdy = true, }; static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = { @@ -707,6 +718,55 @@ static int rcar_gen3_phy_usb2_init_bus(struct rcar_gen3_chan *channel) return ret; } +static void rcar_gen3_phy_usb2_set_pwrrdy(struct rcar_gen3_chan *channel, bool power_on) +{ + struct rcar_gen3_pwrrdy *pwrrdy = channel->pwrrdy; + + /* N/A on this platform. */ + if (!pwrrdy) + return; + + regmap_update_bits(pwrrdy->regmap, pwrrdy->offset, pwrrdy->mask, !power_on); +} + +static void rcar_gen3_phy_usb2_pwrrdy_off(void *data) +{ + rcar_gen3_phy_usb2_set_pwrrdy(data, false); +} + +static int rcar_gen3_phy_usb2_init_pwrrdy(struct rcar_gen3_chan *channel) +{ + struct device *dev = channel->dev; + struct rcar_gen3_pwrrdy *pwrrdy; + struct of_phandle_args args; + int ret; + + pwrrdy = devm_kzalloc(dev, sizeof(*pwrrdy), GFP_KERNEL); + if (!pwrrdy) + return -ENOMEM; + + ret = of_parse_phandle_with_args(dev->of_node, "renesas,sysc-signal", + "#renesas,sysc-signal-cells", 0, &args); + if (ret) + return ret; + + pwrrdy->regmap = syscon_node_to_regmap(args.np); + pwrrdy->offset = args.args[0]; + pwrrdy->mask = args.args[1]; + + of_node_put(args.np); + + if (IS_ERR(pwrrdy->regmap)) + return PTR_ERR(pwrrdy->regmap); + + channel->pwrrdy = pwrrdy; + + /* Power it ON. */ + rcar_gen3_phy_usb2_set_pwrrdy(channel, true); + + return devm_add_action_or_reset(dev, rcar_gen3_phy_usb2_pwrrdy_off, channel); +} + static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev) { const struct rcar_gen3_phy_drv_data *phy_data; @@ -763,6 +823,12 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev) platform_set_drvdata(pdev, channel); channel->dev = dev; + if (phy_data->pwrrdy) { + ret = rcar_gen3_phy_usb2_init_pwrrdy(channel); + if (ret) + goto error; + } + if (phy_data->init_bus) { ret = rcar_gen3_phy_usb2_init_bus(channel); if (ret)