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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Liam Girdwood , Mark Brown , Michael Walle , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Jeremy Kerr , Raymond Hackley , netdev@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 2/2] NFC: nxp-nci: Add pad supply voltage pvdd-supply Message-ID: <20230609154200.3620-1-raymondhackley@protonmail.com> In-Reply-To: <20230609154033.3511-1-raymondhackley@protonmail.com> References: <20230609154033.3511-1-raymondhackley@protonmail.com> Feedback-ID: 49437091:user:proton MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,SPF_HELO_PASS, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1768241441435732038?= X-GMAIL-MSGID: =?utf-8?q?1768241441435732038?= PN547/553, QN310/330 chips on some devices require a pad supply voltage (PVDD). Otherwise, the NFC won't power up. Implement support for pad supply voltage pvdd-supply that is enabled by the nxp-nci driver so that the regulator gets enabled when needed. Signed-off-by: Raymond Hackley --- drivers/nfc/nxp-nci/i2c.c | 42 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c index d4c299be7949..1b8877757cee 100644 --- a/drivers/nfc/nxp-nci/i2c.c +++ b/drivers/nfc/nxp-nci/i2c.c @@ -35,6 +35,7 @@ struct nxp_nci_i2c_phy { struct gpio_desc *gpiod_en; struct gpio_desc *gpiod_fw; + struct regulator *pvdd; int hard_fault; /* * < 0 if hardware error occurred (e.g. i2c err) @@ -263,6 +264,22 @@ static const struct acpi_gpio_mapping acpi_nxp_nci_gpios[] = { { } }; +static void nxp_nci_i2c_poweroff(void *data) +{ + struct nxp_nci_i2c_phy *phy = data; + struct device *dev = &phy->i2c_dev->dev; + struct regulator *pvdd = phy->pvdd; + int r; + + if (!IS_ERR(pvdd) && regulator_is_enabled(pvdd)) { + r = regulator_disable(pvdd); + if (r < 0) + dev_warn(dev, + "Failed to disable regulator pvdd: %d\n", + r); + } +} + static int nxp_nci_i2c_probe(struct i2c_client *client) { struct device *dev = &client->dev; @@ -298,6 +315,29 @@ static int nxp_nci_i2c_probe(struct i2c_client *client) return PTR_ERR(phy->gpiod_fw); } + phy->pvdd = devm_regulator_get_optional(dev, "pvdd"); + if (IS_ERR(phy->pvdd)) { + r = PTR_ERR(phy->pvdd); + if (r != -ENODEV) + return dev_err_probe(dev, r, + "Failed to get regulator pvdd\n"); + } else { + r = regulator_enable(phy->pvdd); + if (r < 0) { + nfc_err(dev, + "Failed to enable regulator pvdd: %d\n", + r); + return r; + } + } + + r = devm_add_action_or_reset(dev, nxp_nci_i2c_poweroff, phy); + if (r < 0) { + nfc_err(dev, "Failed to install poweroff handler: %d\n", + r); + return r; + } + r = nxp_nci_probe(phy, &client->dev, &i2c_phy_ops, NXP_NCI_I2C_MAX_PAYLOAD, &phy->ndev); if (r < 0) @@ -319,6 +359,8 @@ static void nxp_nci_i2c_remove(struct i2c_client *client) nxp_nci_remove(phy->ndev); free_irq(client->irq, phy); + + nxp_nci_i2c_poweroff(phy); } static const struct i2c_device_id nxp_nci_i2c_id_table[] = {