From patchwork Thu Dec 22 04:18:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geoff Lansberry X-Patchwork-Id: 9484229 X-Patchwork-Delegate: sameo@linux.intel.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6FCBF601D3 for ; Thu, 22 Dec 2016 04:19:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61F4028135 for ; Thu, 22 Dec 2016 04:19:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 55D38283F7; Thu, 22 Dec 2016 04:19:34 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B4C9C28135 for ; Thu, 22 Dec 2016 04:19:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933992AbcLVETV (ORCPT ); Wed, 21 Dec 2016 23:19:21 -0500 Received: from mail-qk0-f182.google.com ([209.85.220.182]:36379 "EHLO mail-qk0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933661AbcLVETT (ORCPT ); Wed, 21 Dec 2016 23:19:19 -0500 Received: by mail-qk0-f182.google.com with SMTP id n21so97343421qka.3 for ; Wed, 21 Dec 2016 20:19:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kuvee-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Mx3bdsj5dArpBzX+4Jupqvy78OjUFEIjXSdJCUQfS9M=; b=1wYo1DLvhlPc7kd2qsnsrlQf3uf8tP3mVQsQmMNnlOcd6XCE8xayIK1yotJgjYLeMV q7zDsH+g1/lkdS/RozZ4THJtxMp/Z0AjuolNbCjNDN6cyh18Qnkg6/dI5FnWTB+2YfPp rLzUxzkMFyyjbR+zcghmskr4gJFBDnOqoEKXuNAAy5UQG8oLPnLv+UbjPsye5/zOSjh8 rR7a759hYzgCS9Mky1ltwcawcz68clo0L+/tv+ohVqhJpoMwC1zCZnX3HamBm72zbphz mEN6m9VhTx3vPXJJHn5sCo9jQn6h3ri88CJpH0WwSxtdUstJSbdDYy+v8T+FtfJTMFbI cc2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Mx3bdsj5dArpBzX+4Jupqvy78OjUFEIjXSdJCUQfS9M=; b=a7n9Dg2qyQ3jYztabqP3UiqaildGtlgVCZtP3BMEN03q1EFi79VukoKxNJrXWHeB8t YCGK0EC6QVvFp+E5q9ZuB9h6FXN2rOnbuNAK874CaKGRypsdri6siD3vYvN86KulrfSp jY6CH/gV3g54ZrhEjsBwpMOYySE+KxN21rySGRg2YWD1q6N7niNFkeRoR174fSMPQ5GH it7YTJD3fpkF2OcaBlgxVN4JtssHM4k9YUawIFZuCyceVpHahgSLvOOMQ20cgxWBAYdJ Ie/HGI4VoFZ2ngWDbBWsfnHuRZEyFAtX+I3AS+kyJWO4DXzOJ7YuZXty19/EJ6ScuM9O dtWg== X-Gm-Message-State: AIkVDXISOqKdC0wEZc3vQkdgcJXhqkTEAbsRuZ4IWCCWQuoOSkhF9oY9H3Y4PBbVvumqFA== X-Received: by 10.55.72.141 with SMTP id v135mr6445448qka.50.1482380358849; Wed, 21 Dec 2016 20:19:18 -0800 (PST) Received: from localhost.localdomain (pool-108-20-204-117.bstnma.fios.verizon.net. [108.20.204.117]) by smtp.googlemail.com with ESMTPSA id o190sm17141995qke.5.2016.12.21.20.19.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 21 Dec 2016 20:19:18 -0800 (PST) From: Geoff Lansberry To: linux-wireless@vger.kernel.org Cc: lauro.venancio@openbossa.org, aloisio.almeida@openbossa.org, sameo@linux.intel.com, robh+dt@kernel.org, mark.rutland@arm.com, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, mgreer@animalcreek.com, justin@kuvee.com, Geoff Lansberry Subject: [PATCH v3 2/3] NFC: trf7970a: Add device tree option of 1.8 Volt IO voltage Date: Wed, 21 Dec 2016 23:18:33 -0500 Message-Id: <1482380314-16440-2-git-send-email-geoff@kuvee.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1482380314-16440-1-git-send-email-geoff@kuvee.com> References: <1482380314-16440-1-git-send-email-geoff@kuvee.com> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The TRF7970A has configuration options for supporting hardware designs with 1.8 Volt or 3.3 Volt IO. This commit adds a device tree option, using a fixed regulator binding, for setting the io voltage to match the hardware configuration. If no option is supplied it defaults to 3.3 volt configuration. Signed-off-by: Geoff Lansberry Acked-by: Rob Herring Acked-by: Mark Greer --- .../devicetree/bindings/net/nfc/trf7970a.txt | 2 ++ drivers/nfc/trf7970a.c | 26 +++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt index 8b01fc81..b5777d8 100644 --- a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt +++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt @@ -21,6 +21,7 @@ Optional SoC Specific Properties: - t5t-rmb-extra-byte-quirk: Specify that the trf7970a has the erratum where an extra byte is returned by Read Multiple Block commands issued to Type 5 tags. +- vdd-io-supply: Regulator specifying voltage for vdd-io - clock-frequency: Set to specify that the input frequency to the trf7970a is 13560000Hz or 27120000Hz Example (for ARM-based BeagleBone with TRF7970A on SPI1): @@ -40,6 +41,7 @@ Example (for ARM-based BeagleBone with TRF7970A on SPI1): <&gpio2 5 GPIO_ACTIVE_LOW>; vin-supply = <&ldo3_reg>; vin-voltage-override = <5000000>; + vdd-io-supply = <&ldo2_reg>; autosuspend-delay = <30000>; irq-status-read-quirk; en2-rf-quirk; diff --git a/drivers/nfc/trf7970a.c b/drivers/nfc/trf7970a.c index b1cd4ef..e3c72c6 100644 --- a/drivers/nfc/trf7970a.c +++ b/drivers/nfc/trf7970a.c @@ -444,6 +444,7 @@ struct trf7970a { u8 iso_ctrl_tech; u8 modulator_sys_clk_ctrl; u8 special_fcn_reg1; + u8 io_ctrl; unsigned int guard_time; int technology; int framing; @@ -1051,6 +1052,11 @@ static int trf7970a_init(struct trf7970a *trf) if (ret) goto err_out; + ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, + trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); + if (ret) + goto err_out; + ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0); if (ret) goto err_out; @@ -1767,7 +1773,7 @@ static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout, goto out_err; ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL, - TRF7970A_REG_IO_CTRL_VRS(0x1)); + trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1)); if (ret) goto out_err; @@ -2105,6 +2111,24 @@ static int trf7970a_probe(struct spi_device *spi) if (uvolts > 4000000) trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3; + trf->regulator = devm_regulator_get(&spi->dev, "vdd-io"); + if (IS_ERR(trf->regulator)) { + ret = PTR_ERR(trf->regulator); + dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret); + goto err_destroy_lock; + } + + ret = regulator_enable(trf->regulator); + if (ret) { + dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret); + goto err_destroy_lock; + } + + if (regulator_get_voltage(trf->regulator) == 1800000) { + trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW; + dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n"); + } + trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops, TRF7970A_SUPPORTED_PROTOCOLS, NFC_DIGITAL_DRV_CAPS_IN_CRC |