From patchwork Fri Jun 17 13:07:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kavyasree Kotagiri X-Patchwork-Id: 12885702 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6C408C43334 for ; Fri, 17 Jun 2022 13:09:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=TZbWKR4hIlA7aipzIhjQsnTYMicTwoyAquOeVaCIZXY=; b=ZW22E6W2JDz+2q 7G84lek2v3m7zuatyiOBUJAMrpBLNh6UDaeVrwVp0OE4sN4UvfkQg/A3xRkZvcQ0eSyIHyuCrHc7V Z2aHLu2hFtPPNQizFyer7qFPqNA7GLEHoOONXcamH4fvNT4ZXUlyl6LyJBjSNUsHy3Bt5cmhdtnas 5Z3dF4e02Ht+ipwA5y8DOyY+I/E1Wsiiy/z3nEXyz8ZdpBpfVg9qatNjgyIxFdV/NKmPoCLDWEuf0 FTx+BCOlVny/v4QRnHF3J1loGvnlICrPDBmJVWgwDTCiQfJG8zcosX/ZEn2Ma/Ljo0jzKHXm1PPRQ hROq0ESTxOuiaQ8n3eGg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o2BiE-007mJf-VP; Fri, 17 Jun 2022 13:08:35 +0000 Received: from esa.microchip.iphmx.com ([68.232.154.123]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o2Bhj-007m6C-05 for linux-arm-kernel@lists.infradead.org; Fri, 17 Jun 2022 13:08:04 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1655471283; x=1687007283; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=qMlJTGouMGzkJNwKsS+Zb4L98aeIn5YgnhqvcoiSDMY=; b=Lls0zmqU6FMzaLVs59EqYO8qIoF/yCstaJGpexdqssdDJ7fVxxI/c7zQ xbCnhtQo5Ba9pQDfRzuU4CvGre2V0QQO8v7LTpOpAMz/qNuouBwQwZ0qA RE9lD7PJ7VeCNKJXQTPCi6gN1ZeCje8lZLk/0CMifdwkMfUXoacWrhZsA W4/r50TdbAO7VehzsDlKBQzbbIsv5+eZn4toykFrhIxWFWEAk0neYJix6 +2N6lggGOAOiubfKYGp/nG9PqDBdiQjDDcoZpPaVkV7uaynlHu3O84QSa bCNjQSMOHJcAz4HGwrkpPL0TOMO7VtXAwSUADd7M4Z44NclWyx/mT4Yet Q==; X-IronPort-AV: E=Sophos;i="5.92,306,1650956400"; d="scan'208";a="163864329" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa2.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 17 Jun 2022 06:08:02 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Fri, 17 Jun 2022 06:08:02 -0700 Received: from kavya-HP-Compaq-6000-Pro-SFF-PC.microchip.com (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server id 15.1.2375.17 via Frontend Transport; Fri, 17 Jun 2022 06:07:58 -0700 From: Kavyasree Kotagiri To: , , , , CC: , , , Subject: [PATCH v4 3/3] mfd: atmel-flexcom: Add support for lan966x flexcom chip-select configuration Date: Fri, 17 Jun 2022 18:37:29 +0530 Message-ID: <20220617130729.12072-4-kavyasree.kotagiri@microchip.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220617130729.12072-1-kavyasree.kotagiri@microchip.com> References: <20220617130729.12072-1-kavyasree.kotagiri@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220617_060803_185212_30C2D4DF X-CRM114-Status: GOOD ( 19.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org LAN966x SoC have 5 flexcoms. Each flexcom has 2 chip-selects which are optional I/O lines. For each chip select of each flexcom there is a configuration register FLEXCOM_SHARED[0-4]:SS_MASK[0-1]. The width of configuration register is 21 because there are 21 shared pins on each of which the chip select can be mapped. Each bit of the register represents a different FLEXCOM_SHARED pin. Signed-off-by: Kavyasree Kotagiri --- v3 -> v4: - Add condition for a flexcom whether to configure chip-select lines or not, based on "microchip,flx-shrd-pins" property existence because chip-select lines are optional. v2 -> v3: - used goto label for clk_disable in error cases. v1 -> v2: - use GENMASK for mask, macros for maximum allowed values. - use u32 values for flexcom chipselects instead of strings. - disable clock in case of errors. drivers/mfd/atmel-flexcom.c | 94 ++++++++++++++++++++++++++++++++++++- 1 file changed, 93 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c index 33caa4fba6af..430b6783b5a7 100644 --- a/drivers/mfd/atmel-flexcom.c +++ b/drivers/mfd/atmel-flexcom.c @@ -28,15 +28,68 @@ #define FLEX_MR_OPMODE(opmode) (((opmode) << FLEX_MR_OPMODE_OFFSET) & \ FLEX_MR_OPMODE_MASK) +/* LAN966x flexcom shared register offsets */ +#define FLEX_SHRD_SS_MASK_0 0x0 +#define FLEX_SHRD_SS_MASK_1 0x4 +#define FLEX_SHRD_PIN_MAX 20 +#define FLEX_CS_MAX 1 +#define FLEX_SHRD_MASK GENMASK(20, 0) + +struct atmel_flex_caps { + bool has_flx_cs; +}; + struct atmel_flexcom { void __iomem *base; + void __iomem *flexcom_shared_base; u32 opmode; struct clk *clk; }; +static int atmel_flexcom_lan966x_cs_config(struct platform_device *pdev) +{ + struct atmel_flexcom *ddata = dev_get_drvdata(&pdev->dev); + struct device_node *np = pdev->dev.of_node; + u32 flx_shrd_pins[2], flx_cs[2], val; + int err, i, count; + + count = of_property_count_u32_elems(np, "microchip,flx-shrd-pins"); + if (count <= 0 || count > 2) { + dev_err(&pdev->dev, "Invalid %s property (%d)\n", "flx-shrd-pins", + count); + return -EINVAL; + } + + err = of_property_read_u32_array(np, "microchip,flx-shrd-pins", flx_shrd_pins, count); + if (err) + return err; + + err = of_property_read_u32_array(np, "microchip,flx-cs", flx_cs, count); + if (err) + return err; + + for (i = 0; i < count; i++) { + if (flx_shrd_pins[i] > FLEX_SHRD_PIN_MAX) + return -EINVAL; + + if (flx_cs[i] > FLEX_CS_MAX) + return -EINVAL; + + val = ~(1 << flx_shrd_pins[i]) & FLEX_SHRD_MASK; + + if (flx_cs[i] == 0) + writel(val, ddata->flexcom_shared_base + FLEX_SHRD_SS_MASK_0); + else + writel(val, ddata->flexcom_shared_base + FLEX_SHRD_SS_MASK_1); + } + + return 0; +} + static int atmel_flexcom_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; + const struct atmel_flex_caps *caps; struct resource *res; struct atmel_flexcom *ddata; int err; @@ -76,13 +129,52 @@ static int atmel_flexcom_probe(struct platform_device *pdev) */ writel(FLEX_MR_OPMODE(ddata->opmode), ddata->base + FLEX_MR); + caps = of_device_get_match_data(&pdev->dev); + if (!caps) { + dev_err(&pdev->dev, "Could not retrieve flexcom caps\n"); + err = -EINVAL; + goto clk_disable; + } + + if (caps->has_flx_cs && of_property_read_bool(np, "microchip,flx-shrd-pins")) { + ddata->flexcom_shared_base = devm_platform_get_and_ioremap_resource(pdev, 1, NULL); + if (IS_ERR(ddata->flexcom_shared_base)) { + err = dev_err_probe(&pdev->dev, + PTR_ERR(ddata->flexcom_shared_base), + "failed to get flexcom shared base address\n"); + goto clk_disable; + } + + err = atmel_flexcom_lan966x_cs_config(pdev); + if (err) + goto clk_disable; + } + +clk_disable: clk_disable_unprepare(ddata->clk); + if (err) + return err; return devm_of_platform_populate(&pdev->dev); } +static const struct atmel_flex_caps atmel_flexcom_caps = {}; + +static const struct atmel_flex_caps lan966x_flexcom_caps = { + .has_flx_cs = true, +}; + static const struct of_device_id atmel_flexcom_of_match[] = { - { .compatible = "atmel,sama5d2-flexcom" }, + { + .compatible = "atmel,sama5d2-flexcom", + .data = &atmel_flexcom_caps, + }, + + { + .compatible = "microchip,lan966x-flexcom", + .data = &lan966x_flexcom_caps, + }, + { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);