From nobody Wed Nov 27 18:28:28 2024 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B6931C1AAE; Tue, 8 Oct 2024 10:29:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383393; cv=none; b=D4wgrWuoqoVSy8JDiTGkJBACRyJIkFS1k/zOKBdp6cvG0fUGG5EGHZJSBAksZgE6f6ABP1ElCVAkyd8TAVDiZi5HOiSXUSgDouiIuWa8K1VTaQZHeBHJeCefUX8gdWBH37RKiIfoGYXs1Yii85Kt13zyD+dn52yKwOXARoo4RJw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383393; c=relaxed/simple; bh=E8U5ywKHA7RII0hZ6fp0xnBM2/duucRWxOJaacJLjjs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=l026RscLRbiRZk4wG+kiBgTj1TT3h0cZueW2ql2nQyMV6YVZHtiiCWdPFv7gl6RNOgewpCDnZyAPwIKxpwUlRjYuyElPKTiX+EYpI3wPKBVrSkec0bnk+4IuJaHl/ZijewFpvP1+6k8TgefXfOiEHORQ3W8vu015Spn1sYdY328= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=gysUT255; arc=none smtp.client-ip=217.70.183.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="gysUT255" Received: by mail.gandi.net (Postfix) with ESMTPSA id 0A543E0009; Tue, 8 Oct 2024 10:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1728383383; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TR8qB9Wj3SH6OZiX7hyLNJZLZAv2j1QAmz9eBH+4ZT0=; b=gysUT255hTlgRdYTsqiTXxRtEKvdsAtbZDl+JUWBOYfD0+i+syghFsYTHB9P9Pz9pkrseg PRYZQCA1qHF0Q/Pz+ntU8HcLSq2itFv+bdK5Yhec9qkpbKNKzU6WZUQ6TVoPabX/gqekzK be1BwZo1g+/SM8QSFocOA5EpcB+sokifUCNG6Dn1DOoW98A9YYtDO4hKGA1Axb6wZaKJWG hRyyMjyjjZSE9J2nIb8igUfXujQ+dB/BaJFlrwhv6qiqq9FRqwIgTxyLyfeSAXherYPTdU w4mXnv9ctMW4C+3HJs+Yi8pWdzKYPhYTKFZIZqkSl+XR/MXcOqnr+LmY265I+g== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Tue, 08 Oct 2024 12:29:40 +0200 Subject: [PATCH 1/4] dt-bindings: i2c: nomadik: add mobileye,eyeq6h-i2c bindings Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241008-mbly-i2c-v1-1-a06c1317a2f7@bootlin.com> References: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> In-Reply-To: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> To: Linus Walleij , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladimir Kondratiev , =?utf-8?q?Gr=C3=A9gory_Clement?= , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.14.2 X-GND-Sasl: theo.lebrun@bootlin.com After EyeQ5, it is time for Mobileye EyeQ6H to reuse the Nomadik I2C controller. Add a specific compatible because its HW integration is slightly different from EyeQ5. Do NOT add an example as it looks like EyeQ5 from a DT standpoint (without the mobileye,olb property). Signed-off-by: Th=C3=A9o Lebrun --- Documentation/devicetree/bindings/i2c/st,nomadik-i2c.yaml | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/i2c/st,nomadik-i2c.yaml b/Do= cumentation/devicetree/bindings/i2c/st,nomadik-i2c.yaml index 44c54b162bb10741ec7aac70d165403c28176eba..72ecb6efa733f7878bd807df277= bfc13153bf71e 100644 --- a/Documentation/devicetree/bindings/i2c/st,nomadik-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/st,nomadik-i2c.yaml @@ -22,6 +22,7 @@ select: enum: - st,nomadik-i2c - mobileye,eyeq5-i2c + - mobileye,eyeq6h-i2c required: - compatible =20 @@ -38,6 +39,9 @@ properties: - items: - const: mobileye,eyeq5-i2c - const: arm,primecell + - items: + - const: mobileye,eyeq6h-i2c + - const: arm,primecell =20 reg: maxItems: 1 @@ -54,7 +58,7 @@ properties: - items: - const: mclk - const: apb_pclk - # Clock name in DB8500 or EyeQ5 + # Clock name in DB8500 or EyeQ - items: - const: i2cclk - const: apb_pclk --=20 2.46.2 From nobody Wed Nov 27 18:28:28 2024 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C95FB1C1745; Tue, 8 Oct 2024 10:29:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383394; cv=none; b=Jy8R8VRYqyulW0EYKd8FEn5i5U5m9hBmo4kATjHtojotxSCvXGGhKnS8NNsM+LxiA+uXIQr4QVbRlB3wWh9bRXr2nlx6HXRTt8pRxPu3qlS8qB71LHIZy4gCDckNo7yGyhc7Q8hRpZPPWIeLzpWn6FOHd9wpEqLiMb4V3ZWf4QA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383394; c=relaxed/simple; bh=I2Stt0MS2ZA3zwuO5y5wV2zeuA+3MTgcPN8X0D5FW3o=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=dBwpmuW6Vy8iabwDmZD936bvwiKo7XEOLTEjdax0IMeGP/R0thxH4ubBfASX23A0HglET2lSQZBX+uqVmKyxbF92BBHXpsIpXc1kTPYmx4vf36MCqMmUxFG04FtjULa94uW1XiR/5PtmnxFXPanRCrJJVoKu9h5YDTG5GGYM2mw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=Z7uD+DCK; arc=none smtp.client-ip=217.70.183.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="Z7uD+DCK" Received: by mail.gandi.net (Postfix) with ESMTPSA id AFA76E0002; Tue, 8 Oct 2024 10:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1728383384; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PtMmHbPZ23pwesmORM0pCnGzFJGwj7VpWxVSSzjsLkQ=; b=Z7uD+DCK6v4FGhL99TUZKfwrJsnhkqG0UVklqLvkNggxE3Tcpyd1ndQ24xFqjANZZEECjn oKq7L1SwWTZuNfX2uGb6e+dzTjbpEByx3xZqnQ0NhWTdlXFG70uUeYrEdVDEowJbvNDEas xrn8WGlP8+RYZYsCgEMc5z1yFJHAa2QTySSj4kvsKqz8zLN9drSft3vFlee2Tcae3HsjYb 9/imEtE6hfw8KPK5eRH9hTg6tbAhrvRuBMel2fX+mSw3u4Tyd90GMHm9vjWBxgbkXS0/jE GLjkAio7LAR7VMjHsPtQvFtg6sci/z0GupRVmfBKh8bTu0kTO2inc/49maQ25A== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Tue, 08 Oct 2024 12:29:41 +0200 Subject: [PATCH 2/4] i2c: nomadik: support Mobileye EyeQ6H I2C controller Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241008-mbly-i2c-v1-2-a06c1317a2f7@bootlin.com> References: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> In-Reply-To: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> To: Linus Walleij , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladimir Kondratiev , =?utf-8?q?Gr=C3=A9gory_Clement?= , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.14.2 X-GND-Sasl: theo.lebrun@bootlin.com Add EyeQ6H support to the nmk-i2c AMBA driver. It shares the same quirk as EyeQ5: the memory bus only supports 32-bit accesses. Avoid writeb() and readb() by reusing the same `priv->has_32b_bus` flag. It does NOT need to write speed-mode specific value into a register; therefore it does not depend on the mobileye,olb DT property. Refactoring is done using is_eyeq5 and is_eyeq6h boolean local variables. Sort variables in reverse christmas tree to try and introduce some logic into the ordering. Signed-off-by: Th=C3=A9o Lebrun --- drivers/i2c/busses/i2c-nomadik.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-noma= dik.c index ad0f02acdb1215a1c04729f97bb14a4d93f88456..ea511d3a58073eaedb63850026e= 05b59427a69c6 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -6,10 +6,10 @@ * I2C master mode controller driver, used in Nomadik 8815 * and Ux500 platforms. * - * The Mobileye EyeQ5 platform is also supported; it uses + * The Mobileye EyeQ5 and EyeQ6H platforms are also supported; they use * the same Ux500/DB8500 IP block with two quirks: * - The memory bus only supports 32-bit accesses. - * - A register must be configured for the I2C speed mode; + * - (only EyeQ5) A register must be configured for the I2C speed mode; * it is located in a shared register region called OLB. * * Author: Srinidhi Kasagar @@ -1046,8 +1046,6 @@ static int nmk_i2c_eyeq5_probe(struct nmk_i2c_dev *pr= iv) struct regmap *olb; unsigned int id; =20 - priv->has_32b_bus =3D true; - olb =3D syscon_regmap_lookup_by_phandle_args(np, "mobileye,olb", 1, &id); if (IS_ERR(olb)) return PTR_ERR(olb); @@ -1070,13 +1068,15 @@ static int nmk_i2c_eyeq5_probe(struct nmk_i2c_dev *= priv) =20 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *i= d) { - int ret =3D 0; - struct nmk_i2c_dev *priv; - struct device_node *np =3D adev->dev.of_node; - struct device *dev =3D &adev->dev; - struct i2c_adapter *adap; struct i2c_vendor_data *vendor =3D id->data; + struct device_node *np =3D adev->dev.of_node; + bool is_eyeq6h =3D of_device_is_compatible(np, "mobileye,eyeq6h-i2c"); + bool is_eyeq5 =3D of_device_is_compatible(np, "mobileye,eyeq5-i2c"); u32 max_fifo_threshold =3D (vendor->fifodepth / 2) - 1; + struct device *dev =3D &adev->dev; + struct nmk_i2c_dev *priv; + struct i2c_adapter *adap; + int ret =3D 0; =20 priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) @@ -1084,10 +1084,10 @@ static int nmk_i2c_probe(struct amba_device *adev, = const struct amba_id *id) =20 priv->vendor =3D vendor; priv->adev =3D adev; - priv->has_32b_bus =3D false; + priv->has_32b_bus =3D is_eyeq5 || is_eyeq6h; nmk_i2c_of_probe(np, priv); =20 - if (of_device_is_compatible(np, "mobileye,eyeq5-i2c")) { + if (is_eyeq5) { ret =3D nmk_i2c_eyeq5_probe(priv); if (ret) return dev_err_probe(dev, ret, "failed OLB lookup\n"); --=20 2.46.2 From nobody Wed Nov 27 18:28:28 2024 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4AF6D1C1AC8; Tue, 8 Oct 2024 10:29:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383394; cv=none; b=bNofcTbYoJGLzckvNDGlmb2jc/BLIcCnwMK5/3rSBNcv76RKMReAlwDMTpNDPjwBV3mTrBZKkFWQolGtiEdRo9O5LXMoqvtNqoJ9Q5gDxnkzfSk4iyGAuFJ+BfZocTNqRueikvlvoPmfzRi+rDju75qamKbGWF4Uw5LIFUz8X4Y= ARC-Message-Signature: i=1; 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Tue, 8 Oct 2024 10:29:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1728383385; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hk/cnPLhu0UgkHduMRy01DxcYt4eJaBLwDUFI+yCrVI=; b=FQ20dmegjSaQ0cuGROfvuBqxrPgvwwm998u4x+bVCjBMgeqNYmJnkSiNB5AHzWRJ5P3l5v hIZ3ZAfjPUbgOgo3pPuNUsNFejFjXrMu2e3/9Uqa3vEwpCwP/qqDhwm09GGv/HSd4QMx41 enUmKl1d3JAhTQAp5MPH/XNj+rxWXEijbb+lBuwajx87d7N1K4P87q/BuGIPtCFJCRApUq qTfe4Y5nUy6QU+8Mfq+DY2TVJA2rwAlHiDZiYEaymf8FSQWOPyh4SWjLYzAPTP3I5BXpKW 87kOhmghC+M1gfbAprfzj5kph1ctzGChnTzU/MzZn07MaQqfcl7Z6zdjvcFJ0A== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Tue, 08 Oct 2024 12:29:42 +0200 Subject: [PATCH 3/4] i2c: nomadik: fix BRCR computation Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241008-mbly-i2c-v1-3-a06c1317a2f7@bootlin.com> References: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> In-Reply-To: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> To: Linus Walleij , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladimir Kondratiev , =?utf-8?q?Gr=C3=A9gory_Clement?= , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.14.2 X-GND-Sasl: theo.lebrun@bootlin.com Current BRCR computation is: brcr =3D floor(i2cclk / (clkfreq * div)) With brcr: "baud rate counter", an internal clock divider, and i2cclk: input clock rate (24MHz, 38.4MHz or 48MHz), and clkfreq: desired bus rate, and div: speed-mode dependent divider (2 for standard, 3 otherwise). Assume i2cclk=3D48MHz, clkfreq=3D3.4MHz, div=3D3, then brcr =3D floor(48MHz / (3.4MHz * 3)) =3D 4 and resulting bus rate =3D 48MHz / (4 * 3) =3D 4MHz Assume i2cclk=3D38.4MHz, clkfreq=3D1.0MHz, div=3D3, then brcr =3D floor(38.4MHz / (1.0MHz * 3)) =3D 12 and resulting bus rate =3D 38.4MHz / (12 * 3) =3D 1066kHz The current computation means we always pick the smallest divider that gives a bus rate above target. We should instead pick the largest divider that gives a bus rate below target, using: brcr =3D floor(i2cclk / (clkfreq * div)) + 1 If we redo the above examples: Assume i2cclk=3D48MHz, clkfreq=3D3.4MHz, div=3D3, then brcr =3D floor(48MHz / (3.4MHz * 3)) + 1 =3D 5 and resulting bus rate =3D 48MHz / (5 * 3) =3D 3.2MHz Assume i2cclk=3D38.4MHz, clkfreq=3D1.0MHz, div=3D3, then brcr =3D floor(38.4MHz / (1.0MHz * 3)) + 1 =3D 13 and resulting bus rate =3D 38.4MHz / (13 * 3) =3D 985kHz This is much less of an issue with slower bus rates (ie those currently supported), because the gap from one divider to the next is much smaller. It however keeps us from always using bus rates superior to the target. This fix is required for later on supporting faster bus rates: I2C_FREQ_MODE_FAST_PLUS (1MHz) and I2C_FREQ_MODE_HIGH_SPEED (3.4MHz). Signed-off-by: Th=C3=A9o Lebrun --- drivers/i2c/busses/i2c-nomadik.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-noma= dik.c index ea511d3a58073eaedb63850026e05b59427a69c6..68ce39352d67477fa22424e2dc0= f8d1741498cd1 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -453,9 +453,12 @@ static void setup_i2c_controller(struct nmk_i2c_dev *p= riv) * operation, and the other is for std, fast mode, fast mode * plus operation. Currently we do not supprt high speed mode * so set brcr1 to 0. + * + * BRCR is a clock divider amount. Pick highest value that + * leads to rate strictly below target. */ brcr1 =3D FIELD_PREP(I2C_BRCR_BRCNT1, 0); - brcr2 =3D FIELD_PREP(I2C_BRCR_BRCNT2, i2c_clk / (priv->clk_freq * div)); + brcr2 =3D FIELD_PREP(I2C_BRCR_BRCNT2, i2c_clk / (priv->clk_freq * div) + = 1); =20 /* set the baud rate counter register */ writel((brcr1 | brcr2), priv->virtbase + I2C_BRCR); --=20 2.46.2 From nobody Wed Nov 27 18:28:28 2024 Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 57503192B6F; Tue, 8 Oct 2024 10:29:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383395; cv=none; b=LwePZwJwDovqoXc7RqJzLmHBiRPsWqCE3s6BDxYQ0/q/4Mqq3+IIPhN8jcjurh4L8gUSmTzSL8nptOf2gJmZbA3ll3QXBLNc8AVPaaCd07Kf+QwLjyVdLKaj2wlCXWpT9qNpF70cqpXBBUS7tr0b2w9u/MyXTekZ1Y55gKFNUJ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728383395; c=relaxed/simple; bh=5a0Oxf7lFMAgi2SILZFtB1/bra4shl5qEpwMA/a01jk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=LH7WRCyjmmIXzj8Hd8dtH1yehfa/xys6R5sAeZFR1PdD28qk96C6DA/5ziFeW3J2MQkF+zI5U/9gEPs2bqYSj54MEc8SYVmxp3rNYO+A+iJhF6zPt2VSfe5iQCMCAmi9HPCwoRvUaXZq3GDLdO3Zt8u8AsEXA7iej4yb0GyATbc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=ldUoZrFe; arc=none smtp.client-ip=217.70.183.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="ldUoZrFe" Received: by mail.gandi.net (Postfix) with ESMTPSA id 45EEEE000D; Tue, 8 Oct 2024 10:29:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1728383385; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ANQX8H7crnEHXkyTrpbWnxCPQMuaKFHhdRyusFeiLjE=; b=ldUoZrFei8MWb9I7J39PmFVdEQubxARTCjr9daNCIvTUXc18GUm0WZnEr1qCPG83UXGMmY mNdWfc64N3H57bgBsq+hCv/AjRPAZsAJiVggLUfoOSRBTRzrxDuFDIihgfXWKfSp+lS7FQ +lPc3Pyiib3wGbUZGgpvRIawbvt/ZFYkq3VhJ5Hgqu+fQFijIB3BiE+ywpgoS0CVw5PuTX 3x5t1lS3SvY8ECgJkfDmpZr7tBJSexZmo2wIORGMVEfASUWuegIHlqEzZmPQ4Ry30II2Qw hZnlJ5o6sGI8ggVF8jT2K6sC6p9olLZAcbvsont0B/4jDwm0ojcFIApuG21JjQ== From: =?utf-8?q?Th=C3=A9o_Lebrun?= Date: Tue, 08 Oct 2024 12:29:43 +0200 Subject: [PATCH 4/4] i2c: nomadik: support >=1MHz speed modes Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241008-mbly-i2c-v1-4-a06c1317a2f7@bootlin.com> References: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> In-Reply-To: <20241008-mbly-i2c-v1-0-a06c1317a2f7@bootlin.com> To: Linus Walleij , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vladimir Kondratiev , =?utf-8?q?Gr=C3=A9gory_Clement?= , Thomas Petazzoni , Tawfik Bayouk , =?utf-8?q?Th=C3=A9o_Lebrun?= X-Mailer: b4 0.14.2 X-GND-Sasl: theo.lebrun@bootlin.com - BRCR value must go into the BRCR1 field when in high-speed mode. It goes into BRCR2 otherwise. - Remove fallback to standard mode if priv->sm > I2C_FREQ_MODE_FAST. - Set SM properly in probe; previously it only checked STANDARD versus FAST. Now we set STANDARD, FAST, FAST_PLUS or HIGH_SPEED. - Remove all comment sections saying we only support low-speeds. Signed-off-by: Th=C3=A9o Lebrun --- drivers/i2c/busses/i2c-nomadik.c | 40 ++++++++++++++++--------------------= ---- 1 file changed, 16 insertions(+), 24 deletions(-) diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-noma= dik.c index 68ce39352d67477fa22424e2dc0f8d1741498cd1..82571983bbca5ebcd8a689d4d71= 7ea96eb3d2ad2 100644 --- a/drivers/i2c/busses/i2c-nomadik.c +++ b/drivers/i2c/busses/i2c-nomadik.c @@ -396,7 +396,7 @@ static u32 load_i2c_mcr_reg(struct nmk_i2c_dev *priv, u= 16 flags) */ static void setup_i2c_controller(struct nmk_i2c_dev *priv) { - u32 brcr1, brcr2; + u32 brcr; u32 i2c_clk, div; u32 ns; u16 slsu; @@ -443,7 +443,7 @@ static void setup_i2c_controller(struct nmk_i2c_dev *pr= iv) /* * The spec says, in case of std. mode the divider is * 2 whereas it is 3 for fast and fastplus mode of - * operation. TODO - high speed support. + * operation. */ div =3D (priv->clk_freq > I2C_MAX_STANDARD_MODE_FREQ) ? 3 : 2; =20 @@ -451,33 +451,22 @@ static void setup_i2c_controller(struct nmk_i2c_dev *= priv) * generate the mask for baud rate counters. The controller * has two baud rate counters. One is used for High speed * operation, and the other is for std, fast mode, fast mode - * plus operation. Currently we do not supprt high speed mode - * so set brcr1 to 0. + * plus operation. * * BRCR is a clock divider amount. Pick highest value that * leads to rate strictly below target. */ - brcr1 =3D FIELD_PREP(I2C_BRCR_BRCNT1, 0); - brcr2 =3D FIELD_PREP(I2C_BRCR_BRCNT2, i2c_clk / (priv->clk_freq * div) + = 1); + brcr =3D i2c_clk / (priv->clk_freq * div) + 1; + + if (priv->sm =3D=3D I2C_FREQ_MODE_HIGH_SPEED) + brcr =3D FIELD_PREP(I2C_BRCR_BRCNT1, brcr); + else + brcr =3D FIELD_PREP(I2C_BRCR_BRCNT2, brcr); =20 /* set the baud rate counter register */ - writel((brcr1 | brcr2), priv->virtbase + I2C_BRCR); + writel(brcr, priv->virtbase + I2C_BRCR); =20 - /* - * set the speed mode. Currently we support - * only standard and fast mode of operation - * TODO - support for fast mode plus (up to 1Mb/s) - * and high speed (up to 3.4 Mb/s) - */ - if (priv->sm > I2C_FREQ_MODE_FAST) { - dev_err(&priv->adev->dev, - "do not support this mode defaulting to std. mode\n"); - brcr2 =3D FIELD_PREP(I2C_BRCR_BRCNT2, - i2c_clk / (I2C_MAX_STANDARD_MODE_FREQ * 2)); - writel((brcr1 | brcr2), priv->virtbase + I2C_BRCR); - writel(FIELD_PREP(I2C_CR_SM, I2C_FREQ_MODE_STANDARD), - priv->virtbase + I2C_CR); - } + /* set the speed mode */ writel(FIELD_PREP(I2C_CR_SM, priv->sm), priv->virtbase + I2C_CR); =20 /* set the Tx and Rx FIFO threshold */ @@ -1018,11 +1007,14 @@ static void nmk_i2c_of_probe(struct device_node *np, if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq)) priv->clk_freq =3D I2C_MAX_STANDARD_MODE_FREQ; =20 - /* This driver only supports 'standard' and 'fast' modes of operation. */ if (priv->clk_freq <=3D I2C_MAX_STANDARD_MODE_FREQ) priv->sm =3D I2C_FREQ_MODE_STANDARD; - else + else if (priv->clk_freq <=3D I2C_MAX_FAST_MODE_FREQ) priv->sm =3D I2C_FREQ_MODE_FAST; + else if (priv->clk_freq <=3D I2C_MAX_FAST_MODE_PLUS_FREQ) + priv->sm =3D I2C_FREQ_MODE_FAST_PLUS; + else + priv->sm =3D I2C_FREQ_MODE_HIGH_SPEED; priv->tft =3D 1; /* Tx FIFO threshold */ priv->rft =3D 8; /* Rx FIFO threshold */ =20 --=20 2.46.2