From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0288C2E283E for ; Wed, 15 Oct 2025 10:35:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760524551; cv=none; b=JdCqn+gEF+1U6nLXiNw/1Od7zjcMGmHQs6IIWtGLqm1tkZjcGWBuIc6tx7ihAsQoU+o+TDvPmRQSYDM/A7wM8DvN2oKX/o/I1+zNzixzWOpxIThSEbSX9dNbaWK8wR+5GxFvsEHuuo+uXDxb2KidNMj/mw4HqWMRF7wvkmVmIc8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760524551; c=relaxed/simple; bh=L4wLsqvaNKifFb9kXN1voIWzjV4ev9i8DnZdeTEPjgA=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=IqvXyQ0wKz2bKs8dWMHLVP1nLxx0bsI5YgOm4yQODJKjPMpCPA76IHxvv8TCUmlNx/GOrwol/qcE8YKRotcNM0Qtu6E3NBJcUQ03LlJsRVzNetxIPJMDoD6rcc2F9Zvk8oteCm+Cb5VHI4S+bUSq7FA98XrhvHL8u3R+5qqgt4U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ZifL0Bsf; arc=none smtp.client-ip=209.85.128.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZifL0Bsf" Received: by mail-wm1-f48.google.com with SMTP id 5b1f17b1804b1-47103b6058fso3294925e9.1 for ; Wed, 15 Oct 2025 03:35:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1760524548; x=1761129348; darn=vger.kernel.org; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:from:to:cc:subject :date:message-id:reply-to; bh=7QNXCpktIYAb1DPjGOe7dO+9+h/oG2Y1WU2nDERyLWo=; b=ZifL0BsfiFIMHz/ld2J9irwBtjZlex3rBImlrXEtgVACHZK1as8pZARWpbGup2LRcD i4d9iTXIuH+GtiJhJ/rFfzttMHa5+WUYTCBOMU+5eoIE+NcnGhc24FtQz2WbZ8LbrkZc CL6gJIKGcgUevB+D1wKpUESM4qfDvT2yTA6MtZblelCLB657hgGtDPH7RkCbvnductmp hBSeUBYblMWbpZJagvD/38jmCF7JoCB2I523YLYF0VZfeUvMRYvT1K03Jwbd9fsaYXUK /bhGEfcbRpel98FB9LNOfJLH8lMRyadhTT24XnycfIA3AL9Xyy/OLf2LzCtFdUcc1w53 tuHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760524548; x=1761129348; h=mime-version:user-agent:content-transfer-encoding:references :in-reply-to:date:cc:to:from:subject:message-id:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=7QNXCpktIYAb1DPjGOe7dO+9+h/oG2Y1WU2nDERyLWo=; b=gjJaezB/KGsojJQbKT/8pBOW+2Pt9AQDiuWNACGjK/fisxEQoX9aSjWYiIpRG3chJG ts5HI2Kcpurn2M15NPKCwZy2sOSjSCNOEzrtFgkKgj2r4TMudeQA5rz7jyqgQweLPTCU Wv0gGvPYwOz3Gr55Yq9UcxBRzzFZpUfbZIkwOsUF8DoeEVauQd8b+pqEtrMvCowneXGw dPzQSQesN6exJbHdRqOCoQK0k2zSkJ1OHvzVKfVhFaFG4Otv30AxPk4MAqxINtPM4dem UwWZ34CaEROickPjM3hbv2vWAbJrlHi066u0UCVOQJqmdwLN59ZawgQMvggr0qLvp/U7 fQmQ== X-Forwarded-Encrypted: i=1; AJvYcCWVg4mhRfRNt+JWyfUtg6zcsickba1KK9kUQtO3uMfr7AHXr+lnm07ovLxIu9GQba6pH7rhazI/jGs=@vger.kernel.org X-Gm-Message-State: AOJu0YxIr0/9H6EkFnX0OwZyNv/UEivK0B7v28YxeCizhE5n3gdNzhe8 almy7cw1aQgRxu3/5CqjZig5puOati669m4831jAp2B1KyRBv6pPXmRN X-Gm-Gg: ASbGncv9E+jLGI2j2XJUWhibRT7dZ1/lSk/zL3Yn/aKwt+VmgE6NVIKM/UZDDs5LLKU BtrIADzoV+Q90Ll/mxNgJyKVuslpfuxRAUezfwC1NxKsqwMfeOtQKqFyYSz0o6otEa90GY9kd5p S2ozBeozYIokWt7qByfCgL1GWeVIAbxfn3cV/rkj4Egi4B9mNl684QjRaT6OL0+BCTiL7/AmYKI jdSpycK3QMKIZ86o5OpLab8d46xesTVfoXoU/NK4zBKsg4ROrh3HiD/NUDxZTiUqieNcjVvUBDJ 4j6+1i8ZN4cQtiMocvQ+ycFfWt/Ey5Izbik5sHhgvHXRDki1hP3F0CE2zA1hTzwkp0SzQ+2Uon/ Gr+sv5gc4DdOW129nifZCdICS/4kqTeMIewRvj5gKl501mCn/bIzl/LPeZ3gS X-Google-Smtp-Source: AGHT+IERvd+DCsAGw5wufhvSoXWWpJyqmq8RwH0h8dyTRRhpT1w1j/81EeNMDn3zr7X5Guqk61mo0A== X-Received: by 2002:a05:600c:450e:b0:46e:1a60:c995 with SMTP id 5b1f17b1804b1-46fa9e8dcc7mr223056895e9.2.1760524548098; Wed, 15 Oct 2025 03:35:48 -0700 (PDT) Received: from [192.168.1.187] ([161.230.67.253]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47101c23a52sm19972125e9.12.2025.10.15.03.35.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Oct 2025 03:35:47 -0700 (PDT) Message-ID: Subject: Re: [PATCH 6/6] iio: adc: ad7380: Add support for multiple SPI buses From: Nuno =?ISO-8859-1?Q?S=E1?= To: David Lechner , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marcelo Schmitt , Michael Hennerich , Nuno =?ISO-8859-1?Q?S=E1?= , Jonathan Cameron , Andy Shevchenko Cc: Sean Anderson , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Date: Wed, 15 Oct 2025 11:36:20 +0100 In-Reply-To: <20251014-spi-add-multi-bus-support-v1-6-2098c12d6f5f@baylibre.com> References: <20251014-spi-add-multi-bus-support-v1-0-2098c12d6f5f@baylibre.com> <20251014-spi-add-multi-bus-support-v1-6-2098c12d6f5f@baylibre.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.0 Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-10-14 at 17:02 -0500, David Lechner wrote: > Add support for multiple SPI buses to increase throughput. The AD7380 > family of ADCs have multiple SDO lines on the chip that can be used to > read each channel on a separate SPI bus. If wired up to a SPI controller > that supports it, the driver will now take advantage of this feature. > This allows reaching the maximum sample rate advertised in the datasheet > when combined with SPI offloading. >=20 > Signed-off-by: David Lechner > --- One minor thing. With it, Reviewed-by: Nuno S=C3=A1 > =C2=A0drivers/iio/adc/ad7380.c | 41 ++++++++++++++++++++++++++++---------= ---- > =C2=A01 file changed, 28 insertions(+), 13 deletions(-) >=20 > diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c > index > bfd908deefc0f40b42bd8a44bfce7a2510b2fdf1..36abe95852006a81f7e31f8034699e5= 9292a > f79e 100644 > --- a/drivers/iio/adc/ad7380.c > +++ b/drivers/iio/adc/ad7380.c > @@ -77,8 +77,7 @@ > =C2=A0#define AD7380_CONFIG1_REFSEL BIT(1) > =C2=A0#define AD7380_CONFIG1_PMODE BIT(0) > =C2=A0 > -#define AD7380_CONFIG2_SDO2 GENMASK(9, 8) > -#define AD7380_CONFIG2_SDO BIT(8) > +#define AD7380_CONFIG2_SDO GENMASK(9, 8) > =C2=A0#define AD7380_CONFIG2_RESET GENMASK(7, 0) > =C2=A0 > =C2=A0#define AD7380_CONFIG2_RESET_SOFT 0x3C > @@ -92,11 +91,6 @@ > =C2=A0#define T_CONVERT_X_NS 500 /* xth conversion start time > (oversampling) */ > =C2=A0#define T_POWERUP_US 5000 /* Power up */ > =C2=A0 > -/* > - * AD738x support several SDO lines to increase throughput, but driver > currently > - * supports only 1 SDO line (standard SPI transaction) > - */ > -#define AD7380_NUM_SDO_LINES 1 > =C2=A0#define AD7380_DEFAULT_GAIN_MILLI 1000 > =C2=A0 > =C2=A0/* > @@ -1084,7 +1078,7 @@ static int ad7380_set_ch(struct ad7380_state *st, > unsigned int ch) > =C2=A0 if (oversampling_ratio > 1) > =C2=A0 xfer.delay.value =3D T_CONVERT_0_NS + > =C2=A0 T_CONVERT_X_NS * (oversampling_ratio - 1) * > - st->chip_info->num_simult_channels / > AD7380_NUM_SDO_LINES; > + st->chip_info->num_simult_channels / st->spi- > >num_data_bus; > =C2=A0 > =C2=A0 return spi_sync_transfer(st->spi, &xfer, 1); > =C2=A0} > @@ -1113,7 +1107,7 @@ static int ad7380_update_xfers(struct ad7380_state = *st, > =C2=A0 if (oversampling_ratio > 1) > =C2=A0 t_convert =3D T_CONVERT_0_NS + T_CONVERT_X_NS * > =C2=A0 (oversampling_ratio - 1) * > - st->chip_info->num_simult_channels / > AD7380_NUM_SDO_LINES; > + st->chip_info->num_simult_channels / st->spi- > >num_data_bus; > =C2=A0 > =C2=A0 if (st->seq) { > =C2=A0 xfer[0].delay.value =3D xfer[1].delay.value =3D t_convert; > @@ -1124,6 +1118,7 @@ static int ad7380_update_xfers(struct ad7380_state = *st, > =C2=A0 AD7380_SPI_BYTES(scan_type) * > =C2=A0 st->chip_info->num_simult_channels; > =C2=A0 xfer[3].rx_buf =3D xfer[2].rx_buf + xfer[2].len; > + xfer[3].multi_bus_mode =3D xfer[2].multi_bus_mode; Why not doing the above once during probe? - Nuno S=C3=A1