From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.zlab.su (mail.zlab.su [109.73.193.145]) (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 44F9C3B27E3; Sun, 23 Aug 2026 12:36:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=109.73.193.145 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787488606; cv=none; b=LeGiX9t+Vup9/DLSOMtmcb/SSmZARJExfnNwLgNp+E91FGcvdxlv+3HcR5Kop+O4FX2ma/LESsf7z38Y4+bMdVDyfnHqi8EmeYLf7Vwl1AOR2a6+Mhi7eQ9UsccPvT0vswdEhFzXV3HT740i+F6A4dGUZVene3VtpN6+YqHpRno= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787488606; c=relaxed/simple; bh=nGm5Xuxn5GpFz+y6WM5ZYEyHp3PUioUEI0sqYUwy75w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U71XJw6PQ0dtV4ejifViMIAybgUboatl5g9o7mEwqa3N+ZoWny6+JIS4GX1bfwpG3UPw4XkEny4KIIs420b6iAE06lC/9QGHuZuEPlzjymbpkBi4QddcJrOOBLlm7MBzbNaWdaW3rrrMwIWqhhVEGdPI5gwPpT+wkYFXGfniddo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=zlab.su; spf=pass smtp.mailfrom=zlab.su; dkim=pass (2048-bit key) header.d=zlab.su header.i=@zlab.su header.b=Bj62Z5LJ; arc=none smtp.client-ip=109.73.193.145 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=zlab.su Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zlab.su Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=zlab.su header.i=@zlab.su header.b="Bj62Z5LJ" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id CA884BFB0E; Sun, 23 Aug 2026 15:21:23 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zlab.su; s=dkim; t=1787487698; h=from:subject:date:message-id:to:cc:mime-version: content-transfer-encoding:in-reply-to:references; bh=Ak38qDD4gXhLwI3K5lsvDYopaUPFcUHfgh4biboOh5s=; b=Bj62Z5LJRCVVNmcn8bayhs7BANpOy8wygEPOVHBmivDJBmayy7z76Hnq+Jy1W4dQKXYVyM OdxBPcDEaZV6WIIQCEpsNCEteMpVaWAVcN7o5xX4Fo4sWPwlPT7sHP0KvV8ji5KKHC4cWk nyioYmqn6N5MzpHR0mEuMGxIoGZP1XMkKxhsbiteiypkwWCrkvGjwv9qQM8qWnPJELEouE 1LYlHaIvhZV4/4W4OQ00sevBTWYw/McYS2neXgxZ+dzj5W0z/lX1jwaX6kdXY9/97ocGQE rDMhLkECq8GDMGUmRPZF/BjaYEiw8xLU1bFRHTdSR9G2HFFFR+6YK7x2/RuCqg== From: Vladislav Leonov To: Jonathan Cameron Cc: Vladislav Leonov , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Heiko Stuebner , Simon Glass , linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] iio: adc: rockchip_saradc: Add support for RV1106 Date: Sun, 23 Aug 2026 15:20:32 +0300 Message-ID: <20260823122039.20831-2-vlad@zlab.su> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260823122039.20831-1-vlad@zlab.su> References: <20260823122039.20831-1-vlad@zlab.su> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 The Successive Approximation ADC (SARADC) in RV1106 uses the v2 controller and supports: - 10-bit resolution - Up to 1MS/s sampling rate - 2 single-ended input channels "dt-bindings: iio: adc: rockchip-saradc: Add RV1106 compatible" documents "rockchip,rv1106-saradc" as falling back to "rockchip,rk3588-saradc" (see Link below). The two IP blocks are not equivalent, though: per the RV1106 TRM v0.3, chapter 20 (SAR-ADC), RV1106 only has 2 channels at 10-bit resolution, versus 8 channels at 12-bit on RK3588. Without a dedicated match entry, the driver binds via the fallback compatible and uses the RK3588 channel table, which reports 8 channels instead of 2, and an in_voltage_scale that is off by exactly 4x (4096 vs 1024 full-scale). Add a dedicated compatible/data pair for RV1106 with the correct 2-channel, 10-bit layout. Tested on a custom RV1106-based board, with: &saradc { vref-supply = <&vcc_saradc>; /* 1.8V fixed regulator */ status = "okay"; }; Before this patch: # ls /sys/bus/iio/devices/iio:device0/in_voltage*_raw | wc -l 8 # cat /sys/bus/iio/devices/iio:device0/in_voltage_scale 0.439453125 After this patch: # ls /sys/bus/iio/devices/iio:device0/in_voltage*_raw | wc -l 2 # cat /sys/bus/iio/devices/iio:device0/in_voltage_scale 1.757812500 Link: https://lore.kernel.org/all/20260714131631.v2.1.0b846080833e4b836793c43fc26d1c6d817cf9b4@changeid/ Signed-off-by: Vladislav Leonov --- No changes in v2. v1 https://lore.kernel.org/all/20260810090826.146758-1-vlad@zlab.su drivers/iio/adc/rockchip_saradc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index 0f0bf2906af0..5c45fae11890 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -348,6 +348,19 @@ static const struct rockchip_saradc_data rk3588_saradc_data = { .read = rockchip_saradc_read_v2, }; +static const struct iio_chan_spec rockchip_rv1106_saradc_iio_channels[] = { + SARADC_CHANNEL(0, "adc0", 10), + SARADC_CHANNEL(1, "adc1", 10), +}; + +static const struct rockchip_saradc_data rv1106_saradc_data = { + .channels = rockchip_rv1106_saradc_iio_channels, + .num_channels = ARRAY_SIZE(rockchip_rv1106_saradc_iio_channels), + .clk_rate = 1000000, + .start = rockchip_saradc_start_v2, + .read = rockchip_saradc_read_v2, +}; + static const struct of_device_id rockchip_saradc_match[] = { { .compatible = "rockchip,saradc", @@ -370,6 +383,9 @@ static const struct of_device_id rockchip_saradc_match[] = { }, { .compatible = "rockchip,rk3588-saradc", .data = &rk3588_saradc_data, + }, { + .compatible = "rockchip,rv1106-saradc", + .data = &rv1106_saradc_data, }, { } }; -- 2.47.3