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[195.32.7.93]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493be81df2asm152552155e9.12.2026.07.01.07.17.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Jul 2026 07:17:26 -0700 (PDT) From: Angelo Dureghello X-Google-Original-From: Angelo Dureghello Subject: [PATCH v7 0/2] add mcf54415 DAC driver Date: Wed, 01 Jul 2026 16:17:22 +0200 Message-Id: <20260701-wip-stmark2-dac-v7-0-ff8fdcc8010a@baylibre.com> Precedence: bulk X-Mailing-List: linux-m68k@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/4XRy07DMBAF0F+pssbI48c4YcV/IBbjFzXQpnJCo Kry7zhh0UJdsRxp7rmW59QMIacwNA+bU5PDlIbU78tg7jaN29L+JbDky9wILpArydlnOrBh3FF +E8yTY4Yjj6rzvlOxKalDDjF9reLT8888fNjX4MaFWTa2aRj7fFwrJ7Hs3dYnwTgLkmKLrVOc4 NHS8T3ZHO5dv1u0NapB1qPReQqau6iBfkeXt03y3K65uiZkIbgWiiA6cPJWuxD1KKANnLzUhKb SDv+0QyFao5xEUh1wXyHUBSHhmlCFMAE1WSVA+xqhzwRC5QK6ENagbaVE9NpVCLwk2msCC6Fag +Ct7dD//Yt5nr8Bqq48OogCAAA= X-Change-ID: 20260430-wip-stmark2-dac-7060f49dd94f To: Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Geert Uytterhoeven , Maxime Coquelin , Alexandre Torgue Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Angelo Dureghello , Andy Shevchenko X-Mailer: b4 0.15.2 This patchset adds a minimalistic DAC driver for the NXP mcf54415/6/7/8 builtin DACs. Currently the driver enables the raw write only. Feature as dma, sync, or format are not supoprted for this version. Additional options suppoerted by the DAC module will be added to the driver later on, as needed. The same patchset prepares the m68k/coldfire architecture to support the driver. Below some basic tests done on stmark2 mcf54415-based board, voltage check on DAC0 and DAC1: ~ # cd /sys/bus/iio/devices/iio:device0/ /sys/bus/iio/devices/iio:device0 # ls name out_voltage_scale uevent out_voltage_raw subsystem /sys/bus/iio/devices/iio:device0 # cat name mcf54415 /sys/bus/iio/devices/iio:device0 # echo 4095 > out_voltage_raw /sys/bus/iio/devices/iio:device0 # echo 2048 > out_voltage_raw /sys/bus/iio/devices/iio:device0 # echo 4096 > out_voltage_raw sh: write error: Invalid argument /sys/bus/iio/devices/iio:device0 # cat out_voltage_raw 2048 /sys/bus/iio/devices/iio:device0 # Same behavior for /sys/bus/iio/devices/iio:device1. Generated a sine wave by shell script, sine shape is good. is actually in progress: Note: this patchset depends on mew mcf_read/mcf_write implementation that Link: https://lore.kernel.org/linux-m68k/209d0653-6386-4b64-9e15-e358f84453ab@app.fastmail.com/T/#t Link: https://lore.kernel.org/linux-m68k/20260506142644.3234270-2-gerg@kernel.org/ --- Changes in v7: - keeping changelog in each single patch, where any - Link to v6: https://patch.msgid.link/20260618-wip-stmark2-dac-v6-0-48761dbb96d7@baylibre.com Changes in v6: - Removed patches 1 to 8, already pushed in m68knommu for-next by Greg Ungerer - keeping changelog in each single patch, where any - Link to v5: https://patch.msgid.link/20260610-wip-stmark2-dac-v5-0-b76b83366d5c@baylibre.com Changes in v5: - keeping changelog in each single patch, where any - Link to v4: https://patch.msgid.link/20260531-wip-stmark2-dac-v4-0-7e65ab4215dd@baylibre.com Changes in v4: - keeping changelog in each single patch, where any - Link to v3: https://patch.msgid.link/20260522-wip-stmark2-dac-v3-0-16be0ad35a67@baylibre.com Changes in v3: - keeping changelog in each single patch, where any - Link to v2: https://patch.msgid.link/20260513-wip-stmark2-dac-v2-0-fcdae50cf51a@baylibre.com Changes in v2: - keeping changelog in each single patch, where any - Link to v1: https://patch.msgid.link/20260504-wip-stmark2-dac-v1-0-874c36a4910d@baylibre.com To: Jonathan Cameron To: David Lechner To: Nuno Sá To: Andy Shevchenko To: Geert Uytterhoeven To: Maxime Coquelin To: Alexandre Torgue Cc: linux-kernel@vger.kernel.org Cc: linux-iio@vger.kernel.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-stm32@st-md-mailman.stormreply.com Cc: linux-arm-kernel@lists.infradead.org --- Angelo Dureghello (2): iio: dac: add mcf54415 DAC m68k: defconfig: update stmark2 defconfig arch/m68k/configs/stmark2_defconfig | 2 + drivers/iio/dac/Kconfig | 11 +++ drivers/iio/dac/Makefile | 1 + drivers/iio/dac/mcf54415_dac.c | 180 ++++++++++++++++++++++++++++++++++++ 4 files changed, 194 insertions(+) --- base-commit: bc5a85a5441632f4bd7acd38620fdcbe4852a44f change-id: 20260430-wip-stmark2-dac-7060f49dd94f Best regards, -- Angelo Dureghello