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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-2569930f7f5sm3695527fac.44.2024.06.19.06.56.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Jun 2024 06:56:55 -0700 (PDT) Message-ID: <6f945701-cac0-4a56-9ca7-1daceccc5efd@baylibre.com> Date: Wed, 19 Jun 2024 08:56:54 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 4/6] spi: spi-axi-spi-engine: Add support for MOSI idle configuration To: Marcelo Schmitt , broonie@kernel.org, lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, nuno.sa@analog.com, marcelo.schmitt1@gmail.com Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org References: Content-Language: en-US From: David Lechner In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/18/24 6:11 PM, Marcelo Schmitt wrote: > Implement MOSI idle low and MOSI idle high to better support peripherals > that request specific MOSI behavior. > > Signed-off-by: Marcelo Schmitt > --- > drivers/spi/spi-axi-spi-engine.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c > index 0aa31d745734..787e22ae80c0 100644 > --- a/drivers/spi/spi-axi-spi-engine.c > +++ b/drivers/spi/spi-axi-spi-engine.c > @@ -41,6 +41,7 @@ > #define SPI_ENGINE_CONFIG_CPHA BIT(0) > #define SPI_ENGINE_CONFIG_CPOL BIT(1) > #define SPI_ENGINE_CONFIG_3WIRE BIT(2) > +#define SPI_ENGINE_CONFIG_SDO_IDLE BIT(3) Calling this SPI_ENGINE_CONFIG_SDO_IDLE_HIGH would make it more clear what happens when the bit is enabled. > > #define SPI_ENGINE_INST_TRANSFER 0x0 > #define SPI_ENGINE_INST_ASSERT 0x1 > @@ -132,6 +133,10 @@ static unsigned int spi_engine_get_config(struct spi_device *spi) > config |= SPI_ENGINE_CONFIG_CPHA; > if (spi->mode & SPI_3WIRE) > config |= SPI_ENGINE_CONFIG_3WIRE; > + if (spi->mode & SPI_MOSI_IDLE_HIGH) > + config |= SPI_ENGINE_CONFIG_SDO_IDLE; > + if (spi->mode & SPI_MOSI_IDLE_LOW) > + config &= ~SPI_ENGINE_CONFIG_SDO_IDLE; > > return config; > } > @@ -646,6 +651,9 @@ static int spi_engine_probe(struct platform_device *pdev) > > host->dev.of_node = pdev->dev.of_node; > host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_3WIRE; > + if (ADI_AXI_PCORE_VER_MAJOR(version) >= 1 && Currently, the major version is required to be 1, so this check is not strictly needed. > + ADI_AXI_PCORE_VER_MINOR(version) >= 3) > + host->mode_bits |= SPI_MOSI_IDLE_LOW | SPI_MOSI_IDLE_HIGH; > host->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); > host->max_speed_hz = clk_get_rate(spi_engine->ref_clk) / 2; > host->transfer_one_message = spi_engine_transfer_one_message;