From: Mark Brown <broonie@kernel.org> To: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>, Tudor Ambarus <Tudor.Ambarus@microchip.com>, Michal Simek <michal.simek@xilinx.com>, linux-spi@vger.kernel.org, Mark Brown <broonie@kernel.org>, Thomas Petazzoni <thomas.petazzoni@bootlin.com>, linux-arm-kernel@lists.infradead.org Subject: Applied "spi: zynq-qspi: Clarify the select chip function" to the spi tree Date: Fri, 8 Nov 2019 17:45:43 +0000 (GMT) [thread overview] Message-ID: <20191108174543.7A0102741703@ypsilon.sirena.org.uk> (raw) In-Reply-To: <20191108140744.1734-6-miquel.raynal@bootlin.com> The patch spi: zynq-qspi: Clarify the select chip function has been applied to the spi tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-5.5 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From dffaf7439979e6dbb820633bb4f44dcadcac847e Mon Sep 17 00:00:00 2001 From: Miquel Raynal <miquel.raynal@bootlin.com> Date: Fri, 8 Nov 2019 15:07:42 +0100 Subject: [PATCH] spi: zynq-qspi: Clarify the select chip function The code used to assert and de-assert a chip select line is very complicated for no reason. Simplify the logic by either setting or resetting the concerned bit, which actually only changes an electrical state. Update the comment to reflect that there is no possibility to actually choose a CS as the default (CS0) will be driven in any case. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/r/20191108140744.1734-6-miquel.raynal@bootlin.com Signed-off-by: Mark Brown <broonie@kernel.org> --- drivers/spi/spi-zynq-qspi.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c index 70ecefd817f7..80e51c894eaa 100644 --- a/drivers/spi/spi-zynq-qspi.c +++ b/drivers/spi/spi-zynq-qspi.c @@ -50,7 +50,6 @@ #define ZYNQ_QSPI_CONFIG_BDRATE_MASK GENMASK(5, 3) /* Baud Rate Mask */ #define ZYNQ_QSPI_CONFIG_CPHA_MASK BIT(2) /* Clock Phase Control */ #define ZYNQ_QSPI_CONFIG_CPOL_MASK BIT(1) /* Clock Polarity Control */ -#define ZYNQ_QSPI_CONFIG_SSCTRL_MASK BIT(10) /* Slave Select Mask */ #define ZYNQ_QSPI_CONFIG_FWIDTH_MASK GENMASK(7, 6) /* FIFO width */ #define ZYNQ_QSPI_CONFIG_MSTREN_MASK BIT(0) /* Master Mode */ @@ -62,7 +61,7 @@ */ #define ZYNQ_QSPI_CONFIG_BAUD_DIV_MAX GENMASK(2, 0) /* Baud rate maximum */ #define ZYNQ_QSPI_CONFIG_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift */ -#define ZYNQ_QSPI_CONFIG_PCS 10 /* Peripheral Chip Select */ +#define ZYNQ_QSPI_CONFIG_PCS BIT(10) /* Peripheral Chip Select */ /* * QSPI Interrupt Registers bit Masks @@ -287,16 +286,12 @@ static void zynq_qspi_chipselect(struct spi_device *spi, bool assert) struct zynq_qspi *xqspi = spi_controller_get_devdata(ctlr); u32 config_reg; + /* Ground the line to assert the CS */ config_reg = zynq_qspi_read(xqspi, ZYNQ_QSPI_CONFIG_OFFSET); - if (assert) { - /* Select the slave */ - config_reg &= ~ZYNQ_QSPI_CONFIG_SSCTRL_MASK; - config_reg |= (((~(BIT(spi->chip_select))) << - ZYNQ_QSPI_CONFIG_PCS) & - ZYNQ_QSPI_CONFIG_SSCTRL_MASK); - } else { - config_reg |= ZYNQ_QSPI_CONFIG_SSCTRL_MASK; - } + if (assert) + config_reg &= ~ZYNQ_QSPI_CONFIG_PCS; + else + config_reg |= ZYNQ_QSPI_CONFIG_PCS; zynq_qspi_write(xqspi, ZYNQ_QSPI_CONFIG_OFFSET, config_reg); } -- 2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Mark Brown <broonie@kernel.org> To: Miquel Raynal <miquel.raynal@bootlin.com> Cc: Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>, Tudor Ambarus <Tudor.Ambarus@microchip.com>, Michal Simek <michal.simek@xilinx.com>, linux-spi@vger.kernel.org, Mark Brown <broonie@kernel.org>, Thomas Petazzoni <thomas.petazzoni@bootlin.com>, linux-arm-kernel@lists.infradead.org Subject: Applied "spi: zynq-qspi: Clarify the select chip function" to the spi tree Date: Fri, 8 Nov 2019 17:45:43 +0000 (GMT) [thread overview] Message-ID: <20191108174543.7A0102741703@ypsilon.sirena.org.uk> (raw) In-Reply-To: <20191108140744.1734-6-miquel.raynal@bootlin.com> The patch spi: zynq-qspi: Clarify the select chip function has been applied to the spi tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-5.5 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark From dffaf7439979e6dbb820633bb4f44dcadcac847e Mon Sep 17 00:00:00 2001 From: Miquel Raynal <miquel.raynal@bootlin.com> Date: Fri, 8 Nov 2019 15:07:42 +0100 Subject: [PATCH] spi: zynq-qspi: Clarify the select chip function The code used to assert and de-assert a chip select line is very complicated for no reason. Simplify the logic by either setting or resetting the concerned bit, which actually only changes an electrical state. Update the comment to reflect that there is no possibility to actually choose a CS as the default (CS0) will be driven in any case. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/r/20191108140744.1734-6-miquel.raynal@bootlin.com Signed-off-by: Mark Brown <broonie@kernel.org> --- drivers/spi/spi-zynq-qspi.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c index 70ecefd817f7..80e51c894eaa 100644 --- a/drivers/spi/spi-zynq-qspi.c +++ b/drivers/spi/spi-zynq-qspi.c @@ -50,7 +50,6 @@ #define ZYNQ_QSPI_CONFIG_BDRATE_MASK GENMASK(5, 3) /* Baud Rate Mask */ #define ZYNQ_QSPI_CONFIG_CPHA_MASK BIT(2) /* Clock Phase Control */ #define ZYNQ_QSPI_CONFIG_CPOL_MASK BIT(1) /* Clock Polarity Control */ -#define ZYNQ_QSPI_CONFIG_SSCTRL_MASK BIT(10) /* Slave Select Mask */ #define ZYNQ_QSPI_CONFIG_FWIDTH_MASK GENMASK(7, 6) /* FIFO width */ #define ZYNQ_QSPI_CONFIG_MSTREN_MASK BIT(0) /* Master Mode */ @@ -62,7 +61,7 @@ */ #define ZYNQ_QSPI_CONFIG_BAUD_DIV_MAX GENMASK(2, 0) /* Baud rate maximum */ #define ZYNQ_QSPI_CONFIG_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift */ -#define ZYNQ_QSPI_CONFIG_PCS 10 /* Peripheral Chip Select */ +#define ZYNQ_QSPI_CONFIG_PCS BIT(10) /* Peripheral Chip Select */ /* * QSPI Interrupt Registers bit Masks @@ -287,16 +286,12 @@ static void zynq_qspi_chipselect(struct spi_device *spi, bool assert) struct zynq_qspi *xqspi = spi_controller_get_devdata(ctlr); u32 config_reg; + /* Ground the line to assert the CS */ config_reg = zynq_qspi_read(xqspi, ZYNQ_QSPI_CONFIG_OFFSET); - if (assert) { - /* Select the slave */ - config_reg &= ~ZYNQ_QSPI_CONFIG_SSCTRL_MASK; - config_reg |= (((~(BIT(spi->chip_select))) << - ZYNQ_QSPI_CONFIG_PCS) & - ZYNQ_QSPI_CONFIG_SSCTRL_MASK); - } else { - config_reg |= ZYNQ_QSPI_CONFIG_SSCTRL_MASK; - } + if (assert) + config_reg &= ~ZYNQ_QSPI_CONFIG_PCS; + else + config_reg |= ZYNQ_QSPI_CONFIG_PCS; zynq_qspi_write(xqspi, ZYNQ_QSPI_CONFIG_OFFSET, config_reg); } -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-11-08 17:45 UTC|newest] Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-08 14:07 [PATCH v2 0/7] spi: zynq-qspi: Clarify and fix the chip selection Miquel Raynal 2019-11-08 14:07 ` [PATCH v2 1/7] spi: zynq-qspi: Anything else than CS0 is not supported yet Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 17:45 ` Applied "spi: zynq-qspi: Anything else than CS0 is not supported yet" to the spi tree Mark Brown 2019-11-08 17:45 ` Mark Brown 2019-11-08 14:07 ` [PATCH v2 2/7] spi: zynq-qspi: Keep the naming consistent across the driver Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 14:07 ` [PATCH v2 3/7] spi: zynq-qspi: Keep the bitfields naming consistent Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 17:45 ` Applied "spi: zynq-qspi: Keep the bitfields naming consistent" to the spi tree Mark Brown 2019-11-08 17:45 ` Mark Brown 2019-11-08 14:07 ` [PATCH v2 4/7] spi: zynq-qspi: Enhance the Linear CFG bit definitions Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 17:45 ` Applied "spi: zynq-qspi: Enhance the Linear CFG bit definitions" to the spi tree Mark Brown 2019-11-08 17:45 ` Mark Brown 2019-11-08 14:07 ` [PATCH v2 5/7] spi: zynq-qspi: Clarify the select chip function Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 17:45 ` Mark Brown [this message] 2019-11-08 17:45 ` Applied "spi: zynq-qspi: Clarify the select chip function" to the spi tree Mark Brown 2019-11-08 14:07 ` [PATCH v2 6/7] spi: zynq-qspi: Do the actual hardware initialization later in the probe Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 17:45 ` Applied "spi: zynq-qspi: Do the actual hardware initialization later in the probe" to the spi tree Mark Brown 2019-11-08 17:45 ` Mark Brown 2019-11-08 14:07 ` [PATCH v2 7/7] spi: zynq-qspi: Support two chip selects Miquel Raynal 2019-11-08 14:07 ` Miquel Raynal 2019-11-08 17:45 ` Applied "spi: zynq-qspi: Support two chip selects" to the spi tree Mark Brown 2019-11-08 17:45 ` Mark Brown
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