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Ip=[66.35.236.227]; Helo=[sj-itexedge03.altera.priv.altera.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL2PR03MB484 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Thor Thayer Some SPI masters require slave selection before the transfer can begin [1]. The SPI framework currently selects the chip using either 1) the internal CS mechanism or 2) the GPIO CS, but not both. This patch adds a boolean variable to indicate both the GPIO CS and the internal chip select should be used. Tested On: Altera CycloneV development kit Compile tested for build errors on x86_64 (allyesconfigs) [1] DesignWare dw_apb_ssi Databook, Version 3.20a (page 39) Signed-off-by: Thor Thayer --- v2 Move changes to SPI framework based on maintainer comments Add a new SPI master boolean variable. --- drivers/spi/spi.c | 10 ++++++++-- include/linux/spi/spi.h | 1 + 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 5787b72..c042a8c 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -697,10 +697,14 @@ static void spi_set_cs(struct spi_device *spi, bool enable) if (spi->mode & SPI_CS_HIGH) enable = !enable; - if (gpio_is_valid(spi->cs_gpio)) + if (gpio_is_valid(spi->cs_gpio)) { gpio_set_value(spi->cs_gpio, !enable); - else if (spi->master->set_cs) + /* Some SPI masters need both GPIO CS & slave_select */ + if (spi->master->set_cs && spi->master->gpio_ss) + spi->master->set_cs(spi, !enable); + } else if (spi->master->set_cs) { spi->master->set_cs(spi, !enable); + } } #ifdef CONFIG_HAS_DMA @@ -1845,6 +1849,8 @@ static int of_spi_register_master(struct spi_master *master) for (i = 0; i < nb; i++) cs[i] = of_get_named_gpio(np, "cs-gpios", i); + master->gpio_ss = of_property_read_bool(np, "gpio-ss"); + return 0; } #else diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 4b743ac..0437995 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -551,6 +551,7 @@ struct spi_master { /* gpio chip select */ int *cs_gpios; + bool gpio_ss; /* statistics */ struct spi_statistics statistics;