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Ip=[66.35.236.236]; Helo=[sj-itexedge04.altera.priv.altera.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM2PR03MB496 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 the slave to be selected before a transaction can occur - even in the case of GPIO chip select. This patch adds a GPIO slave select parameter to indicate the slave needs to be selected in the GPIO CS case. Signed-off-by: Thor Thayer --- v2 Add to SPI framework - add bindings. --- Documentation/devicetree/bindings/spi/spi-bus.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index 4b1d6e7..3a006bc 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -24,6 +24,7 @@ support describing the chip select layout. Optional properties: - cs-gpios - gpios chip select. - num-cs - total number of chipselects. +- gpio-ss - use internal slave select with gpio chip select. If cs-gpios is used the number of chip selects will be increased automatically with max(cs-gpios > hw cs).