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From:   Francesco Dolcini <francesco@dolcini.it>
To:     Nishanth Menon <nm@ti.com>, Vignesh Raghavendra <vigneshr@ti.com>,
        Tero Kristo <kristo@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>
Cc:     Joao Paulo Goncalves <joao.goncalves@toradex.com>,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Francesco Dolcini <francesco.dolcini@toradex.com>
Subject: [PATCH v2 1/3] arm64: dts: ti: verdin-am62: improve spi1 chip-select pinctrl
Date:   Fri,  1 Dec 2023 15:55:49 +0100
Message-Id: <20231201145551.23337-2-francesco@dolcini.it>
In-Reply-To: <20231201145551.23337-1-francesco@dolcini.it>
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From: Joao Paulo Goncalves <joao.goncalves@toradex.com>

Verdin SPI_1 interface has a dedicated hardware controlled chip select
that is currently configured in the same pinctrl group as MISO/MOSI/CLK,
however it is possible that it can be used only as a standard GPIO be it
a chip select or not.

To maximize flexibility and avoid duplication in the carrier board dts
files move the SPI_1 CS in a dedicated pinctrl and also adds an
additional pinctrl to simplify using SPI_1 CS as a GPIO.

Signed-off-by: Joao Paulo Goncalves <joao.goncalves@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
---
 arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
index 5db52f237253..6a06724b6d16 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
@@ -233,6 +233,13 @@ AM62X_IOPAD(0x0018, PIN_INPUT, 7) /* (F24) OSPI0_D3.GPIO0_6 */ /* SODIMM 62 */
 		>;
 	};
 
+	/* Verdin SPI_1 CS as GPIO */
+	pinctrl_qspi1_io4_gpio: main-gpio0-7-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x001c, PIN_INPUT, 7) /* (J23) OSPI0_D4.GPIO0_7 */ /* SODIMM 202 */
+		>;
+	};
+
 	/* Verdin QSPI_1_CS# as GPIO (conflict with Verdin QSPI_1 interface) */
 	pinctrl_qspi1_cs_gpio: main-gpio0-11-default-pins {
 		pinctrl-single,pins = <
@@ -599,12 +606,18 @@ AM62X_IOPAD(0x164, PIN_OUTPUT, 0) /* (AA19) RGMII2_TX_CTL */ /* SODIMM 211 */
 	pinctrl_spi1: main-spi1-default-pins {
 		pinctrl-single,pins = <
 			AM62X_IOPAD(0x0020, PIN_INPUT, 1) /* (J25) OSPI0_D5.SPI1_CLK */ /* SODIMM 196 */
-			AM62X_IOPAD(0x001c, PIN_INPUT, 1) /* (J23) OSPI0_D4.SPI1_CS0 */ /* SODIMM 202 */
 			AM62X_IOPAD(0x0024, PIN_INPUT, 1) /* (H25) OSPI0_D6.SPI1_D0  */ /* SODIMM 200 */
 			AM62X_IOPAD(0x0028, PIN_INPUT, 1) /* (J22) OSPI0_D7.SPI1_D1  */ /* SODIMM 198 */
 		>;
 	};
 
+	/* Verdin SPI_1 CS */
+	pinctrl_spi1_cs0: main-spi1-cs0-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x001c, PIN_INPUT, 1) /* (J23) OSPI0_D4.SPI1_CS0 */ /* SODIMM 202 */
+		>;
+	};
+
 	/* ETH_25MHz_CLK */
 	pinctrl_eth_clock: main-system-clkout0-default-pins {
 		pinctrl-single,pins = <
@@ -1278,7 +1291,7 @@ &main_mcan0 {
 /* Verdin SPI_1 */
 &main_spi1 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_spi1>;
+	pinctrl-0 = <&pinctrl_spi1>, <&pinctrl_spi1_cs0>;
 	ti,pindir-d0-out-d1-in;
 	status = "disabled";
 };
-- 
2.25.1