[PATCH 1/5] ARM: bcm2835: Define standard pinctrl groups in the gpio node.

* [PATCH 1/5] ARM: bcm2835: Define standard pinctrl groups in the gpio node.
       [not found] <1456425661-26123-1-git-send-email-eric@anholt.net>
@ 2016-02-25 18:40 ` Eric Anholt
  2016-02-25 22:24   ` Eric Anholt
  2016-02-25 18:41 ` [PATCH 4/5] ARM: bcm2835: Add a group for mapping pins 48-53 to sdhost Eric Anholt
  2016-02-25 18:41 ` [PATCH 5/5] ARM: bcm2835: Move most RPi default pin groups to their devices Eric Anholt
  2 siblings, 1 reply; 9+ messages in thread
From: Eric Anholt @ 2016-02-25 18:40 UTC (permalink / raw)
  To: linux-rpi-kernel
  Cc: linux-arm-kernel, linux-kernel, Stephen Warren, Lee Jones,
	Florian Fainelli, Rob Herring, Pawel Moll, Mark Rutland,
	Ian Campbell, Kumar Gala, devicetree, Linus Walleij, linux-gpio,
	Stefan Wahren, Eric Anholt

The BCM2835-ARM-Peripherals.pdf documentation specifies what the
function selects do for the pins, and there are a bunch of obvious
groupings to be made.  With these created, we'll be able to replace
bcm2835-rpi.dtsi's main "set all of these pins to alt0" with
references to specific groups we want enabled.

Signed-off-by: Eric Anholt <eric@anholt.net>
---
 arch/arm/boot/dts/bcm283x.dtsi | 170 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 170 insertions(+)

diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
index 8aaf193..e91198e 100644
--- a/arch/arm/boot/dts/bcm283x.dtsi
+++ b/arch/arm/boot/dts/bcm283x.dtsi
@@ -110,6 +110,176 @@
 
 			interrupt-controller;
 			#interrupt-cells = <2>;
+
+			/* Defines pin muxing groups according to
+			 * BCM2835-ARM-Peripherals.pdf page 102.
+			 *
+			 * While each pin can have its mux selected
+			 * for various functions individually, some
+			 * groups only make sense to switch to a
+			 * particular function together.
+			 */
+			i2c0_gpio0: i2c0_gpio0 {
+				brcm,pins = <0 1>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			i2c1_gpio2: i2c1_gpio2 {
+				brcm,pins = <2 3>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			gpclk0_gpio4: gpclk0_gpio4 {
+				brcm,pins = <4>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			gpclk1_gpio5: gpclk1_gpio5 {
+				brcm,pins = <5>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			gpclk2_gpio6: gpclk2_gpio6 {
+				brcm,pins = <6>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			spi0_gpio7: spi0_gpio7 {
+				brcm,pins = <7 8 9 10 11>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			pwm0_gpio12: pwm0_gpio12 {
+				brcm,pins = <12>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			pwm1_gpio13: pwm1_gpio13 {
+				brcm,pins = <13>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			uart0_gpio14: uart0_gpio14 {
+				brcm,pins = <14 15>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			pcm_gpio18: pcm_gpio18 {
+				brcm,pins = <18 19 20 21>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			i2c0_gpio32: i2c0_gpio32 {
+				brcm,pins = <32 34>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			spio0_gpio35: spio0_gpio35 {
+				brcm,pins = <35 36 37 38 39>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			pwm0_gpio40: pwm0_gpio40 {
+				brcm,pins = <40>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			pwm1_gpio41: pwm1_gpio41 {
+				brcm,pins = <41>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			gpclk1_gpio42: gpclk1_gpio42 {
+				brcm,pins = <42>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			gpclk2_gpio43: gpclk2_gpio43 {
+				brcm,pins = <43>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			gpclk1_gpio44: gpclk1_gpio44 {
+				brcm,pins = <44>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			pwm1_gpio45: pwm1_gpio45 {
+				brcm,pins = <45>;
+				brcm,function = <BCM2835_FSEL_ALT0>;
+			};
+			i2c0_gpio44: i2c0_gpio44 {
+				brcm,pins = <44 45>;
+				brcm,function = <BCM2835_FSEL_ALT1>;
+			};
+			pcm_gpio28: pcm_gpio28 {
+				brcm,pins = <28 29 30 31>;
+				brcm,function = <BCM2835_FSEL_ALT2>;
+			};
+			uart1_gpio36: uart1_gpio36 {
+				brcm,pins = <36 37 38 39>;
+				brcm,function = <BCM2835_FSEL_ALT2>;
+			};
+			i2c1_gpio44: i2c1_gpio44 {
+				brcm,pins = <44 45>;
+				brcm,function = <BCM2835_FSEL_ALT2>;
+			};
+			/* Separate from the uart0_gpio14 group
+			 * because it conflicts with spi1_gpio16, and
+			 * people often run uart0 on the two pins
+			 * without flow contrl.
+			 */
+			uart0_ctsrts_gpio16: uart0_ctsrts_gpio16 {
+				brcm,pins = <16 17>;
+				brcm,function = <BCM2835_FSEL_ALT3>;
+			};
+			i2c_slave_gpio18: i2c_slave_gpio18 {
+				brcm,pins = <18 19 20 21>;
+				brcm,function = <BCM2835_FSEL_ALT3>;
+			};
+			emmc_gpio22: emmc_gpio22 {
+				brcm,pins = <22 23 24 25 26 27>;
+				brcm,function = <BCM2835_FSEL_ALT3>;
+			};
+			uart0_gpio30: uart0_gpio30 {
+				brcm,pins = <30 31>;
+				brcm,function = <BCM2835_FSEL_ALT3>;
+			};
+			uart0_ctsrts_gpio32: uart0_ctsrts_gpio32 {
+				brcm,pins = <32 33>;
+				brcm,function = <BCM2835_FSEL_ALT3>;
+			};
+			spi1_gpio16: spi1_gpio16 {
+				brcm,pins = <16 17 18 19 20 21>;
+				brcm,function = <BCM2835_FSEL_ALT4>;
+			};
+			jtag_gpio22: jtag_gpio22 {
+				brcm,pins = <22 23 24 25 26 27>;
+				brcm,function = <BCM2835_FSEL_ALT4>;
+			};
+			spi2_gpio40: spi2_gpio40 {
+				brcm,pins = <40 41 42 43 44 45>;
+				brcm,function = <BCM2835_FSEL_ALT4>;
+			};
+			jtag_gpio4: jtag_gpio4 {
+				brcm,pins = <4 5 6 12 13>;
+				brcm,function = <BCM2835_FSEL_ALT4>;
+			};
+			uart1_gpio14: uart1_gpio14 {
+				brcm,pins = <14 15>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			uart1_ctsrts_gpio16: uart1_ctsrts_gpio16 {
+				brcm,pins = <16 17>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			pwm0_gpio18: pwm0_gpio18 {
+				brcm,pins = <18>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			pwm1_gpio19: pwm1_gpio19 {
+				brcm,pins = <19>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			uart1_gpio32: uart1_gpio32 {
+				brcm,pins = <32 33>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			uart1_ctsrts_gpio30: uart1_ctsrts_gpio30 {
+				brcm,pins = <30 31>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			uart1_gpio40: uart1_gpio40 {
+				brcm,pins = <40 41>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
+			uart1_ctsrts_gpio42: uart1_ctsrts_gpio42 {
+				brcm,pins = <42 43>;
+				brcm,function = <BCM2835_FSEL_ALT5>;
+			};
 		};
 
 		uart0: serial@7e201000 {
-- 
2.7.0


^ permalink raw reply related	[flat|nested] 9+ messages in thread