| Message ID | 20171211050704.20621-3-joel@jms.id.au (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Dec 11, 2017 at 6:06 AM, Joel Stanley <joel@jms.id.au> wrote: > These are used to by the device tree to map pin numbers to constants > required by the GPIO bindings. > + > +#define ASPEED_GPIO_PORT_A 0 > +#define ASPEED_GPIO_PORT_B 1 > +#define ASPEED_GPIO_PORT_C 2 > +#define ASPEED_GPIO_PORT_D 3 > +#define ASPEED_GPIO_PORT_E 4 > +#define ASPEED_GPIO_PORT_F 5 > +#define ASPEED_GPIO_PORT_G 6 > +#define ASPEED_GPIO_PORT_H 7 > +#define ASPEED_GPIO_PORT_I 8 > +#define ASPEED_GPIO_PORT_J 9 > +#define ASPEED_GPIO_PORT_K 10 > +#define ASPEED_GPIO_PORT_L 11 > +#define ASPEED_GPIO_PORT_M 12 > +#define ASPEED_GPIO_PORT_N 13 > +#define ASPEED_GPIO_PORT_O 14 > +#define ASPEED_GPIO_PORT_P 15 > +#define ASPEED_GPIO_PORT_Q 16 > +#define ASPEED_GPIO_PORT_R 17 > +#define ASPEED_GPIO_PORT_S 18 > +#define ASPEED_GPIO_PORT_T 19 > +#define ASPEED_GPIO_PORT_U 20 > +#define ASPEED_GPIO_PORT_V 21 > +#define ASPEED_GPIO_PORT_W 22 > +#define ASPEED_GPIO_PORT_X 23 > +#define ASPEED_GPIO_PORT_Y 24 > +#define ASPEED_GPIO_PORT_Z 25 > +#define ASPEED_GPIO_PORT_AA 26 > +#define ASPEED_GPIO_PORT_AB 27 > +#define ASPEED_GPIO_PORT_AC 28 This looks like a 1:1 mapping, wouldn't it be easier to just describe it in the binding document? Arnd
On Mon, Dec 11, 2017 at 6:26 PM, Arnd Bergmann <arnd@arndb.de> wrote: > On Mon, Dec 11, 2017 at 6:06 AM, Joel Stanley <joel@jms.id.au> wrote: >> These are used to by the device tree to map pin numbers to constants >> required by the GPIO bindings. >> + >> +#define ASPEED_GPIO_PORT_A 0 >> +#define ASPEED_GPIO_PORT_B 1 >> +#define ASPEED_GPIO_PORT_C 2 >> +#define ASPEED_GPIO_PORT_D 3 >> +#define ASPEED_GPIO_PORT_E 4 >> +#define ASPEED_GPIO_PORT_F 5 >> +#define ASPEED_GPIO_PORT_G 6 >> +#define ASPEED_GPIO_PORT_H 7 >> +#define ASPEED_GPIO_PORT_I 8 >> +#define ASPEED_GPIO_PORT_J 9 >> +#define ASPEED_GPIO_PORT_K 10 >> +#define ASPEED_GPIO_PORT_L 11 >> +#define ASPEED_GPIO_PORT_M 12 >> +#define ASPEED_GPIO_PORT_N 13 >> +#define ASPEED_GPIO_PORT_O 14 >> +#define ASPEED_GPIO_PORT_P 15 >> +#define ASPEED_GPIO_PORT_Q 16 >> +#define ASPEED_GPIO_PORT_R 17 >> +#define ASPEED_GPIO_PORT_S 18 >> +#define ASPEED_GPIO_PORT_T 19 >> +#define ASPEED_GPIO_PORT_U 20 >> +#define ASPEED_GPIO_PORT_V 21 >> +#define ASPEED_GPIO_PORT_W 22 >> +#define ASPEED_GPIO_PORT_X 23 >> +#define ASPEED_GPIO_PORT_Y 24 >> +#define ASPEED_GPIO_PORT_Z 25 >> +#define ASPEED_GPIO_PORT_AA 26 >> +#define ASPEED_GPIO_PORT_AB 27 >> +#define ASPEED_GPIO_PORT_AC 28 > > This looks like a 1:1 mapping, wouldn't it be easier to just describe > it in the binding document? You're right, it is a linear mapping. We use it so references to GPIO numbers are human readable in the device tree: #define ASPEED_GPIO(port, offset) \ ((ASPEED_GPIO_PORT_##port * 8) + offset) can be used: identify { gpios = <&gpio ASPEED_GPIO(A, 2) GPIO_ACTIVE_LOW>; }; We find that has cut down on mistakes in calculating offsets into GPIO banks. Cheers, Joel
diff --git a/arch/arm/boot/dts/aspeed-g4.dtsi b/arch/arm/boot/dts/aspeed-g4.dtsi index 45d815a86d42..100d092e6c07 100644 --- a/arch/arm/boot/dts/aspeed-g4.dtsi +++ b/arch/arm/boot/dts/aspeed-g4.dtsi @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include "skeleton.dtsi" +#include <dt-bindings/gpio/aspeed-gpio.h> / { model = "Aspeed BMC"; diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi index 5c4ecdba3a6b..1f9d28313f82 100644 --- a/arch/arm/boot/dts/aspeed-g5.dtsi +++ b/arch/arm/boot/dts/aspeed-g5.dtsi @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include "skeleton.dtsi" +#include <dt-bindings/gpio/aspeed-gpio.h> / { model = "Aspeed BMC"; diff --git a/include/dt-bindings/gpio/aspeed-gpio.h b/include/dt-bindings/gpio/aspeed-gpio.h new file mode 100644 index 000000000000..56fc4889b2c4 --- /dev/null +++ b/include/dt-bindings/gpio/aspeed-gpio.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * This header provides constants for binding aspeed,*-gpio. + * + * The first cell in Aspeed's GPIO specifier is the GPIO ID. The macros below + * provide names for this. + * + * The second cell contains standard flag values specified in gpio.h. + */ + +#ifndef _DT_BINDINGS_GPIO_ASPEED_GPIO_H +#define _DT_BINDINGS_GPIO_ASPEED_GPIO_H + +#include <dt-bindings/gpio/gpio.h> + +#define ASPEED_GPIO_PORT_A 0 +#define ASPEED_GPIO_PORT_B 1 +#define ASPEED_GPIO_PORT_C 2 +#define ASPEED_GPIO_PORT_D 3 +#define ASPEED_GPIO_PORT_E 4 +#define ASPEED_GPIO_PORT_F 5 +#define ASPEED_GPIO_PORT_G 6 +#define ASPEED_GPIO_PORT_H 7 +#define ASPEED_GPIO_PORT_I 8 +#define ASPEED_GPIO_PORT_J 9 +#define ASPEED_GPIO_PORT_K 10 +#define ASPEED_GPIO_PORT_L 11 +#define ASPEED_GPIO_PORT_M 12 +#define ASPEED_GPIO_PORT_N 13 +#define ASPEED_GPIO_PORT_O 14 +#define ASPEED_GPIO_PORT_P 15 +#define ASPEED_GPIO_PORT_Q 16 +#define ASPEED_GPIO_PORT_R 17 +#define ASPEED_GPIO_PORT_S 18 +#define ASPEED_GPIO_PORT_T 19 +#define ASPEED_GPIO_PORT_U 20 +#define ASPEED_GPIO_PORT_V 21 +#define ASPEED_GPIO_PORT_W 22 +#define ASPEED_GPIO_PORT_X 23 +#define ASPEED_GPIO_PORT_Y 24 +#define ASPEED_GPIO_PORT_Z 25 +#define ASPEED_GPIO_PORT_AA 26 +#define ASPEED_GPIO_PORT_AB 27 +#define ASPEED_GPIO_PORT_AC 28 + +#define ASPEED_GPIO(port, offset) \ + ((ASPEED_GPIO_PORT_##port * 8) + offset) + +#endif
These are used to by the device tree to map pin numbers to constants required by the GPIO bindings. Signed-off-by: Joel Stanley <joel@jms.id.au> --- arch/arm/boot/dts/aspeed-g4.dtsi | 1 + arch/arm/boot/dts/aspeed-g5.dtsi | 1 + include/dt-bindings/gpio/aspeed-gpio.h | 49 ++++++++++++++++++++++++++++++++++ 3 files changed, 51 insertions(+) create mode 100644 include/dt-bindings/gpio/aspeed-gpio.h