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Re: [Linux-gpib-general] gpib_bitbang: problem with GPIO tables
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From: dave p. <dpe...@gm...> - 2024-08-28 13:38:17
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Hi,
The tables come from the different RPi device trees. Earlier Pi3A+, Pi3B+
based on bcm2837 had the same DT as Pi2B based on bcm2836 but with gpio14
and 15 called TXD1 and RXD1 instead of TXD0 and RXD0 as for the Pi2B. The
bcm2710 and bcm2711 are all like table index 2. As we have no clean way to
test what system we are running on we try the three different tables from
the oldest to newest.
cheers,
-Dave
On Mon, 26 Aug 2024 at 14:20, Michael Schwingen <mi...@sc...>
wrote:
> Hi,
>
> since the conversion of gpib_bitbang to gpiod lookup tables for GPIO
> allocation (which I think is a good idea, since it gets rid of the
> gpio_offset hack), I am having (slight) problems, since some GPIOs are not
> found on my Pi 3B.
>
> The previous version (2ab64102a655fe183cf9653ab20b0511e95159fb) would
> simply
> fail on my RP3B due to "SPI_MISO" not being found. Using the RP5 table on
> my RP3B fixed this.
>
> The current code does this on its own: allocating SPI_MISO fails, and the
> code tries further tables until the RP45 table works - however, this raises
> the question why there is a separate table for RP3 if it does not work on a
> RP3B?
>
>
> Raspberry Pi 3B, git c2c696d3cb6a3bb81974688a85cdf40a815a9f7c
>
> [ 0.000000] Linux version 6.6.31+rpt-rpi-v7 (se...@ra...)
> (gcc-12 (Raspbian 12.2.0-14+rpi1) 12.2.0, GNU ld (GNU Binutils for
> Raspbian) 2.40) #1 SMP Raspbian 1:6.6.31-1+rpt1 (2024-05-29)
> [ 0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7),
> cr=10c5383d
>
> [11692.014745] Linux-GPIB 4.3.6 Driver
> [11692.032150] gpib: registered gpib_bitbang interface
> [11692.032174] gpib_bitbang:bb_init_module - module loaded with pin map
> "yoga"
> [11693.087510] gpib_bitbang:bb_attach - Using pin map "yoga"
> [11693.087545] gpib_bitbang:allocate_gpios - Allocating gpios using table
> index 0
> [11693.087562] gpib_bitbang:allocate_gpios - Allocating gpio GPIO20 pin no
> 20
> [11693.087607] gpib_bitbang:allocate_gpios - Allocating gpio GPIO26 pin no
> 26
> [11693.087633] gpib_bitbang:allocate_gpios - Allocating gpio GPIO13 pin no
> 13
> [11693.087658] gpib_bitbang:allocate_gpios - Allocating gpio GPIO12 pin no
> 12
> [11693.087681] gpib_bitbang:allocate_gpios - Allocating gpio GPIO21 pin no
> 21
> [11693.087705] gpib_bitbang:allocate_gpios - Allocating gpio GPIO19 pin no
> 19
> [11693.087729] gpib_bitbang:allocate_gpios - Allocating gpio GPIO6 pin no 6
> [11693.087751] gpib_bitbang:allocate_gpios - Allocating gpio GPIO5 pin no 5
> [11693.087773] gpib_bitbang:allocate_gpios - Allocating gpio GPIO9 pin no 9
> [11693.087796] gpib_common gpib0: cannot find GPIO line SPI_MISO, deferring
> [11693.087811] gpib_bitbang:allocate_gpios - Allocation failed, now
> using table_index 1
> [11693.087823] gpib_bitbang:allocate_gpios - Allocating gpio GPIO9 pin no 9
> [11693.087840] gpib_common gpib0: cannot find GPIO line SPI_MISO, deferring
> [11693.087853] gpib_bitbang:allocate_gpios - Allocation failed, now
> using table_index 2
> [11693.087864] gpib_bitbang:allocate_gpios - Allocating gpio GPIO9 pin no 9
> [11693.087887] gpib_bitbang:allocate_gpios - Allocating gpio GPIO24 pin no
> 24
> [11693.087911] gpib_bitbang:allocate_gpios - Allocating gpio GPIO22 pin no
> 22
> [11693.087935] gpib_bitbang:allocate_gpios - Allocating gpio GPIO25 pin no
> 25
> [11693.087959] gpib_bitbang:allocate_gpios - Allocating gpio GPIO27 pin no
> 27
> [11693.087983] gpib_bitbang:allocate_gpios - Allocating gpio GPIO10 pin no
> 10
> [11693.088005] gpib_bitbang:allocate_gpios - Allocating gpio GPIO23 pin no
> 23
> [11693.088029] gpib_bitbang:allocate_gpios - Allocating gpio GPIO11 pin no
> 11
> [11693.088052] gpib_bitbang:allocate_gpios - Allocating gpio GPIO18 pin no
> 18
> [11693.088172] gpib_bitbang:bb_attach - attached board 0
>
> gpioinfo shows:
>
> gpiochip0 - 54 lines:
> line 0: "ID_SDA" unused input active-high
> line 1: "ID_SCL" unused input active-high
> line 2: "GPIO2" unused input active-high
> line 3: "GPIO3" unused input active-high
> line 4: "GPIO4" "hat_led" output active-high [used]
> line 5: "GPIO5" "GPIO5" output active-high [used]
> line 6: "GPIO6" "GPIO6" output active-high [used]
> line 7: "GPIO7" unused input active-high
> line 8: "GPIO8" unused input active-high
> line 9: "GPIO9" "GPIO9" output active-high [used]
> line 10: "GPIO10" "GPIO10" output active-high [used]
> line 11: "GPIO11" "GPIO11" input active-high [used]
> line 12: "GPIO12" "GPIO12" output active-high [used]
> line 13: "GPIO13" "GPIO13" output active-high [used]
> line 14: "GPIO14" unused input active-high
> line 15: "GPIO15" unused input active-high
> line 16: "GPIO16" unused input active-high
> line 17: "GPIO17" unused input active-high
> line 18: "GPIO18" "GPIO18" output active-high [used]
> line 19: "GPIO19" "GPIO19" output active-high [used]
> line 20: "GPIO20" "GPIO20" output active-high [used]
> line 21: "GPIO21" "GPIO21" output active-high [used]
> line 22: "GPIO22" "GPIO22" output active-high [used]
> line 23: "GPIO23" "GPIO23" input active-high [used]
> line 24: "GPIO24" "GPIO24" input active-high [used]
> line 25: "GPIO25" "GPIO25" input active-high [used]
> line 26: "GPIO26" "GPIO26" output active-high [used]
> line 27: "GPIO27" "GPIO27" output active-high [used]
> line 28: "HDMI_HPD_N" "hpd" input active-low [used]
> line 29: "STATUS_LED_G" "ACT" output active-high [used]
> line 30: "CTS0" unused input active-high
> line 31: "RTS0" unused input active-high
> line 32: "TXD0" unused input active-high
> line 33: "RXD0" unused input active-high
> line 34: "SD1_CLK" unused input active-high
> line 35: "SD1_CMD" unused input active-high
> line 36: "SD1_DATA0" unused input active-high
> line 37: "SD1_DATA1" unused input active-high
> line 38: "SD1_DATA2" unused input active-high
> line 39: "SD1_DATA3" unused input active-high
> line 40: "PWM0_OUT" unused input active-high
> line 41: "PWM1_OUT" unused input active-high
> line 42: "ETH_CLK" unused input active-high
> line 43: "WIFI_CLK" unused input active-high
> line 44: "SDA0" unused input active-high
> line 45: "SCL0" unused input active-high
> line 46: "SMPS_SCL" unused input active-high
> line 47: "SMPS_SDA" unused output active-high
> line 48: "SD_CLK_R" unused input active-high
> line 49: "SD_CMD_R" unused input active-high
> line 50: "SD_DATA0_R" unused input active-high
> line 51: "SD_DATA1_R" unused input active-high
> line 52: "SD_DATA2_R" unused input active-high
> line 53: "SD_DATA3_R" unused input active-high
> gpiochip1 - 8 lines:
> line 0: "BT_ON" unused output active-high
> line 1: "WL_ON" unused output active-high
> line 2: "PWR_LED_R" "PWR" output active-low [used]
> line 3: "LAN_RUN" unused output active-high
> line 4: "NC" unused input active-high
> line 5: "CAM_GPIO0" "cam1_regulator" output active-high [used]
> line 6: "CAM_GPIO1" unused output active-high
> line 7: "NC" unused input active-high
>
>
> Where do these gpio_gpib_* tables come from? It looks to me like we should
> be able to use generic names ("GPIO9" instead of "SPI_MISO") for all
> machines (ie. simply use the rp45 table), since they are in the device
> tree
> - but I am no expert on this. Are these different depending on OS version?
>
> Looking at the device tree files shows generic names (eg. GPIO9 instead of
> SPI_MISO):
>
> dtc -I dtb -O dts /boot/firmware/bcm2711-rpi-4-b.dtb | grep
> gpio-line-names
> gpio-line-names =
> "ID_SDA\0ID_SCL\0GPIO2\0GPIO3\0GPIO4\0GPIO5\0GPIO6\0GPIO7\0GPIO8\0GPIO9\0GPIO10\0GPIO11\0GPIO12\0GPIO13\0GPIO14\0GPIO15\0GPIO16\0GPIO17\0GPIO18\0GPIO19\0GPIO20\0GPIO21\0GPIO22\0GPIO23\0GPIO24\0GPIO25\0GPIO26\0GPIO27\0RGMII_MDIO\0RGMIO_MDC\0CTS0\0RTS0\0TXD0\0RXD0\0SD1_CLK\0SD1_CMD\0SD1_DATA0\0SD1_DATA1\0SD1_DATA2\0SD1_DATA3\0PWM0_MISO\0PWM1_MOSI\0STATUS_LED_G_CLK\0SPIFLASH_CE_N\0SDA0\0SCL0\0RGMII_RXCLK\0RGMII_RXCTL\0RGMII_RXD0\0RGMII_RXD1\0RGMII_RXD2\0RGMII_RXD3\0RGMII_TXCLK\0RGMII_TXCTL\0RGMII_TXD0\0RGMII_TXD1\0RGMII_TXD2\0RGMII_TXD3";
>
> dtc -I dtb -O dts /boot/firmware/bcm2710-rpi-3-b.dtb | grep
> gpio-line-names
> gpio-line-names =
> "ID_SDA\0ID_SCL\0GPIO2\0GPIO3\0GPIO4\0GPIO5\0GPIO6\0GPIO7\0GPIO8\0GPIO9\0GPIO10\0GPIO11\0GPIO12\0GPIO13\0GPIO14\0GPIO15\0GPIO16\0GPIO17\0GPIO18\0GPIO19\0GPIO20\0GPIO21\0GPIO22\0GPIO23\0GPIO24\0GPIO25\0GPIO26\0GPIO27\0NC\0LAN_RUN_BOOT\0CTS0\0RTS0\0TXD0\0RXD0\0SD1_CLK\0SD1_CMD\0SD1_DATA0\0SD1_DATA1\0SD1_DATA2\0SD1_DATA3\0PWM0_OUT\0PWM1_OUT\0ETH_CLK\0WIFI_CLK\0SDA0\0SCL0\0SMPS_SCL\0SMPS_SDA\0SD_CLK_R\0SD_CMD_R\0SD_DATA0_R\0SD_DATA1_R\0SD_DATA2_R\0SD_DATA3_R";
>
> dtc -I dtb -O dts /boot/firmware/bcm2710-rpi-2-b.dtb | grep
> gpio-line-names
> gpio-line-names =
> "ID_SDA\0ID_SCL\0GPIO2\0GPIO3\0GPIO4\0GPIO5\0GPIO6\0GPIO7\0GPIO8\0GPIO9\0GPIO10\0GPIO11\0GPIO12\0GPIO13\0GPIO14\0GPIO15\0GPIO16\0GPIO17\0GPIO18\0GPIO19\0GPIO20\0GPIO21\0GPIO22\0GPIO23\0GPIO24\0GPIO25\0GPIO26\0GPIO27\0SDA0\0SCL0\0NC\0LAN_RUN\0CAM_GPIO1\0NC\0NC\0PWR_LOW_N\0NC\0NC\0USB_LIMIT\0NC\0PWM0_OUT\0CAM_GPIO0\0SMPS_SCL\0SMPS_SDA\0ETH_CLK\0PWM1_OUT\0HDMI_HPD_N\0STATUS_LED\0SD_CLK_R\0SD_CMD_R\0SD_DATA0_R\0SD_DATA1_R\0SD_DATA2_R\0SD_DATA3_R";
>
> cu
> Michael
>
>
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