| Message ID | 1319544088-25946-2-git-send-email-swarren@nvidia.com |
|---|---|
| State | Accepted, archived |
| Headers | show |
On Tue, Oct 25, 2011 at 02:01:27PM +0200, Stephen Warren wrote: > *_pinmux_init() register the GPIO and pinmux devices so that they're ready > before any other device needs them. > > *_pinmux_init() are also called by board-dt.c in order to set up the GPIO > and pinmux configurations. In this case, if we register the devices, they > end up being probed once due to this registration, and a second time due > to a device-tree node (or vice-versa). The second probe fails since the > memory regions are already requested. Besides, we don't actually want the > duplicated devices. > > To avoid this duplicate registration, modify *_pinmux_init() to check > whether it's running on a DT machine. If not, register the pinmux devices. > If so, don't register them. > > Finally, modify board-dt.c to call the *_pinmux_init() after all devices have > been instantiated from device-tree. This allows the GPIO and pinmux devices > to be instantiated and initialized before calling functions to configure the > hardware. > > This has one disadvantage: The pinmux and GPIO initialization now happens > after /all/ devices are instantiated, rather than after just gpio and > pinmux but before anything else. So the correct HW configuration is not > in place when e.g. the SD/MMC device is probed. Long-term, this should be > solved by doing both: > > a) Initializing the HW state from DT nodes during GPIO and pinmux device > probe. > b) Using the deferred driver probe mechanism, so that drivers can defer > their probe until after the gpio and pinmux drivers have probed. > > v2: s/int is_dt/bool is_dt/ > v3: Use of_machine_is_compatible inside *_pinmux_init() rather than passing > an explicit parameter into the function from outside. > > Signed-off-by: Stephen Warren <swarren@nvidia.com> > --- > arch/arm/mach-tegra/board-dt.c | 13 +++++++------ > arch/arm/mach-tegra/board-harmony-pinmux.c | 6 +++++- > arch/arm/mach-tegra/board-paz00-pinmux.c | 6 +++++- > arch/arm/mach-tegra/board-seaboard-pinmux.c | 5 ++++- > arch/arm/mach-tegra/board-trimslice-pinmux.c | 5 ++++- > 5 files changed, 25 insertions(+), 10 deletions(-) This looks pretty good. Given the fact that current behavior is buggy, merging it for 3.2 makes sense. Grant, you OK with that for the prerequisite OF patch? -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm/mach-tegra/board-dt.c b/arch/arm/mach-tegra/board-dt.c index d368f8d..74743ad 100644 --- a/arch/arm/mach-tegra/board-dt.c +++ b/arch/arm/mach-tegra/board-dt.c @@ -101,6 +101,13 @@ static void __init tegra_dt_init(void) tegra_clk_init_from_table(tegra_dt_clk_init_table); + /* + * Finished with the static registrations now; fill in the missing + * devices + */ + of_platform_populate(NULL, tegra_dt_match_table, + tegra20_auxdata_lookup, NULL); + for (i = 0; i < ARRAY_SIZE(pinmux_configs); i++) { if (of_machine_is_compatible(pinmux_configs[i].machine)) { pinmux_configs[i].init(); @@ -110,12 +117,6 @@ static void __init tegra_dt_init(void) WARN(i == ARRAY_SIZE(pinmux_configs), "Unknown platform! Pinmuxing not initialized\n"); - - /* - * Finished with the static registrations now; fill in the missing - * devices - */ - of_platform_populate(NULL, tegra_dt_match_table, tegra20_auxdata_lookup, NULL); } static const char * tegra_dt_board_compat[] = { diff --git a/arch/arm/mach-tegra/board-harmony-pinmux.c b/arch/arm/mach-tegra/board-harmony-pinmux.c index e99b456..7a4a26d 100644 --- a/arch/arm/mach-tegra/board-harmony-pinmux.c +++ b/arch/arm/mach-tegra/board-harmony-pinmux.c @@ -16,6 +16,8 @@ #include <linux/kernel.h> #include <linux/gpio.h> +#include <linux/of.h> + #include <mach/pinmux.h> #include "gpio-names.h" @@ -161,7 +163,9 @@ static struct tegra_gpio_table gpio_table[] = { void harmony_pinmux_init(void) { - platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices)); + if (!of_machine_is_compatible("nvidia,tegra20")) + platform_add_devices(pinmux_devices, + ARRAY_SIZE(pinmux_devices)); tegra_pinmux_config_table(harmony_pinmux, ARRAY_SIZE(harmony_pinmux)); diff --git a/arch/arm/mach-tegra/board-paz00-pinmux.c b/arch/arm/mach-tegra/board-paz00-pinmux.c index fb20894..be30e21 100644 --- a/arch/arm/mach-tegra/board-paz00-pinmux.c +++ b/arch/arm/mach-tegra/board-paz00-pinmux.c @@ -16,6 +16,8 @@ #include <linux/kernel.h> #include <linux/gpio.h> +#include <linux/of.h> + #include <mach/pinmux.h> #include "gpio-names.h" @@ -158,7 +160,9 @@ static struct tegra_gpio_table gpio_table[] = { void paz00_pinmux_init(void) { - platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices)); + if (!of_machine_is_compatible("nvidia,tegra20")) + platform_add_devices(pinmux_devices, + ARRAY_SIZE(pinmux_devices)); tegra_pinmux_config_table(paz00_pinmux, ARRAY_SIZE(paz00_pinmux)); diff --git a/arch/arm/mach-tegra/board-seaboard-pinmux.c b/arch/arm/mach-tegra/board-seaboard-pinmux.c index fbce31d..eb5991d 100644 --- a/arch/arm/mach-tegra/board-seaboard-pinmux.c +++ b/arch/arm/mach-tegra/board-seaboard-pinmux.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/gpio.h> +#include <linux/of.h> #include <mach/pinmux.h> #include <mach/pinmux-t2.h> @@ -218,7 +219,9 @@ static void __init update_pinmux(struct tegra_pingroup_config *newtbl, int size) void __init seaboard_common_pinmux_init(void) { - platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices)); + if (!of_machine_is_compatible("nvidia,tegra20")) + platform_add_devices(pinmux_devices, + ARRAY_SIZE(pinmux_devices)); tegra_pinmux_config_table(seaboard_pinmux, ARRAY_SIZE(seaboard_pinmux)); diff --git a/arch/arm/mach-tegra/board-trimslice-pinmux.c b/arch/arm/mach-tegra/board-trimslice-pinmux.c index 4969dd2..7ab719d 100644 --- a/arch/arm/mach-tegra/board-trimslice-pinmux.c +++ b/arch/arm/mach-tegra/board-trimslice-pinmux.c @@ -16,6 +16,7 @@ #include <linux/gpio.h> #include <linux/kernel.h> #include <linux/init.h> +#include <linux/of.h> #include <mach/pinmux.h> @@ -157,7 +158,9 @@ static struct tegra_gpio_table gpio_table[] = { void __init trimslice_pinmux_init(void) { - platform_add_devices(pinmux_devices, ARRAY_SIZE(pinmux_devices)); + if (!of_machine_is_compatible("nvidia,tegra20")) + platform_add_devices(pinmux_devices, + ARRAY_SIZE(pinmux_devices)); tegra_pinmux_config_table(trimslice_pinmux, ARRAY_SIZE(trimslice_pinmux)); tegra_gpio_config(gpio_table, ARRAY_SIZE(gpio_table)); }
*_pinmux_init() register the GPIO and pinmux devices so that they're ready before any other device needs them. *_pinmux_init() are also called by board-dt.c in order to set up the GPIO and pinmux configurations. In this case, if we register the devices, they end up being probed once due to this registration, and a second time due to a device-tree node (or vice-versa). The second probe fails since the memory regions are already requested. Besides, we don't actually want the duplicated devices. To avoid this duplicate registration, modify *_pinmux_init() to check whether it's running on a DT machine. If not, register the pinmux devices. If so, don't register them. Finally, modify board-dt.c to call the *_pinmux_init() after all devices have been instantiated from device-tree. This allows the GPIO and pinmux devices to be instantiated and initialized before calling functions to configure the hardware. This has one disadvantage: The pinmux and GPIO initialization now happens after /all/ devices are instantiated, rather than after just gpio and pinmux but before anything else. So the correct HW configuration is not in place when e.g. the SD/MMC device is probed. Long-term, this should be solved by doing both: a) Initializing the HW state from DT nodes during GPIO and pinmux device probe. b) Using the deferred driver probe mechanism, so that drivers can defer their probe until after the gpio and pinmux drivers have probed. v2: s/int is_dt/bool is_dt/ v3: Use of_machine_is_compatible inside *_pinmux_init() rather than passing an explicit parameter into the function from outside. Signed-off-by: Stephen Warren <swarren@nvidia.com> --- arch/arm/mach-tegra/board-dt.c | 13 +++++++------ arch/arm/mach-tegra/board-harmony-pinmux.c | 6 +++++- arch/arm/mach-tegra/board-paz00-pinmux.c | 6 +++++- arch/arm/mach-tegra/board-seaboard-pinmux.c | 5 ++++- arch/arm/mach-tegra/board-trimslice-pinmux.c | 5 ++++- 5 files changed, 25 insertions(+), 10 deletions(-)