[PATCH 0/2] OMAP2+: UART: Fix usage of default mux pads

[PATCH 0/2] OMAP2+: UART: Fix usage of default mux pads

[Govindraj.R]

From: "Govindraj.R" <govindraj.raja@ti.com>

We populating default uart mux pins if no mux data is provided
by board files. But were not probing the availability of uart pins
in tx/rx mode i.e. mux mode0. If particular pin is used for any other
purpose then default pads were breaking those peripherals e.g. uart2
pin was used as gpio nreset pin ehci on beagle board.

So remove the default adding procedure and probe the pins before
using them as uart pins. Determine if uart pins are used in uart mux_mode0
then configure rx pin for wakeup capability.

Testing updates:
Boot tested on 3430SDP
Tested on beagle-xm with ehci module which needs uart pin muxed as gpio
line for nreset sequence.

RX pad wakeup after enabling off mode in cpu_idle path and suspend path
tested - 3430SDP & Beagle-XM

Govindraj.R (2):
  OMAP2+: UART: Fix incorrect population of default uart pads
  OMAP2+: UART: Add mechanism to probe uart pins and configure rx
    wakeup

 arch/arm/mach-omap2/mux.c    |    3 +-
 arch/arm/mach-omap2/mux.h    |   10 +++
 arch/arm/mach-omap2/serial.c |  164 +++++++++++++-----------------------------
 3 files changed, 61 insertions(+), 116 deletions(-)

-- 
1.7.9

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Govindraj.R]

From: "Govindraj.R" <govindraj.raja@ti.com>

The following commit:
(7496ba3  ARM: OMAP2+: UART: Add default mux for all uarts)
added default pads for all uarts. But not all boards tend to
use all uarts and most of unused uart pins are muxed for
other purpose. This commit breaks the modules which where trying
to use unused uart pins on their boards.

So remove the default pads adding.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Russ Dill <russ.dill@gmail.com>
Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
---
 arch/arm/mach-omap2/serial.c |  116 ------------------------------------------
 1 files changed, 0 insertions(+), 116 deletions(-)

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index c9503a7..1554233 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -120,124 +120,8 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
 #endif /* CONFIG_PM */
 
 #ifdef CONFIG_OMAP_MUX
-static struct omap_device_pad default_uart1_pads[] __initdata = {
-	{
-		.name	= "uart1_cts.uart1_cts",
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart1_rts.uart1_rts",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart1_tx.uart1_tx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart1_rx.uart1_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-};
-
-static struct omap_device_pad default_uart2_pads[] __initdata = {
-	{
-		.name	= "uart2_cts.uart2_cts",
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart2_rts.uart2_rts",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart2_tx.uart2_tx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart2_rx.uart2_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-};
-
-static struct omap_device_pad default_uart3_pads[] __initdata = {
-	{
-		.name	= "uart3_cts_rctx.uart3_cts_rctx",
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart3_rts_sd.uart3_rts_sd",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart3_tx_irtx.uart3_tx_irtx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart3_rx_irrx.uart3_rx_irrx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-	},
-};
-
-static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
-	{
-		.name   = "gpmc_wait2.uart4_tx",
-		.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "gpmc_wait3.uart4_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
-		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
-	},
-};
-
-static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
-	{
-		.name	= "uart4_tx.uart4_tx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart4_rx.uart4_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-	},
-};
-
 static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
 {
-	switch (bdata->id) {
-	case 0:
-		bdata->pads = default_uart1_pads;
-		bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
-		break;
-	case 1:
-		bdata->pads = default_uart2_pads;
-		bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
-		break;
-	case 2:
-		bdata->pads = default_uart3_pads;
-		bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
-		break;
-	case 3:
-		if (cpu_is_omap44xx()) {
-			bdata->pads = default_omap4_uart4_pads;
-			bdata->pads_cnt =
-				ARRAY_SIZE(default_omap4_uart4_pads);
-		} else if (cpu_is_omap3630()) {
-			bdata->pads = default_omap36xx_uart4_pads;
-			bdata->pads_cnt =
-				ARRAY_SIZE(default_omap36xx_uart4_pads);
-		}
-		break;
-	default:
-		break;
-	}
 }
 #else
 static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
-- 
1.7.9

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Russ Dill]

On Tue, Apr 10, 2012 at 6:40 AM, Govindraj.R <govindraj.raja@ti.com> wrote:
> From: "Govindraj.R" <govindraj.raja@ti.com>
>
> The following commit:
> (7496ba3 ?ARM: OMAP2+: UART: Add default mux for all uarts)
> added default pads for all uarts. But not all boards tend to
> use all uarts and most of unused uart pins are muxed for
> other purpose. This commit breaks the modules which where trying
> to use unused uart pins on their boards.
>
> So remove the default pads adding.
>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Kevin Hilman <khilman@ti.com>
> Cc: Russ Dill <russ.dill@gmail.com>
> Reported-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>

Signed-off-by: Russ.Dill at ti.com

> ---
> ?arch/arm/mach-omap2/serial.c | ?116 ------------------------------------------
> ?1 files changed, 0 insertions(+), 116 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index c9503a7..1554233 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -120,124 +120,8 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
> ?#endif /* CONFIG_PM */
>
> ?#ifdef CONFIG_OMAP_MUX
> -static struct omap_device_pad default_uart1_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_cts.uart1_cts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_rts.uart1_rts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_tx.uart1_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_rx.uart1_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_uart2_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_cts.uart2_cts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_rts.uart2_rts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_tx.uart2_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_rx.uart2_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_uart3_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_cts_rctx.uart3_cts_rctx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_rts_sd.uart3_rts_sd",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_tx_irtx.uart3_tx_irtx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_rx_irrx.uart3_rx_irrx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "gpmc_wait2.uart4_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "gpmc_wait3.uart4_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE2,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT | OMAP_MUX_MODE2,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart4_tx.uart4_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart4_rx.uart4_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> ?static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
> ?{
> - ? ? ? switch (bdata->id) {
> - ? ? ? case 0:
> - ? ? ? ? ? ? ? bdata->pads = default_uart1_pads;
> - ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
> - ? ? ? ? ? ? ? break;
> - ? ? ? case 1:
> - ? ? ? ? ? ? ? bdata->pads = default_uart2_pads;
> - ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
> - ? ? ? ? ? ? ? break;
> - ? ? ? case 2:
> - ? ? ? ? ? ? ? bdata->pads = default_uart3_pads;
> - ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
> - ? ? ? ? ? ? ? break;
> - ? ? ? case 3:
> - ? ? ? ? ? ? ? if (cpu_is_omap44xx()) {
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap4_uart4_pads;
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt =
> - ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ARRAY_SIZE(default_omap4_uart4_pads);
> - ? ? ? ? ? ? ? } else if (cpu_is_omap3630()) {
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap36xx_uart4_pads;
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt =
> - ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ARRAY_SIZE(default_omap36xx_uart4_pads);
> - ? ? ? ? ? ? ? }
> - ? ? ? ? ? ? ? break;
> - ? ? ? default:
> - ? ? ? ? ? ? ? break;
> - ? ? ? }
> ?}
> ?#else
> ?static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
> --
> 1.7.9
>

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Russ Dill]

On Tue, Apr 10, 2012 at 6:40 AM, Govindraj.R <govindraj.raja@ti.com> wrote:
> From: "Govindraj.R" <govindraj.raja@ti.com>
>
> The following commit:
> (7496ba3 ?ARM: OMAP2+: UART: Add default mux for all uarts)
> added default pads for all uarts. But not all boards tend to
> use all uarts and most of unused uart pins are muxed for
> other purpose. This commit breaks the modules which where trying
> to use unused uart pins on their boards.
>
> So remove the default pads adding.
>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Kevin Hilman <khilman@ti.com>
> Cc: Russ Dill <russ.dill@gmail.com>
> Reported-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>

Acked-by: Russ Dill <russ.dill@ti.com>

> ---
> ?arch/arm/mach-omap2/serial.c | ?116 ------------------------------------------
> ?1 files changed, 0 insertions(+), 116 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index c9503a7..1554233 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -120,124 +120,8 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
> ?#endif /* CONFIG_PM */
>
> ?#ifdef CONFIG_OMAP_MUX
> -static struct omap_device_pad default_uart1_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_cts.uart1_cts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_rts.uart1_rts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_tx.uart1_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart1_rx.uart1_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_uart2_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_cts.uart2_cts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_rts.uart2_rts",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_tx.uart2_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart2_rx.uart2_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_uart3_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_cts_rctx.uart3_cts_rctx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_rts_sd.uart3_rts_sd",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_tx_irtx.uart3_tx_irtx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart3_rx_irrx.uart3_rx_irrx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "gpmc_wait2.uart4_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "gpmc_wait3.uart4_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE2,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT | OMAP_MUX_MODE2,
> - ? ? ? },
> -};
> -
> -static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart4_tx.uart4_tx",
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> - ? ? ? {
> - ? ? ? ? ? ? ? .name ? = "uart4_rx.uart4_rx",
> - ? ? ? ? ? ? ? .flags ?= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> - ? ? ? ? ? ? ? .enable = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? ? ? ? ? .idle ? = OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> - ? ? ? },
> -};
> -
> ?static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
> ?{
> - ? ? ? switch (bdata->id) {
> - ? ? ? case 0:
> - ? ? ? ? ? ? ? bdata->pads = default_uart1_pads;
> - ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
> - ? ? ? ? ? ? ? break;
> - ? ? ? case 1:
> - ? ? ? ? ? ? ? bdata->pads = default_uart2_pads;
> - ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
> - ? ? ? ? ? ? ? break;
> - ? ? ? case 2:
> - ? ? ? ? ? ? ? bdata->pads = default_uart3_pads;
> - ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
> - ? ? ? ? ? ? ? break;
> - ? ? ? case 3:
> - ? ? ? ? ? ? ? if (cpu_is_omap44xx()) {
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap4_uart4_pads;
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt =
> - ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ARRAY_SIZE(default_omap4_uart4_pads);
> - ? ? ? ? ? ? ? } else if (cpu_is_omap3630()) {
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap36xx_uart4_pads;
> - ? ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt =
> - ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ARRAY_SIZE(default_omap36xx_uart4_pads);
> - ? ? ? ? ? ? ? }
> - ? ? ? ? ? ? ? break;
> - ? ? ? default:
> - ? ? ? ? ? ? ? break;
> - ? ? ? }
> ?}
> ?#else
> ?static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
> --
> 1.7.9
>

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Tony Lindgren]

* Russ Dill <russ.dill@gmail.com> [120413 16:17]:
> On Tue, Apr 10, 2012 at 6:40 AM, Govindraj.R <govindraj.raja@ti.com> wrote:
> > From: "Govindraj.R" <govindraj.raja@ti.com>
> >
> > The following commit:
> > (7496ba3 ?ARM: OMAP2+: UART: Add default mux for all uarts)
> > added default pads for all uarts. But not all boards tend to
> > use all uarts and most of unused uart pins are muxed for
> > other purpose. This commit breaks the modules which where trying
> > to use unused uart pins on their boards.
> >
> > So remove the default pads adding.
> >
> > Cc: Felipe Balbi <balbi@ti.com>
> > Cc: Kevin Hilman <khilman@ti.com>
> > Cc: Russ Dill <russ.dill@gmail.com>
> > Reported-by: Tony Lindgren <tony@atomide.com>
> > Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
> 
> Acked-by: Russ Dill <russ.dill@ti.com>

Applying this into fixes with the updated comments as below.

Tony


From: "Govindraj.R" <govindraj.raja@ti.com>
Date: Tue, 17 Apr 2012 10:35:47 -0700
Subject: [PATCH] ARM: OMAP2+: UART: Fix incorrect population of default uart pads

Commit (7496ba3  ARM: OMAP2+: UART: Add default mux for all uarts)
wrongly added muxing of default pads for all uarts. This causes
breakage on multiple boards using uart pins for alternate functions.

For example, on zoom3 random oopses can be seen with nfsroot as
the smsc911x ethernet FIFO timings on GPMC bus are controlled
by gpmc_wait2 and gpmc_wait3 pins. This means we can't mux these
pads to uart4 functionality as commit 7496ba3 was doing.

Not all boards tend to use all uarts and most of unused uart pins
are muxed for other purpose. This commit breaks the modules which
where trying to use unused uart pins on their boards.

So remove the default pad muxing. Note that this is not a complete
fix, as we now rely on bootloader set muxing for the uart wake-up
events. Further patching is needed to enable wake-up events for
uarts that are already muxed to uart mode.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Acked-by: Russ Dill <russ.dill@gmail.com>
Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
[tony at atomide.com: updated comments to describe oops on zoom3]
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 0cdd359..2e351f5 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -120,124 +120,8 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
 #endif /* CONFIG_PM */
 
 #ifdef CONFIG_OMAP_MUX
-static struct omap_device_pad default_uart1_pads[] __initdata = {
-	{
-		.name	= "uart1_cts.uart1_cts",
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart1_rts.uart1_rts",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart1_tx.uart1_tx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart1_rx.uart1_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-};
-
-static struct omap_device_pad default_uart2_pads[] __initdata = {
-	{
-		.name	= "uart2_cts.uart2_cts",
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart2_rts.uart2_rts",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart2_tx.uart2_tx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart2_rx.uart2_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-};
-
-static struct omap_device_pad default_uart3_pads[] __initdata = {
-	{
-		.name	= "uart3_cts_rctx.uart3_cts_rctx",
-		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart3_rts_sd.uart3_rts_sd",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart3_tx_irtx.uart3_tx_irtx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart3_rx_irrx.uart3_rx_irrx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-	},
-};
-
-static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
-	{
-		.name   = "gpmc_wait2.uart4_tx",
-		.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "gpmc_wait3.uart4_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
-		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
-	},
-};
-
-static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
-	{
-		.name	= "uart4_tx.uart4_tx",
-		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
-	},
-	{
-		.name	= "uart4_rx.uart4_rx",
-		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
-		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
-	},
-};
-
 static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
 {
-	switch (bdata->id) {
-	case 0:
-		bdata->pads = default_uart1_pads;
-		bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
-		break;
-	case 1:
-		bdata->pads = default_uart2_pads;
-		bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
-		break;
-	case 2:
-		bdata->pads = default_uart3_pads;
-		bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
-		break;
-	case 3:
-		if (cpu_is_omap44xx()) {
-			bdata->pads = default_omap4_uart4_pads;
-			bdata->pads_cnt =
-				ARRAY_SIZE(default_omap4_uart4_pads);
-		} else if (cpu_is_omap3630()) {
-			bdata->pads = default_omap36xx_uart4_pads;
-			bdata->pads_cnt =
-				ARRAY_SIZE(default_omap36xx_uart4_pads);
-		}
-		break;
-	default:
-		break;
-	}
 }
 #else
 static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Kevin Hilman]

"Govindraj.R" <govindraj.raja@ti.com> writes:

> From: "Govindraj.R" <govindraj.raja@ti.com>
>
> The following commit:
> (7496ba3  ARM: OMAP2+: UART: Add default mux for all uarts)
> added default pads for all uarts. But not all boards tend to
> use all uarts and most of unused uart pins are muxed for
> other purpose. This commit breaks the modules which where trying
> to use unused uart pins on their boards.
>
> So remove the default pads adding.

I just noticed that this patch breaks runtime PM & wakeups for UART
console (at least on 3530/Overo with ttyO2 console.)

By removing the pads, the initial device_init_wakeup() is not called on
port init.  Without this call serial_omap_pm() disables runtime PM
because it checks device_may_wakeup().

Since runtime PM was disabled, I manually re-enabled it and then enabled
wakeups: 

  echo auto > /sys/devices/platform/omap_uart.2/power/control
  echo enabled > /sys/devices/platform/omap_uart.2/tty/ttyO2/power/wakeup

Then, after enabling auto-suspend timeouts, it seems wakeups are still
not working since the console hangs.

Reverting $SUBJECT patch gets things working again.

Kevin


> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Kevin Hilman <khilman@ti.com>
> Cc: Russ Dill <russ.dill@gmail.com>
> Reported-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
> ---
>  arch/arm/mach-omap2/serial.c |  116 ------------------------------------------
>  1 files changed, 0 insertions(+), 116 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index c9503a7..1554233 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -120,124 +120,8 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
>  #endif /* CONFIG_PM */
>  
>  #ifdef CONFIG_OMAP_MUX
> -static struct omap_device_pad default_uart1_pads[] __initdata = {
> -	{
> -		.name	= "uart1_cts.uart1_cts",
> -		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart1_rts.uart1_rts",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart1_tx.uart1_tx",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart1_rx.uart1_rx",
> -		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> -		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -	},
> -};
> -
> -static struct omap_device_pad default_uart2_pads[] __initdata = {
> -	{
> -		.name	= "uart2_cts.uart2_cts",
> -		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart2_rts.uart2_rts",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart2_tx.uart2_tx",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart2_rx.uart2_rx",
> -		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> -		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -	},
> -};
> -
> -static struct omap_device_pad default_uart3_pads[] __initdata = {
> -	{
> -		.name	= "uart3_cts_rctx.uart3_cts_rctx",
> -		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart3_rts_sd.uart3_rts_sd",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart3_tx_irtx.uart3_tx_irtx",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart3_rx_irrx.uart3_rx_irrx",
> -		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> -		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> -		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> -	},
> -};
> -
> -static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
> -	{
> -		.name   = "gpmc_wait2.uart4_tx",
> -		.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "gpmc_wait3.uart4_rx",
> -		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> -		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
> -		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
> -	},
> -};
> -
> -static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
> -	{
> -		.name	= "uart4_tx.uart4_tx",
> -		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
> -	},
> -	{
> -		.name	= "uart4_rx.uart4_rx",
> -		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
> -		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> -		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
> -	},
> -};
> -
>  static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
>  {
> -	switch (bdata->id) {
> -	case 0:
> -		bdata->pads = default_uart1_pads;
> -		bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
> -		break;
> -	case 1:
> -		bdata->pads = default_uart2_pads;
> -		bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
> -		break;
> -	case 2:
> -		bdata->pads = default_uart3_pads;
> -		bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
> -		break;
> -	case 3:
> -		if (cpu_is_omap44xx()) {
> -			bdata->pads = default_omap4_uart4_pads;
> -			bdata->pads_cnt =
> -				ARRAY_SIZE(default_omap4_uart4_pads);
> -		} else if (cpu_is_omap3630()) {
> -			bdata->pads = default_omap36xx_uart4_pads;
> -			bdata->pads_cnt =
> -				ARRAY_SIZE(default_omap36xx_uart4_pads);
> -		}
> -		break;
> -	default:
> -		break;
> -	}
>  }
>  #else
>  static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Raja, Govindraj]

On Tue, Apr 24, 2012 at 5:15 AM, Kevin Hilman <khilman@ti.com> wrote:
> "Govindraj.R" <govindraj.raja@ti.com> writes:
>
>> From: "Govindraj.R" <govindraj.raja@ti.com>
>>
>> The following commit:
>> (7496ba3 ?ARM: OMAP2+: UART: Add default mux for all uarts)
>> added default pads for all uarts. But not all boards tend to
>> use all uarts and most of unused uart pins are muxed for
>> other purpose. This commit breaks the modules which where trying
>> to use unused uart pins on their boards.
>>
>> So remove the default pads adding.
>
> I just noticed that this patch breaks runtime PM & wakeups for UART
> console (at least on 3530/Overo with ttyO2 console.)
>
> By removing the pads, the initial device_init_wakeup() is not called on
> port init. ?Without this call serial_omap_pm() disables runtime PM
> because it checks device_may_wakeup().
>
> Since runtime PM was disabled, I manually re-enabled it and then enabled
> wakeups:
>
> ?echo auto > /sys/devices/platform/omap_uart.2/power/control
> ?echo enabled > /sys/devices/platform/omap_uart.2/tty/ttyO2/power/wakeup
>
> Then, after enabling auto-suspend timeouts, it seems wakeups are still
> not working since the console hangs.
>
> Reverting $SUBJECT patch gets things working again.

This was decided as part of discussion [1]

If we are _reconsidering_ taking this patch [2]
to dynamically probe uart pins and enable rx wakeup.

I can re-work on the patch[2] as per tony's comments[1]
and re-post it.

--
Thanks,
Govindraj.R

[1]:
http://www.spinics.net/lists/linux-omap/msg68226.html

[2]:
http://www.spinics.net/lists/linux-omap/msg67822.html

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Tony Lindgren]

* Raja, Govindraj <govindraj.raja@ti.com> [120424 01:41]:
> On Tue, Apr 24, 2012 at 5:15 AM, Kevin Hilman <khilman@ti.com> wrote:
> > "Govindraj.R" <govindraj.raja@ti.com> writes:
> >
> >> From: "Govindraj.R" <govindraj.raja@ti.com>
> >>
> >> The following commit:
> >> (7496ba3 ?ARM: OMAP2+: UART: Add default mux for all uarts)
> >> added default pads for all uarts. But not all boards tend to
> >> use all uarts and most of unused uart pins are muxed for
> >> other purpose. This commit breaks the modules which where trying
> >> to use unused uart pins on their boards.
> >>
> >> So remove the default pads adding.
> >
> > I just noticed that this patch breaks runtime PM & wakeups for UART
> > console (at least on 3530/Overo with ttyO2 console.)
> >
> > By removing the pads, the initial device_init_wakeup() is not called on
> > port init. ?Without this call serial_omap_pm() disables runtime PM
> > because it checks device_may_wakeup().
> >
> > Since runtime PM was disabled, I manually re-enabled it and then enabled
> > wakeups:
> >
> > ?echo auto > /sys/devices/platform/omap_uart.2/power/control
> > ?echo enabled > /sys/devices/platform/omap_uart.2/tty/ttyO2/power/wakeup
> >
> > Then, after enabling auto-suspend timeouts, it seems wakeups are still
> > not working since the console hangs.
> >
> > Reverting $SUBJECT patch gets things working again.
> 
> This was decided as part of discussion [1]
> 
> If we are _reconsidering_ taking this patch [2]
> to dynamically probe uart pins and enable rx wakeup.
> 
> I can re-work on the patch[2] as per tony's comments[1]
> and re-post it.
 
Just to follow up on this.. Let's first get things working reliably,
and only then add more PM support.

We absolutely can't revert $SUBJECT because it's known to mess up
at least smsc911x and ehci on zoom3, hsi on n900 and probably
many other things.

For the -rc cycle, it seems that [2] is out of question at this point
as too intrusive. If the PM & wakeups are broken in the default cases,
then I suggest we just take few steps back and disable any deeper PM
states in the -rc series.

Regards,

Tony

 
> [1]:
> http://www.spinics.net/lists/linux-omap/msg68226.html
> 
> [2]:
> http://www.spinics.net/lists/linux-omap/msg67822.html

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Kevin Hilman]

Tony Lindgren <tony@atomide.com> writes:

> * Raja, Govindraj <govindraj.raja@ti.com> [120424 01:41]:
>> On Tue, Apr 24, 2012 at 5:15 AM, Kevin Hilman <khilman@ti.com> wrote:
>> > "Govindraj.R" <govindraj.raja@ti.com> writes:
>> >
>> >> From: "Govindraj.R" <govindraj.raja@ti.com>
>> >>
>> >> The following commit:
>> >> (7496ba3 ?ARM: OMAP2+: UART: Add default mux for all uarts)
>> >> added default pads for all uarts. But not all boards tend to
>> >> use all uarts and most of unused uart pins are muxed for
>> >> other purpose. This commit breaks the modules which where trying
>> >> to use unused uart pins on their boards.
>> >>
>> >> So remove the default pads adding.
>> >
>> > I just noticed that this patch breaks runtime PM & wakeups for UART
>> > console (at least on 3530/Overo with ttyO2 console.)
>> >
>> > By removing the pads, the initial device_init_wakeup() is not called on
>> > port init. ?Without this call serial_omap_pm() disables runtime PM
>> > because it checks device_may_wakeup().
>> >
>> > Since runtime PM was disabled, I manually re-enabled it and then enabled
>> > wakeups:
>> >
>> > ?echo auto > /sys/devices/platform/omap_uart.2/power/control
>> > ?echo enabled > /sys/devices/platform/omap_uart.2/tty/ttyO2/power/wakeup
>> >
>> > Then, after enabling auto-suspend timeouts, it seems wakeups are still
>> > not working since the console hangs.
>> >
>> > Reverting $SUBJECT patch gets things working again.
>> 
>> This was decided as part of discussion [1]
>> 
>> If we are _reconsidering_ taking this patch [2]
>> to dynamically probe uart pins and enable rx wakeup.
>> 
>> I can re-work on the patch[2] as per tony's comments[1]
>> and re-post it.
>  
> Just to follow up on this.. Let's first get things working reliably,
> and only then add more PM support.
>
> We absolutely can't revert $SUBJECT because it's known to mess up
> at least smsc911x and ehci on zoom3, hsi on n900 and probably
> many other things.
>
> For the -rc cycle, it seems that [2] is out of question at this point
> as too intrusive. If the PM & wakeups are broken in the default cases,
> then I suggest we just take few steps back and disable any deeper PM
> states in the -rc series.

Unfortunately, no need to do anything more to disable deeper PM states.

Because $SUBJECT disables runtime PM for UART, it keeps both PER and
CORE on all the time. :(

Kevin

[PATCH 1/2] OMAP2+: UART: Fix incorrect population of default uart pads

[Tony Lindgren]

* Kevin Hilman <khilman@ti.com> [120507 10:42]:
> Tony Lindgren <tony@atomide.com> writes:
> >  
> > Just to follow up on this.. Let's first get things working reliably,
> > and only then add more PM support.
> >
> > We absolutely can't revert $SUBJECT because it's known to mess up
> > at least smsc911x and ehci on zoom3, hsi on n900 and probably
> > many other things.
> >
> > For the -rc cycle, it seems that [2] is out of question at this point
> > as too intrusive. If the PM & wakeups are broken in the default cases,
> > then I suggest we just take few steps back and disable any deeper PM
> > states in the -rc series.
> 
> Unfortunately, no need to do anything more to disable deeper PM states.
> 
> Because $SUBJECT disables runtime PM for UART, it keeps both PER and
> CORE on all the time. :(

Oh well, it seems that that runtime PM can now be enabled on per-board
basis as it gets tested.

Regards,

Tony

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Govindraj.R]

From: "Govindraj.R" <govindraj.raja@ti.com>

Default pad populating procedure should first probe whether the uart
pins are available as uart tx/rx pins if yes then we can configure them
and use rx pin for wakeup capability.

Utilise the mux api available to probe the availability of mux pins
in uart mode.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Russ Dill <russ.dill@gmail.com>
Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
---
 arch/arm/mach-omap2/mux.c    |    3 +-
 arch/arm/mach-omap2/mux.h    |   10 +++++++
 arch/arm/mach-omap2/serial.c |   56 ++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 65 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
index 65c3391..d937ddd 100644
--- a/arch/arm/mach-omap2/mux.c
+++ b/arch/arm/mach-omap2/mux.c
@@ -217,8 +217,7 @@ static int __init _omap_mux_get_by_name(struct omap_mux_partition *partition,
 	return -ENODEV;
 }
 
-static int __init
-omap_mux_get_by_name(const char *muxname,
+int __init omap_mux_get_by_name(const char *muxname,
 			struct omap_mux_partition **found_partition,
 			struct omap_mux **found_mux)
 {
diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
index 69fe060..68927f1 100644
--- a/arch/arm/mach-omap2/mux.h
+++ b/arch/arm/mach-omap2/mux.h
@@ -225,8 +225,18 @@ omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads);
  */
 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state);
 
+int omap_mux_get_by_name(const char *muxname,
+		struct omap_mux_partition **found_partition,
+		struct omap_mux **found_mux);
 #else
 
+static inline int omap_mux_get_by_name(const char *muxname,
+		struct omap_mux_partition **found_partition,
+		struct omap_mux **found_mux)
+{
+	return 0;
+}
+
 static inline int omap_mux_init_gpio(int gpio, int val)
 {
 	return 0;
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 1554233..7bb971e 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -120,11 +120,63 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
 #endif /* CONFIG_PM */
 
 #ifdef CONFIG_OMAP_MUX
-static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
+
+#define OMAP_UART_DEFAULT_PAD_NAME_LEN	28
+static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
+		tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
+static struct omap_device_pad default_omap_uart_pads[2] __initdata;
+
+static void  __init omap_serial_fill_default_pads(struct omap_board_data *bdata)
 {
+	struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
+	struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
+
+	if (bdata->id != 2) {
+		snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
+			 "uart%d_rx.uart%d_rx", bdata->id + 1, bdata->id + 1);
+		snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
+			 "uart%d_tx.uart%d_tx", bdata->id + 1, bdata->id + 1);
+	} else {
+		snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
+			"uart%d_rx_irrx.uart%d_rx_irrx", bdata->id + 1,
+			bdata->id + 1);
+		snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
+			"uart%d_tx_irtx.uart%d_tx_irtx", bdata->id + 1,
+			bdata->id + 1);
+	}
+
+	if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
+			omap_mux_get_by_name
+				(tx_pad_name, &tx_partition, &tx_mux) >= 0) {
+		u16 tx_mode, rx_mode;
+
+		tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
+		rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
+
+		/*
+		 * Check if uart is used in default tx/rx mode i.e. in mux mode0
+		 * if yes then configure rx pin for wake up capability
+		 */
+		if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
+			default_omap_uart_pads[0].name = rx_pad_name;
+			default_omap_uart_pads[0].flags  =
+				OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP;
+			default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
+								OMAP_MUX_MODE0;
+			default_omap_uart_pads[0].idle = OMAP_PIN_INPUT |
+								OMAP_MUX_MODE0;
+
+			default_omap_uart_pads[1].name = tx_pad_name;
+			default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
+								OMAP_MUX_MODE0;
+			bdata->pads = default_omap_uart_pads;
+			bdata->pads_cnt = ARRAY_SIZE(default_omap_uart_pads);
+		}
+	}
 }
 #else
-static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
+static void __init omap_serial_fill_default_pads(struct omap_board_data *bdata)
+{}
 #endif
 
 char *cmdline_find_option(char *str)
-- 
1.7.9

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Tony Lindgren]

* Govindraj.R <govindraj.raja@ti.com> [120410 06:44]:
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -120,11 +120,63 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
>  #endif /* CONFIG_PM */
>  
>  #ifdef CONFIG_OMAP_MUX
> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
> +
> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN	28
> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
> +		tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
> +static struct omap_device_pad default_omap_uart_pads[2] __initdata;

Won't the default_omap_uart_pads get overwritten for each port?
We need that information in the driver too for each port? Why don't you
just allocate bdata.pads in omap_serial_board_init as we now assume it's
needed for each port?

> +static void  __init omap_serial_fill_default_pads(struct omap_board_data *bdata)
>  {
> +	struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
> +	struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
> +
> +	if (bdata->id != 2) {
> +		snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
> +			 "uart%d_rx.uart%d_rx", bdata->id + 1, bdata->id + 1);
> +		snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
> +			 "uart%d_tx.uart%d_tx", bdata->id + 1, bdata->id + 1);
> +	} else {
> +		snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
> +			"uart%d_rx_irrx.uart%d_rx_irrx", bdata->id + 1,
> +			bdata->id + 1);
> +		snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
> +			"uart%d_tx_irtx.uart%d_tx_irtx", bdata->id + 1,
> +			bdata->id + 1);
> +	}

This would be simpler with something like this (untested):

	char *rx_fmt, *tx_fmt;
	int uart_nr = bdata->id + 1;

	if (bdata->id == 2) {
		rx_fmt = "uart%d_rx.uart%d_rx";
		tx_fmt = "uart%d_tx.uart%d_tx";
        } else {
		rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
		tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
        }

	snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
			uart_nr, uart_nr);
	snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
			uart_nr, uart_nr);

> +	if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
> +			omap_mux_get_by_name
> +				(tx_pad_name, &tx_partition, &tx_mux) >= 0) {
> +		u16 tx_mode, rx_mode;
> +
> +		tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
> +		rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
> +
> +		/*
> +		 * Check if uart is used in default tx/rx mode i.e. in mux mode0
> +		 * if yes then configure rx pin for wake up capability
> +		 */
> +		if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
> +			default_omap_uart_pads[0].name = rx_pad_name;
> +			default_omap_uart_pads[0].flags  =
> +				OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP;
> +			default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
> +								OMAP_MUX_MODE0;
> +			default_omap_uart_pads[0].idle = OMAP_PIN_INPUT |
> +								OMAP_MUX_MODE0;
> +
> +			default_omap_uart_pads[1].name = tx_pad_name;
> +			default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
> +								OMAP_MUX_MODE0;
> +			bdata->pads = default_omap_uart_pads;
> +			bdata->pads_cnt = ARRAY_SIZE(default_omap_uart_pads);
> +		}
> +	}
>  }

Then looking at omap_serial_board_init, it still looks wrong:

void __init omap_serial_board_init(struct omap_uart_port_info *info)
{
	struct omap_uart_state *uart;
	struct omap_board_data bdata;

	list_for_each_entry(uart, &uart_list, node) {
		bdata.id = uart->num;
		bdata.flags = 0;
		bdata.pads = NULL;
		bdata.pads_cnt = 0;

		if (cpu_is_omap44xx() || cpu_is_omap34xx())
			omap_serial_fill_default_pads(&bdata);

Why don't you fill the pads for omap2? It has the same pads, although
it does not have the serial wake-up events working.

And why don't you exit if omap_serial_fill_default_pads fails for the
no info case?

Shouldn't it be something like:

		if (!info) {
			res = omap_serial_fill_default_pads(&bdata);
			if (!res)
				return;
			port = NULL;
		} else {
			port = &info[uart->num];		
		}
		omap_serial_init_port(&bdata, port);

Regards,

Tony

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Russ Dill]

On Tue, Apr 10, 2012 at 9:11 AM, Tony Lindgren <tony@atomide.com> wrote:
> * Govindraj.R <govindraj.raja@ti.com> [120410 06:44]:
>> --- a/arch/arm/mach-omap2/serial.c
>> +++ b/arch/arm/mach-omap2/serial.c
>> @@ -120,11 +120,63 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
>> ?#endif /* CONFIG_PM */
>>
>> ?#ifdef CONFIG_OMAP_MUX
>> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
>> +
>> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN ? ? ? 28
>> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
>> + ? ? ? ? ? ? tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
>> +static struct omap_device_pad default_omap_uart_pads[2] __initdata;
>
> Won't the default_omap_uart_pads get overwritten for each port?
> We need that information in the driver too for each port? Why don't you
> just allocate bdata.pads in omap_serial_board_init as we now assume it's
> needed for each port?

Because of the way the function is used, it doesn't. It does seem
somewhat fragile though, with non-obvious breakage possible in the
future if someone changes the way omap_serial_fill_default_pads is
called.

>> +static void ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata)
>> ?{
>> + ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
>> + ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
>> +
>> + ? ? if (bdata->id != 2) {
>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_rx.uart%d_rx", bdata->id + 1, bdata->id + 1);
>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_tx.uart%d_tx", bdata->id + 1, bdata->id + 1);
>> + ? ? } else {
>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? "uart%d_rx_irrx.uart%d_rx_irrx", bdata->id + 1,
>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? "uart%d_tx_irtx.uart%d_tx_irtx", bdata->id + 1,
>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>> + ? ? }
>
> This would be simpler with something like this (untested):
>
> ? ? ? ?char *rx_fmt, *tx_fmt;
> ? ? ? ?int uart_nr = bdata->id + 1;
>
> ? ? ? ?if (bdata->id == 2) {
> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx.uart%d_rx";
> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx.uart%d_tx";
> ? ? ? ?} else {
> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
> ? ? ? ?}
>
> ? ? ? ?snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
> ? ? ? ?snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
>
>> + ? ? if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
>> + ? ? ? ? ? ? ? ? ? ? omap_mux_get_by_name
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
>> + ? ? ? ? ? ? u16 tx_mode, rx_mode;
>> +
>> + ? ? ? ? ? ? tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
>> + ? ? ? ? ? ? rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
>> +
>> + ? ? ? ? ? ? /*
>> + ? ? ? ? ? ? ?* Check if uart is used in default tx/rx mode i.e. in mux mode0
>> + ? ? ? ? ? ? ?* if yes then configure rx pin for wake up capability
>> + ? ? ? ? ? ? ?*/
>> + ? ? ? ? ? ? if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].name = rx_pad_name;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].flags ?=
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].idle = OMAP_PIN_INPUT |
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>> +
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].name = tx_pad_name;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>> + ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap_uart_pads;
>> + ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_omap_uart_pads);
>> + ? ? ? ? ? ? }
>> + ? ? }
>> ?}
>
> Then looking at omap_serial_board_init, it still looks wrong:
>
> void __init omap_serial_board_init(struct omap_uart_port_info *info)
> {
> ? ? ? ?struct omap_uart_state *uart;
> ? ? ? ?struct omap_board_data bdata;
>
> ? ? ? ?list_for_each_entry(uart, &uart_list, node) {
> ? ? ? ? ? ? ? ?bdata.id = uart->num;
> ? ? ? ? ? ? ? ?bdata.flags = 0;
> ? ? ? ? ? ? ? ?bdata.pads = NULL;
> ? ? ? ? ? ? ? ?bdata.pads_cnt = 0;
>
> ? ? ? ? ? ? ? ?if (cpu_is_omap44xx() || cpu_is_omap34xx())
> ? ? ? ? ? ? ? ? ? ? ? ?omap_serial_fill_default_pads(&bdata);
>
> Why don't you fill the pads for omap2? It has the same pads, although
> it does not have the serial wake-up events working.
>
> And why don't you exit if omap_serial_fill_default_pads fails for the
> no info case?
>
> Shouldn't it be something like:
>
> ? ? ? ? ? ? ? ?if (!info) {
> ? ? ? ? ? ? ? ? ? ? ? ?res = omap_serial_fill_default_pads(&bdata);
> ? ? ? ? ? ? ? ? ? ? ? ?if (!res)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?return;
> ? ? ? ? ? ? ? ? ? ? ? ?port = NULL;
> ? ? ? ? ? ? ? ?} else {
> ? ? ? ? ? ? ? ? ? ? ? ?port = &info[uart->num];
> ? ? ? ? ? ? ? ?}
> ? ? ? ? ? ? ? ?omap_serial_init_port(&bdata, port);
>
> Regards,
>
> Tony

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Raja, Govindraj]

On Tue, Apr 10, 2012 at 9:41 PM, Tony Lindgren <tony@atomide.com> wrote:
> * Govindraj.R <govindraj.raja@ti.com> [120410 06:44]:
>> --- a/arch/arm/mach-omap2/serial.c
>> +++ b/arch/arm/mach-omap2/serial.c
>> @@ -120,11 +120,63 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
>> ?#endif /* CONFIG_PM */
>>
>> ?#ifdef CONFIG_OMAP_MUX
>> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
>> +
>> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN ? ? ? 28
>> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
>> + ? ? ? ? ? ? tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
>> +static struct omap_device_pad default_omap_uart_pads[2] __initdata;
>
> Won't the default_omap_uart_pads get overwritten for each port?
> We need that information in the driver too for each port? Why don't you
> just allocate bdata.pads in omap_serial_board_init as we now assume it's
> needed for each port?
>

Yes can be part of omap_uart_state structure.

>> +static void ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata)
>> ?{
>> + ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
>> + ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
>> +
>> + ? ? if (bdata->id != 2) {
>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_rx.uart%d_rx", bdata->id + 1, bdata->id + 1);
>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_tx.uart%d_tx", bdata->id + 1, bdata->id + 1);
>> + ? ? } else {
>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? "uart%d_rx_irrx.uart%d_rx_irrx", bdata->id + 1,
>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>> + ? ? ? ? ? ? ? ? ? ? "uart%d_tx_irtx.uart%d_tx_irtx", bdata->id + 1,
>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>> + ? ? }
>
> This would be simpler with something like this (untested):
>
> ? ? ? ?char *rx_fmt, *tx_fmt;
> ? ? ? ?int uart_nr = bdata->id + 1;
>
> ? ? ? ?if (bdata->id == 2) {
> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx.uart%d_rx";
> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx.uart%d_tx";
> ? ? ? ?} else {
> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
> ? ? ? ?}
>
> ? ? ? ?snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
> ? ? ? ?snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
>

okay fine.

>> + ? ? if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
>> + ? ? ? ? ? ? ? ? ? ? omap_mux_get_by_name
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
>> + ? ? ? ? ? ? u16 tx_mode, rx_mode;
>> +
>> + ? ? ? ? ? ? tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
>> + ? ? ? ? ? ? rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
>> +
>> + ? ? ? ? ? ? /*
>> + ? ? ? ? ? ? ?* Check if uart is used in default tx/rx mode i.e. in mux mode0
>> + ? ? ? ? ? ? ?* if yes then configure rx pin for wake up capability
>> + ? ? ? ? ? ? ?*/
>> + ? ? ? ? ? ? if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].name = rx_pad_name;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].flags ?=
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].idle = OMAP_PIN_INPUT |
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>> +
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].name = tx_pad_name;
>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>> + ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap_uart_pads;
>> + ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_omap_uart_pads);
>> + ? ? ? ? ? ? }
>> + ? ? }
>> ?}
>
> Then looking at omap_serial_board_init, it still looks wrong:
>
> void __init omap_serial_board_init(struct omap_uart_port_info *info)
> {
> ? ? ? ?struct omap_uart_state *uart;
> ? ? ? ?struct omap_board_data bdata;
>
> ? ? ? ?list_for_each_entry(uart, &uart_list, node) {
> ? ? ? ? ? ? ? ?bdata.id = uart->num;
> ? ? ? ? ? ? ? ?bdata.flags = 0;
> ? ? ? ? ? ? ? ?bdata.pads = NULL;
> ? ? ? ? ? ? ? ?bdata.pads_cnt = 0;
>
> ? ? ? ? ? ? ? ?if (cpu_is_omap44xx() || cpu_is_omap34xx())
> ? ? ? ? ? ? ? ? ? ? ? ?omap_serial_fill_default_pads(&bdata);
>
> Why don't you fill the pads for omap2? It has the same pads, although
> it does not have the serial wake-up events working.
>
> And why don't you exit if omap_serial_fill_default_pads fails for the
> no info case?
>
> Shouldn't it be something like:
>
> ? ? ? ? ? ? ? ?if (!info) {
> ? ? ? ? ? ? ? ? ? ? ? ?res = omap_serial_fill_default_pads(&bdata);
> ? ? ? ? ? ? ? ? ? ? ? ?if (!res)
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?return;
> ? ? ? ? ? ? ? ? ? ? ? ?port = NULL;
> ? ? ? ? ? ? ? ?} else {
> ? ? ? ? ? ? ? ? ? ? ? ?port = &info[uart->num];
> ? ? ? ? ? ? ? ?}
> ? ? ? ? ? ? ? ?omap_serial_init_port(&bdata, port);
>

Yes if filling of default pads fails we can avoid registering that port
however I think that should not depend on availability of port info.

Here [1] is the updated patch.

--
Thanks,
Govindraj.R


[1]:


>From ea06c7d5014b68f622b3e2ca226e5a5194d48e9a Mon Sep 17 00:00:00 2001
From: "Govindraj.R" <govindraj.raja@ti.com>
Date: Tue, 10 Apr 2012 18:21:52 +0530
Subject: [PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and
 configure rx wakeup

Default pad populating procedure should first probe whether the uart
pins are available as uart tx/rx pins if yes then we can configure them
and use rx pin for wakeup capability.

Utilise the mux api available to probe the availability of mux pins
in uart mode.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Russ Dill <russ.dill@gmail.com>
Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
---
 arch/arm/mach-omap2/mux.c    |    3 +-
 arch/arm/mach-omap2/mux.h    |   10 ++++++
 arch/arm/mach-omap2/serial.c |   73 +++++++++++++++++++++++++++++++++++++++--
 3 files changed, 80 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
index 65c3391..d937ddd 100644
--- a/arch/arm/mach-omap2/mux.c
+++ b/arch/arm/mach-omap2/mux.c
@@ -217,8 +217,7 @@ static int __init _omap_mux_get_by_name(struct
omap_mux_partition *partition,
 	return -ENODEV;
 }

-static int __init
-omap_mux_get_by_name(const char *muxname,
+int __init omap_mux_get_by_name(const char *muxname,
 			struct omap_mux_partition **found_partition,
 			struct omap_mux **found_mux)
 {
diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
index 69fe060..68927f1 100644
--- a/arch/arm/mach-omap2/mux.h
+++ b/arch/arm/mach-omap2/mux.h
@@ -225,8 +225,18 @@ omap_hwmod_mux_init(struct omap_device_pad
*bpads, int nr_pads);
  */
 void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state);

+int omap_mux_get_by_name(const char *muxname,
+		struct omap_mux_partition **found_partition,
+		struct omap_mux **found_mux);
 #else

+static inline int omap_mux_get_by_name(const char *muxname,
+		struct omap_mux_partition **found_partition,
+		struct omap_mux **found_mux)
+{
+	return 0;
+}
+
 static inline int omap_mux_init_gpio(int gpio, int val)
 {
 	return 0;
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 2e351f5..9d62cae 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -57,6 +57,7 @@ struct omap_uart_state {

 	struct list_head node;
 	struct omap_hwmod *oh;
+	struct omap_device_pad default_omap_uart_pads[2];
 };

 static LIST_HEAD(uart_list);
@@ -120,11 +121,75 @@ static void omap_uart_set_smartidle(struct
platform_device *pdev) {}
 #endif /* CONFIG_PM */

 #ifdef CONFIG_OMAP_MUX
-static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
+
+#define OMAP_UART_DEFAULT_PAD_NAME_LEN	28
+static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
+		tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
+
+static void  __init
+omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
+				struct omap_uart_state *uart)
 {
+	uart->default_omap_uart_pads[0].name = rx_pad_name;
+	uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX |
+							OMAP_DEVICE_PAD_WAKEUP;
+	uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
+							OMAP_MUX_MODE0;
+	uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0;
+	uart->default_omap_uart_pads[1].name = tx_pad_name;
+	uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
+							OMAP_MUX_MODE0;
+	bdata->pads = uart->default_omap_uart_pads;
+	bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
+}
+
+static int  __init omap_serial_fill_default_pads(struct omap_board_data *bdata,
+						struct omap_uart_state *uart)
+{
+	struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
+	struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
+	char *rx_fmt, *tx_fmt;
+	int uart_nr = bdata->id + 1;
+
+	if (bdata->id != 2) {
+		rx_fmt = "uart%d_rx.uart%d_rx";
+		tx_fmt = "uart%d_tx.uart%d_tx";
+	} else {
+		rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
+		tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
+	}
+
+	snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
+			uart_nr, uart_nr);
+	snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
+			uart_nr, uart_nr);
+
+	if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
+			omap_mux_get_by_name
+				(tx_pad_name, &tx_partition, &tx_mux) >= 0) {
+		u16 tx_mode, rx_mode;
+
+		tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
+		rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
+
+		/*
+		 * Check if uart is used in default tx/rx mode i.e. in mux mode0
+		 * if yes then configure rx pin for wake up capability
+		 */
+		if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
+			omap_serial_fill_uart_tx_rx_pads(bdata, uart);
+			return 0;
+		}
+	}
+
+	return -ENODEV;
 }
 #else
-static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
+static int __init omap_serial_fill_default_pads(struct omap_board_data *bdata
+					struct omap_uart_state *uart)
+{
+	return 0;
+}
 #endif

 char *cmdline_find_option(char *str)
@@ -289,8 +354,8 @@ void __init omap_serial_board_init(struct
omap_uart_port_info *info)
 		bdata.pads = NULL;
 		bdata.pads_cnt = 0;

-		if (cpu_is_omap44xx() || cpu_is_omap34xx())
-			omap_serial_fill_default_pads(&bdata);
+		if (omap_serial_fill_default_pads(&bdata, uart))
+			continue;

 		if (!info)
 			omap_serial_init_port(&bdata, NULL);
-- 
1.7.9

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Russ Dill]

On Wed, Apr 11, 2012 at 4:50 AM, Raja, Govindraj <govindraj.raja@ti.com> wrote:
> On Tue, Apr 10, 2012 at 9:41 PM, Tony Lindgren <tony@atomide.com> wrote:
>> * Govindraj.R <govindraj.raja@ti.com> [120410 06:44]:
>>> --- a/arch/arm/mach-omap2/serial.c
>>> +++ b/arch/arm/mach-omap2/serial.c
>>> @@ -120,11 +120,63 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
>>> ?#endif /* CONFIG_PM */
>>>
>>> ?#ifdef CONFIG_OMAP_MUX
>>> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
>>> +
>>> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN ? ? ? 28
>>> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
>>> + ? ? ? ? ? ? tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
>>> +static struct omap_device_pad default_omap_uart_pads[2] __initdata;
>>
>> Won't the default_omap_uart_pads get overwritten for each port?
>> We need that information in the driver too for each port? Why don't you
>> just allocate bdata.pads in omap_serial_board_init as we now assume it's
>> needed for each port?
>>
>
> Yes can be part of omap_uart_state structure.
>
>>> +static void ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata)
>>> ?{
>>> + ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
>>> + ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
>>> +
>>> + ? ? if (bdata->id != 2) {
>>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_rx.uart%d_rx", bdata->id + 1, bdata->id + 1);
>>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_tx.uart%d_tx", bdata->id + 1, bdata->id + 1);
>>> + ? ? } else {
>>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? "uart%d_rx_irrx.uart%d_rx_irrx", bdata->id + 1,
>>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? "uart%d_tx_irtx.uart%d_tx_irtx", bdata->id + 1,
>>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>>> + ? ? }
>>
>> This would be simpler with something like this (untested):
>>
>> ? ? ? ?char *rx_fmt, *tx_fmt;
>> ? ? ? ?int uart_nr = bdata->id + 1;
>>
>> ? ? ? ?if (bdata->id == 2) {
>> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx.uart%d_rx";
>> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx.uart%d_tx";
>> ? ? ? ?} else {
>> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
>> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
>> ? ? ? ?}
>>
>> ? ? ? ?snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
>> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
>> ? ? ? ?snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
>> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
>>
>
> okay fine.
>
>>> + ? ? if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
>>> + ? ? ? ? ? ? ? ? ? ? omap_mux_get_by_name
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
>>> + ? ? ? ? ? ? u16 tx_mode, rx_mode;
>>> +
>>> + ? ? ? ? ? ? tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
>>> + ? ? ? ? ? ? rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
>>> +
>>> + ? ? ? ? ? ? /*
>>> + ? ? ? ? ? ? ?* Check if uart is used in default tx/rx mode i.e. in mux mode0
>>> + ? ? ? ? ? ? ?* if yes then configure rx pin for wake up capability
>>> + ? ? ? ? ? ? ?*/
>>> + ? ? ? ? ? ? if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].name = rx_pad_name;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].flags ?=
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].idle = OMAP_PIN_INPUT |
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>>> +
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].name = tx_pad_name;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>>> + ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap_uart_pads;
>>> + ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_omap_uart_pads);
>>> + ? ? ? ? ? ? }
>>> + ? ? }
>>> ?}
>>
>> Then looking at omap_serial_board_init, it still looks wrong:
>>
>> void __init omap_serial_board_init(struct omap_uart_port_info *info)
>> {
>> ? ? ? ?struct omap_uart_state *uart;
>> ? ? ? ?struct omap_board_data bdata;
>>
>> ? ? ? ?list_for_each_entry(uart, &uart_list, node) {
>> ? ? ? ? ? ? ? ?bdata.id = uart->num;
>> ? ? ? ? ? ? ? ?bdata.flags = 0;
>> ? ? ? ? ? ? ? ?bdata.pads = NULL;
>> ? ? ? ? ? ? ? ?bdata.pads_cnt = 0;
>>
>> ? ? ? ? ? ? ? ?if (cpu_is_omap44xx() || cpu_is_omap34xx())
>> ? ? ? ? ? ? ? ? ? ? ? ?omap_serial_fill_default_pads(&bdata);
>>
>> Why don't you fill the pads for omap2? It has the same pads, although
>> it does not have the serial wake-up events working.
>>
>> And why don't you exit if omap_serial_fill_default_pads fails for the
>> no info case?
>>
>> Shouldn't it be something like:
>>
>> ? ? ? ? ? ? ? ?if (!info) {
>> ? ? ? ? ? ? ? ? ? ? ? ?res = omap_serial_fill_default_pads(&bdata);
>> ? ? ? ? ? ? ? ? ? ? ? ?if (!res)
>> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?return;
>> ? ? ? ? ? ? ? ? ? ? ? ?port = NULL;
>> ? ? ? ? ? ? ? ?} else {
>> ? ? ? ? ? ? ? ? ? ? ? ?port = &info[uart->num];
>> ? ? ? ? ? ? ? ?}
>> ? ? ? ? ? ? ? ?omap_serial_init_port(&bdata, port);
>>
>
> Yes if filling of default pads fails we can avoid registering that port
> however I think that should not depend on availability of port info.
>
> Here [1] is the updated patch.
>
> --
> Thanks,
> Govindraj.R
>
>
> [1]:
>
>
> From ea06c7d5014b68f622b3e2ca226e5a5194d48e9a Mon Sep 17 00:00:00 2001
> From: "Govindraj.R" <govindraj.raja@ti.com>
> Date: Tue, 10 Apr 2012 18:21:52 +0530
> Subject: [PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and
> ?configure rx wakeup
>
> Default pad populating procedure should first probe whether the uart
> pins are available as uart tx/rx pins if yes then we can configure them
> and use rx pin for wakeup capability.
>
> Utilise the mux api available to probe the availability of mux pins
> in uart mode.
>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Kevin Hilman <khilman@ti.com>
> Cc: Russ Dill <russ.dill@gmail.com>
> Reported-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>

This patch has been seriously damaged by your mailer. What mailer are you using?
Tested against master on xM for USB and NFS boot.

Signed-off-by: Russ.Dill at ti.com

> ---
> ?arch/arm/mach-omap2/mux.c ? ?| ? ?3 +-
> ?arch/arm/mach-omap2/mux.h ? ?| ? 10 ++++++
> ?arch/arm/mach-omap2/serial.c | ? 73 +++++++++++++++++++++++++++++++++++++++--
> ?3 files changed, 80 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
> index 65c3391..d937ddd 100644
> --- a/arch/arm/mach-omap2/mux.c
> +++ b/arch/arm/mach-omap2/mux.c
> @@ -217,8 +217,7 @@ static int __init _omap_mux_get_by_name(struct
> omap_mux_partition *partition,
> ? ? ? ?return -ENODEV;
> ?}
>
> -static int __init
> -omap_mux_get_by_name(const char *muxname,
> +int __init omap_mux_get_by_name(const char *muxname,
> ? ? ? ? ? ? ? ? ? ? ? ?struct omap_mux_partition **found_partition,
> ? ? ? ? ? ? ? ? ? ? ? ?struct omap_mux **found_mux)
> ?{
> diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
> index 69fe060..68927f1 100644
> --- a/arch/arm/mach-omap2/mux.h
> +++ b/arch/arm/mach-omap2/mux.h
> @@ -225,8 +225,18 @@ omap_hwmod_mux_init(struct omap_device_pad
> *bpads, int nr_pads);
> ?*/
> ?void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state);
>
> +int omap_mux_get_by_name(const char *muxname,
> + ? ? ? ? ? ? ? struct omap_mux_partition **found_partition,
> + ? ? ? ? ? ? ? struct omap_mux **found_mux);
> ?#else
>
> +static inline int omap_mux_get_by_name(const char *muxname,
> + ? ? ? ? ? ? ? struct omap_mux_partition **found_partition,
> + ? ? ? ? ? ? ? struct omap_mux **found_mux)
> +{
> + ? ? ? return 0;
> +}
> +
> ?static inline int omap_mux_init_gpio(int gpio, int val)
> ?{
> ? ? ? ?return 0;
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index 2e351f5..9d62cae 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -57,6 +57,7 @@ struct omap_uart_state {
>
> ? ? ? ?struct list_head node;
> ? ? ? ?struct omap_hwmod *oh;
> + ? ? ? struct omap_device_pad default_omap_uart_pads[2];
> ?};
>
> ?static LIST_HEAD(uart_list);
> @@ -120,11 +121,75 @@ static void omap_uart_set_smartidle(struct
> platform_device *pdev) {}
> ?#endif /* CONFIG_PM */
>
> ?#ifdef CONFIG_OMAP_MUX
> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
> +
> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN 28
> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
> + ? ? ? ? ? ? ? tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
> +
> +static void ?__init
> +omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> ?{
> + ? ? ? uart->default_omap_uart_pads[0].name = rx_pad_name;
> + ? ? ? uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX |
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_DEVICE_PAD_WAKEUP;
> + ? ? ? uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
> + ? ? ? uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0;
> + ? ? ? uart->default_omap_uart_pads[1].name = tx_pad_name;
> + ? ? ? uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
> + ? ? ? bdata->pads = uart->default_omap_uart_pads;
> + ? ? ? bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
> +}
> +
> +static int ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> +{
> + ? ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
> + ? ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
> + ? ? ? char *rx_fmt, *tx_fmt;
> + ? ? ? int uart_nr = bdata->id + 1;
> +
> + ? ? ? if (bdata->id != 2) {
> + ? ? ? ? ? ? ? rx_fmt = "uart%d_rx.uart%d_rx";
> + ? ? ? ? ? ? ? tx_fmt = "uart%d_tx.uart%d_tx";
> + ? ? ? } else {
> + ? ? ? ? ? ? ? rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
> + ? ? ? ? ? ? ? tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
> + ? ? ? }
> +
> + ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
> + ? ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
> + ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
> + ? ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
> +
> + ? ? ? if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
> + ? ? ? ? ? ? ? ? ? ? ? omap_mux_get_by_name
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
> + ? ? ? ? ? ? ? u16 tx_mode, rx_mode;
> +
> + ? ? ? ? ? ? ? tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
> + ? ? ? ? ? ? ? rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
> +
> + ? ? ? ? ? ? ? /*
> + ? ? ? ? ? ? ? ?* Check if uart is used in default tx/rx mode i.e. in mux mode0
> + ? ? ? ? ? ? ? ?* if yes then configure rx pin for wake up capability
> + ? ? ? ? ? ? ? ?*/
> + ? ? ? ? ? ? ? if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
> + ? ? ? ? ? ? ? ? ? ? ? omap_serial_fill_uart_tx_rx_pads(bdata, uart);
> + ? ? ? ? ? ? ? ? ? ? ? return 0;
> + ? ? ? ? ? ? ? }
> + ? ? ? }
> +
> + ? ? ? return -ENODEV;
> ?}
> ?#else
> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
> +static int __init omap_serial_fill_default_pads(struct omap_board_data *bdata
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> +{
> + ? ? ? return 0;
> +}
> ?#endif
>
> ?char *cmdline_find_option(char *str)
> @@ -289,8 +354,8 @@ void __init omap_serial_board_init(struct
> omap_uart_port_info *info)
> ? ? ? ? ? ? ? ?bdata.pads = NULL;
> ? ? ? ? ? ? ? ?bdata.pads_cnt = 0;
>
> - ? ? ? ? ? ? ? if (cpu_is_omap44xx() || cpu_is_omap34xx())
> - ? ? ? ? ? ? ? ? ? ? ? omap_serial_fill_default_pads(&bdata);
> + ? ? ? ? ? ? ? if (omap_serial_fill_default_pads(&bdata, uart))
> + ? ? ? ? ? ? ? ? ? ? ? continue;
>
> ? ? ? ? ? ? ? ?if (!info)
> ? ? ? ? ? ? ? ? ? ? ? ?omap_serial_init_port(&bdata, NULL);
> --
> 1.7.9

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Russ Dill]

On Wed, Apr 11, 2012 at 4:50 AM, Raja, Govindraj <govindraj.raja@ti.com> wrote:
> On Tue, Apr 10, 2012 at 9:41 PM, Tony Lindgren <tony@atomide.com> wrote:
>> * Govindraj.R <govindraj.raja@ti.com> [120410 06:44]:
>>> --- a/arch/arm/mach-omap2/serial.c
>>> +++ b/arch/arm/mach-omap2/serial.c
>>> @@ -120,11 +120,63 @@ static void omap_uart_set_smartidle(struct platform_device *pdev) {}
>>> ?#endif /* CONFIG_PM */
>>>
>>> ?#ifdef CONFIG_OMAP_MUX
>>> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
>>> +
>>> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN ? ? ? 28
>>> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
>>> + ? ? ? ? ? ? tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
>>> +static struct omap_device_pad default_omap_uart_pads[2] __initdata;
>>
>> Won't the default_omap_uart_pads get overwritten for each port?
>> We need that information in the driver too for each port? Why don't you
>> just allocate bdata.pads in omap_serial_board_init as we now assume it's
>> needed for each port?
>>
>
> Yes can be part of omap_uart_state structure.
>
>>> +static void ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata)
>>> ?{
>>> + ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
>>> + ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
>>> +
>>> + ? ? if (bdata->id != 2) {
>>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_rx.uart%d_rx", bdata->id + 1, bdata->id + 1);
>>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? ?"uart%d_tx.uart%d_tx", bdata->id + 1, bdata->id + 1);
>>> + ? ? } else {
>>> + ? ? ? ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? "uart%d_rx_irrx.uart%d_rx_irrx", bdata->id + 1,
>>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>>> + ? ? ? ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN,
>>> + ? ? ? ? ? ? ? ? ? ? "uart%d_tx_irtx.uart%d_tx_irtx", bdata->id + 1,
>>> + ? ? ? ? ? ? ? ? ? ? bdata->id + 1);
>>> + ? ? }
>>
>> This would be simpler with something like this (untested):
>>
>> ? ? ? ?char *rx_fmt, *tx_fmt;
>> ? ? ? ?int uart_nr = bdata->id + 1;
>>
>> ? ? ? ?if (bdata->id == 2) {
>> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx.uart%d_rx";
>> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx.uart%d_tx";
>> ? ? ? ?} else {
>> ? ? ? ? ? ? ? ?rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
>> ? ? ? ? ? ? ? ?tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
>> ? ? ? ?}
>>
>> ? ? ? ?snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
>> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
>> ? ? ? ?snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
>> ? ? ? ? ? ? ? ? ? ? ? ?uart_nr, uart_nr);
>>
>
> okay fine.
>
>>> + ? ? if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
>>> + ? ? ? ? ? ? ? ? ? ? omap_mux_get_by_name
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
>>> + ? ? ? ? ? ? u16 tx_mode, rx_mode;
>>> +
>>> + ? ? ? ? ? ? tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
>>> + ? ? ? ? ? ? rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
>>> +
>>> + ? ? ? ? ? ? /*
>>> + ? ? ? ? ? ? ?* Check if uart is used in default tx/rx mode i.e. in mux mode0
>>> + ? ? ? ? ? ? ?* if yes then configure rx pin for wake up capability
>>> + ? ? ? ? ? ? ?*/
>>> + ? ? ? ? ? ? if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].name = rx_pad_name;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].flags ?=
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[0].idle = OMAP_PIN_INPUT |
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>>> +
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].name = tx_pad_name;
>>> + ? ? ? ? ? ? ? ? ? ? default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
>>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
>>> + ? ? ? ? ? ? ? ? ? ? bdata->pads = default_omap_uart_pads;
>>> + ? ? ? ? ? ? ? ? ? ? bdata->pads_cnt = ARRAY_SIZE(default_omap_uart_pads);
>>> + ? ? ? ? ? ? }
>>> + ? ? }
>>> ?}
>>
>> Then looking at omap_serial_board_init, it still looks wrong:
>>
>> void __init omap_serial_board_init(struct omap_uart_port_info *info)
>> {
>> ? ? ? ?struct omap_uart_state *uart;
>> ? ? ? ?struct omap_board_data bdata;
>>
>> ? ? ? ?list_for_each_entry(uart, &uart_list, node) {
>> ? ? ? ? ? ? ? ?bdata.id = uart->num;
>> ? ? ? ? ? ? ? ?bdata.flags = 0;
>> ? ? ? ? ? ? ? ?bdata.pads = NULL;
>> ? ? ? ? ? ? ? ?bdata.pads_cnt = 0;
>>
>> ? ? ? ? ? ? ? ?if (cpu_is_omap44xx() || cpu_is_omap34xx())
>> ? ? ? ? ? ? ? ? ? ? ? ?omap_serial_fill_default_pads(&bdata);
>>
>> Why don't you fill the pads for omap2? It has the same pads, although
>> it does not have the serial wake-up events working.
>>
>> And why don't you exit if omap_serial_fill_default_pads fails for the
>> no info case?
>>
>> Shouldn't it be something like:
>>
>> ? ? ? ? ? ? ? ?if (!info) {
>> ? ? ? ? ? ? ? ? ? ? ? ?res = omap_serial_fill_default_pads(&bdata);
>> ? ? ? ? ? ? ? ? ? ? ? ?if (!res)
>> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?return;
>> ? ? ? ? ? ? ? ? ? ? ? ?port = NULL;
>> ? ? ? ? ? ? ? ?} else {
>> ? ? ? ? ? ? ? ? ? ? ? ?port = &info[uart->num];
>> ? ? ? ? ? ? ? ?}
>> ? ? ? ? ? ? ? ?omap_serial_init_port(&bdata, port);
>>
>
> Yes if filling of default pads fails we can avoid registering that port
> however I think that should not depend on availability of port info.
>
> Here [1] is the updated patch.
>
> --
> Thanks,
> Govindraj.R
>
>
> [1]:
>
>
> From ea06c7d5014b68f622b3e2ca226e5a5194d48e9a Mon Sep 17 00:00:00 2001
> From: "Govindraj.R" <govindraj.raja@ti.com>
> Date: Tue, 10 Apr 2012 18:21:52 +0530
> Subject: [PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and
> ?configure rx wakeup
>
> Default pad populating procedure should first probe whether the uart
> pins are available as uart tx/rx pins if yes then we can configure them
> and use rx pin for wakeup capability.
>
> Utilise the mux api available to probe the availability of mux pins
> in uart mode.
>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Kevin Hilman <khilman@ti.com>
> Cc: Russ Dill <russ.dill@gmail.com>
> Reported-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Govindraj.R <govindraj.raja@ti.com>

Reviewed-by: Russ Dill <russ.dill@ti.com>
Tested-by: Russ Dill <russ.dill@ti.com>

> ---
> ?arch/arm/mach-omap2/mux.c ? ?| ? ?3 +-
> ?arch/arm/mach-omap2/mux.h ? ?| ? 10 ++++++
> ?arch/arm/mach-omap2/serial.c | ? 73 +++++++++++++++++++++++++++++++++++++++--
> ?3 files changed, 80 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
> index 65c3391..d937ddd 100644
> --- a/arch/arm/mach-omap2/mux.c
> +++ b/arch/arm/mach-omap2/mux.c
> @@ -217,8 +217,7 @@ static int __init _omap_mux_get_by_name(struct
> omap_mux_partition *partition,
> ? ? ? ?return -ENODEV;
> ?}
>
> -static int __init
> -omap_mux_get_by_name(const char *muxname,
> +int __init omap_mux_get_by_name(const char *muxname,
> ? ? ? ? ? ? ? ? ? ? ? ?struct omap_mux_partition **found_partition,
> ? ? ? ? ? ? ? ? ? ? ? ?struct omap_mux **found_mux)
> ?{
> diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
> index 69fe060..68927f1 100644
> --- a/arch/arm/mach-omap2/mux.h
> +++ b/arch/arm/mach-omap2/mux.h
> @@ -225,8 +225,18 @@ omap_hwmod_mux_init(struct omap_device_pad
> *bpads, int nr_pads);
> ?*/
> ?void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state);
>
> +int omap_mux_get_by_name(const char *muxname,
> + ? ? ? ? ? ? ? struct omap_mux_partition **found_partition,
> + ? ? ? ? ? ? ? struct omap_mux **found_mux);
> ?#else
>
> +static inline int omap_mux_get_by_name(const char *muxname,
> + ? ? ? ? ? ? ? struct omap_mux_partition **found_partition,
> + ? ? ? ? ? ? ? struct omap_mux **found_mux)
> +{
> + ? ? ? return 0;
> +}
> +
> ?static inline int omap_mux_init_gpio(int gpio, int val)
> ?{
> ? ? ? ?return 0;
> diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
> index 2e351f5..9d62cae 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -57,6 +57,7 @@ struct omap_uart_state {
>
> ? ? ? ?struct list_head node;
> ? ? ? ?struct omap_hwmod *oh;
> + ? ? ? struct omap_device_pad default_omap_uart_pads[2];
> ?};
>
> ?static LIST_HEAD(uart_list);
> @@ -120,11 +121,75 @@ static void omap_uart_set_smartidle(struct
> platform_device *pdev) {}
> ?#endif /* CONFIG_PM */
>
> ?#ifdef CONFIG_OMAP_MUX
> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
> +
> +#define OMAP_UART_DEFAULT_PAD_NAME_LEN 28
> +static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
> + ? ? ? ? ? ? ? tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
> +
> +static void ?__init
> +omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> ?{
> + ? ? ? uart->default_omap_uart_pads[0].name = rx_pad_name;
> + ? ? ? uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX |
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_DEVICE_PAD_WAKEUP;
> + ? ? ? uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
> + ? ? ? uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0;
> + ? ? ? uart->default_omap_uart_pads[1].name = tx_pad_name;
> + ? ? ? uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? OMAP_MUX_MODE0;
> + ? ? ? bdata->pads = uart->default_omap_uart_pads;
> + ? ? ? bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
> +}
> +
> +static int ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> +{
> + ? ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
> + ? ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
> + ? ? ? char *rx_fmt, *tx_fmt;
> + ? ? ? int uart_nr = bdata->id + 1;
> +
> + ? ? ? if (bdata->id != 2) {
> + ? ? ? ? ? ? ? rx_fmt = "uart%d_rx.uart%d_rx";
> + ? ? ? ? ? ? ? tx_fmt = "uart%d_tx.uart%d_tx";
> + ? ? ? } else {
> + ? ? ? ? ? ? ? rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
> + ? ? ? ? ? ? ? tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
> + ? ? ? }
> +
> + ? ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
> + ? ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
> + ? ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
> + ? ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
> +
> + ? ? ? if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
> + ? ? ? ? ? ? ? ? ? ? ? omap_mux_get_by_name
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (tx_pad_name, &tx_partition, &tx_mux) >= 0) {
> + ? ? ? ? ? ? ? u16 tx_mode, rx_mode;
> +
> + ? ? ? ? ? ? ? tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
> + ? ? ? ? ? ? ? rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
> +
> + ? ? ? ? ? ? ? /*
> + ? ? ? ? ? ? ? ?* Check if uart is used in default tx/rx mode i.e. in mux mode0
> + ? ? ? ? ? ? ? ?* if yes then configure rx pin for wake up capability
> + ? ? ? ? ? ? ? ?*/
> + ? ? ? ? ? ? ? if (!(rx_mode & 0x07) && !(tx_mode & 0x07)) {
> + ? ? ? ? ? ? ? ? ? ? ? omap_serial_fill_uart_tx_rx_pads(bdata, uart);
> + ? ? ? ? ? ? ? ? ? ? ? return 0;
> + ? ? ? ? ? ? ? }
> + ? ? ? }
> +
> + ? ? ? return -ENODEV;
> ?}
> ?#else
> -static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
> +static int __init omap_serial_fill_default_pads(struct omap_board_data *bdata
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> +{
> + ? ? ? return 0;
> +}
> ?#endif
>
> ?char *cmdline_find_option(char *str)
> @@ -289,8 +354,8 @@ void __init omap_serial_board_init(struct
> omap_uart_port_info *info)
> ? ? ? ? ? ? ? ?bdata.pads = NULL;
> ? ? ? ? ? ? ? ?bdata.pads_cnt = 0;
>
> - ? ? ? ? ? ? ? if (cpu_is_omap44xx() || cpu_is_omap34xx())
> - ? ? ? ? ? ? ? ? ? ? ? omap_serial_fill_default_pads(&bdata);
> + ? ? ? ? ? ? ? if (omap_serial_fill_default_pads(&bdata, uart))
> + ? ? ? ? ? ? ? ? ? ? ? continue;
>
> ? ? ? ? ? ? ? ?if (!info)
> ? ? ? ? ? ? ? ? ? ? ? ?omap_serial_init_port(&bdata, NULL);
> --
> 1.7.9

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Tony Lindgren]

Hi,

Few more comments below.

* Raja, Govindraj <govindraj.raja@ti.com> [120411 04:53]:
...
 
> +static int  __init omap_serial_fill_default_pads(struct omap_board_data *bdata,
> +						struct omap_uart_state *uart)
> +{
> +	struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
> +	struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
> +	char *rx_fmt, *tx_fmt;
> +	int uart_nr = bdata->id + 1;
> +
> +	if (bdata->id != 2) {
> +		rx_fmt = "uart%d_rx.uart%d_rx";
> +		tx_fmt = "uart%d_tx.uart%d_tx";
> +	} else {
> +		rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
> +		tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
> +	}
> +
> +	snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
> +			uart_nr, uart_nr);
> +	snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
> +			uart_nr, uart_nr);

This naming won't work for the fourth port on 3630 as there are no "uart4_rx"
or "uart4_tx" mux entries, they are "gpmc_wait2.uart4_tx" and
"gpmc_wait3.uart4_tx".

> @@ -289,8 +354,8 @@ void __init omap_serial_board_init(struct
> omap_uart_port_info *info)
>  		bdata.pads = NULL;
>  		bdata.pads_cnt = 0;
> 
> -		if (cpu_is_omap44xx() || cpu_is_omap34xx())
> -			omap_serial_fill_default_pads(&bdata);
> +		if (omap_serial_fill_default_pads(&bdata, uart))
> +			continue;
> 
>  		if (!info)
>  			omap_serial_init_port(&bdata, NULL);

Can't the omap_serial_board_init() now be just be omap_serial_init(void)
as it's not used anywhere else?

Anyways, this is getting too complex for the -rc series as at least 2430sdp
is using alternative pins for the first uart. Let's patch to remove just
the uart4 entry for 3630 for the -rc and then we can properly fix this
for the next merge window.

Regards,

Tony

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Raja, Govindraj]

On Tue, Apr 17, 2012 at 7:11 AM, Tony Lindgren <tony@atomide.com> wrote:
> Hi,
>
> Few more comments below.
>
> * Raja, Govindraj <govindraj.raja@ti.com> [120411 04:53]:
> ...
>
>> +static int ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata,
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
>> +{
>> + ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
>> + ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
>> + ? ? char *rx_fmt, *tx_fmt;
>> + ? ? int uart_nr = bdata->id + 1;
>> +
>> + ? ? if (bdata->id != 2) {
>> + ? ? ? ? ? ? rx_fmt = "uart%d_rx.uart%d_rx";
>> + ? ? ? ? ? ? tx_fmt = "uart%d_tx.uart%d_tx";
>> + ? ? } else {
>> + ? ? ? ? ? ? rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
>> + ? ? ? ? ? ? tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
>> + ? ? }
>> +
>> + ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
>> + ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
>> + ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
>> + ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
>
> This naming won't work for the fourth port on 3630 as there are no "uart4_rx"
> or "uart4_tx" mux entries, they are "gpmc_wait2.uart4_tx" and
> "gpmc_wait3.uart4_tx".

But uart4 is unused on 3630 boards and boards trying to use them
should configure them from board file.
(I thought we agreed on this approach where only if uarts are
available in mux mode0 those ports will be dynamically muxed for wakeup
others should use omap_serial_init_port)

>
>> @@ -289,8 +354,8 @@ void __init omap_serial_board_init(struct
>> omap_uart_port_info *info)
>> ? ? ? ? ? ? ? bdata.pads = NULL;
>> ? ? ? ? ? ? ? bdata.pads_cnt = 0;
>>
>> - ? ? ? ? ? ? if (cpu_is_omap44xx() || cpu_is_omap34xx())
>> - ? ? ? ? ? ? ? ? ? ? omap_serial_fill_default_pads(&bdata);
>> + ? ? ? ? ? ? if (omap_serial_fill_default_pads(&bdata, uart))
>> + ? ? ? ? ? ? ? ? ? ? continue;
>>
>> ? ? ? ? ? ? ? if (!info)
>> ? ? ? ? ? ? ? ? ? ? ? omap_serial_init_port(&bdata, NULL);
>
> Can't the omap_serial_board_init() now be just be omap_serial_init(void)
> as it's not used anywhere else?

Yes sure we can remove that.

>
> Anyways, this is getting too complex for the -rc series as at least 2430sdp
> is using alternative pins for the first uart. Let's patch to remove just
> the uart4 entry for 3630 for the -rc and then we can properly fix this
> for the next merge window.

Okay. in that case the earlier patch [1] should be fine to solve the
gpmc issue observed
and ehci issue on beagle-xm.

--
Thanks,
Govindraj.R

[1]:
http://lists.infradead.org/pipermail/linux-arm-kernel/2012-March/090961.html

[PATCH 2/2] OMAP2+: UART: Add mechanism to probe uart pins and configure rx wakeup

[Tony Lindgren]

* Raja, Govindraj <govindraj.raja@ti.com> [120417 05:51]:
> On Tue, Apr 17, 2012 at 7:11 AM, Tony Lindgren <tony@atomide.com> wrote:
> > Hi,
> >
> > Few more comments below.
> >
> > * Raja, Govindraj <govindraj.raja@ti.com> [120411 04:53]:
> > ...
> >
> >> +static int ?__init omap_serial_fill_default_pads(struct omap_board_data *bdata,
> >> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? struct omap_uart_state *uart)
> >> +{
> >> + ? ? struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
> >> + ? ? struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
> >> + ? ? char *rx_fmt, *tx_fmt;
> >> + ? ? int uart_nr = bdata->id + 1;
> >> +
> >> + ? ? if (bdata->id != 2) {
> >> + ? ? ? ? ? ? rx_fmt = "uart%d_rx.uart%d_rx";
> >> + ? ? ? ? ? ? tx_fmt = "uart%d_tx.uart%d_tx";
> >> + ? ? } else {
> >> + ? ? ? ? ? ? rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
> >> + ? ? ? ? ? ? tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
> >> + ? ? }
> >> +
> >> + ? ? snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
> >> + ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
> >> + ? ? snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
> >> + ? ? ? ? ? ? ? ? ? ? uart_nr, uart_nr);
> >
> > This naming won't work for the fourth port on 3630 as there are no "uart4_rx"
> > or "uart4_tx" mux entries, they are "gpmc_wait2.uart4_tx" and
> > "gpmc_wait3.uart4_tx".
> 
> But uart4 is unused on 3630 boards and boards trying to use them
> should configure them from board file.
> (I thought we agreed on this approach where only if uarts are
> available in mux mode0 those ports will be dynamically muxed for wakeup
> others should use omap_serial_init_port)
 
Right, but you're still trying to do mux_get_by_name on it to check
the pads, which will produce a warning on 3630.

> >> @@ -289,8 +354,8 @@ void __init omap_serial_board_init(struct
> >> omap_uart_port_info *info)
> >> ? ? ? ? ? ? ? bdata.pads = NULL;
> >> ? ? ? ? ? ? ? bdata.pads_cnt = 0;
> >>
> >> - ? ? ? ? ? ? if (cpu_is_omap44xx() || cpu_is_omap34xx())
> >> - ? ? ? ? ? ? ? ? ? ? omap_serial_fill_default_pads(&bdata);
> >> + ? ? ? ? ? ? if (omap_serial_fill_default_pads(&bdata, uart))
> >> + ? ? ? ? ? ? ? ? ? ? continue;
> >>
> >> ? ? ? ? ? ? ? if (!info)
> >> ? ? ? ? ? ? ? ? ? ? ? omap_serial_init_port(&bdata, NULL);
> >
> > Can't the omap_serial_board_init() now be just be omap_serial_init(void)
> > as it's not used anywhere else?
> 
> Yes sure we can remove that.

OK 

> > Anyways, this is getting too complex for the -rc series as at least 2430sdp
> > is using alternative pins for the first uart. Let's patch to remove just
> > the uart4 entry for 3630 for the -rc and then we can properly fix this
> > for the next merge window.
> 
> Okay. in that case the earlier patch [1] should be fine to solve the
> gpmc issue observed and ehci issue on beagle-xm.

I'll just use your first patch to remove _all_ the muxing for omap_serial_init().
That's really the only safe thing we can do for the -rc cycle.

This means we rely on bootloader settings for console muxing and wake-up
bits, but that's just what we need to live with until next merge window.

And for the next merge window, I think we should only automatically enable
the wake-up event bits if the port is in serial mode, and not do any other
muxing. Something like:

void __init omap_serial_init(void)
{
        struct omap_uart_state *uart;
        struct omap_board_data bdata;

        list_for_each_entry(uart, &uart_list, node) {
                bdata.id = uart->num;
                bdata.flags = 0;
                bdata.pads = NULL;
                bdata.pads_cnt = 0;
                omap_serial_check_wakeup(&bdata);
                omap_serial_init_port(&bdata, NULL);
        }

        omap_serial_board_init(NULL);
}

Where omap_serial_check_wakeup() just enables the wake-up if the
port is already muxed to uart mode. So it turns out we can't bail
out for unmuxed uarts because some boards use alternative pads like
2430sdp does for the first uart.

Regards,

Tony