[PATCH] ARM: mxs/mx28evk: add flexcan devices
Sascha Hauer
s.hauer at pengutronix.de
Wed Mar 2 06:11:48 EST 2011
Hi Shawn,
On Wed, Mar 02, 2011 at 06:54:44PM +0800, Shawn Guo wrote:
> Signed-off-by: Shawn Guo <shawn.guo at freescale.com>
> ---
> arch/arm/mach-mxs/Kconfig | 1 +
> arch/arm/mach-mxs/mach-mx28evk.c | 37 +++++++++++++++++++++++++++++++++++++
> 2 files changed, 38 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-mxs/Kconfig b/arch/arm/mach-mxs/Kconfig
> index 55bf075..9a1f2cb 100644
> --- a/arch/arm/mach-mxs/Kconfig
> +++ b/arch/arm/mach-mxs/Kconfig
> @@ -31,6 +31,7 @@ config MACH_MX28EVK
> select MXS_HAVE_AMBA_DUART
> select MXS_HAVE_PLATFORM_AUART
> select MXS_HAVE_PLATFORM_FEC
> + select MXS_HAVE_PLATFORM_FLEXCAN
> select MXS_OCOTP
> default y
> help
> diff --git a/arch/arm/mach-mxs/mach-mx28evk.c b/arch/arm/mach-mxs/mach-mx28evk.c
> index 1f0b708..3cefb73 100644
> --- a/arch/arm/mach-mxs/mach-mx28evk.c
> +++ b/arch/arm/mach-mxs/mach-mx28evk.c
> @@ -28,6 +28,7 @@
> #include "devices-mx28.h"
> #include "gpio.h"
>
> +#define MX28EVK_FLEXCAN_SWITCH MXS_GPIO_NR(2, 13)
> #define MX28EVK_FEC_PHY_POWER MXS_GPIO_NR(2, 15)
> #define MX28EVK_FEC_PHY_RESET MXS_GPIO_NR(4, 13)
>
> @@ -95,6 +96,15 @@ static const iomux_cfg_t mx28evk_pads[] __initconst = {
> /* phy reset line */
> MX28_PAD_ENET0_RX_CLK__GPIO_4_13 |
> (MXS_PAD_4MA | MXS_PAD_3V3 | MXS_PAD_NOPULL),
> +
> + /* flexcan0 */
> + MX28_PAD_GPMI_RDY2__CAN0_TX,
> + MX28_PAD_GPMI_RDY3__CAN0_RX,
> + /* flexcan1 */
> + MX28_PAD_GPMI_CE2N__CAN1_TX,
> + MX28_PAD_GPMI_CE3N__CAN1_RX,
> + /* transceiver power control */
> + MX28_PAD_SSP1_CMD__GPIO_2_13,
> };
>
> /* fec */
> @@ -178,8 +188,28 @@ error:
> return -ETIMEDOUT;
> }
>
> +/* flexcan */
> +static void mx28evk_flexcan_switch(int enable)
> +{
> + static int count;
> +
> + if (enable) {
> + if (!count++)
> + gpio_set_value(MX28EVK_FLEXCAN_SWITCH, 1);
> + } else {
> + if (!--count)
> + gpio_set_value(MX28EVK_FLEXCAN_SWITCH, 0);
> + }
> +}
Why this count variable? It shouldn't hurt to call gpio_set_value
multiple times.
Sascha
> +
> +static const struct flexcan_platform_data mx28evk_flexcan_pdata __initconst = {
> + .transceiver_switch = mx28evk_flexcan_switch,
> +};
> +
> static void __init mx28evk_init(void)
> {
> + int ret;
> +
> mxs_iomux_setup_multiple_pads(mx28evk_pads, ARRAY_SIZE(mx28evk_pads));
>
> mx28_add_duart();
> @@ -192,6 +222,13 @@ static void __init mx28evk_init(void)
> mx28evk_fec_reset();
> mx28_add_fec(0, &mx28_fec_pdata[0]);
> mx28_add_fec(1, &mx28_fec_pdata[1]);
> +
> + ret = gpio_request_one(MX28EVK_FLEXCAN_SWITCH, GPIOF_DIR_OUT,
> + "flexcan-switch");
> + if (ret)
> + pr_warn("failed to request gpio flexcan-switch: %d\n", ret);
> + mx28_add_flexcan(0, &mx28evk_flexcan_pdata);
> + mx28_add_flexcan(1, &mx28evk_flexcan_pdata);
> }
>
> static void __init mx28evk_timer_init(void)
> --
> 1.7.1
>
>
>
--
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