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SubjectRe: [PATCH v4 11/11] da850: pruss CAN board specific additions.
On 04/22/2011 02:08 PM, Subhasish Ghosh wrote:
> This patch adds the pruss CAN pinmux and registers the device
> with the pruss mfd driver.
>
> Signed-off-by: Subhasish Ghosh <subhasish@mistralsolutions.com>
> ---
> arch/arm/mach-davinci/board-da850-evm.c | 46 +++++++++++++++++++++++++++++++
> 1 files changed, 46 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
> index e7fdf31..e1ff18c 100644
> --- a/arch/arm/mach-davinci/board-da850-evm.c
> +++ b/arch/arm/mach-davinci/board-da850-evm.c
> @@ -48,6 +48,7 @@
>
> #define DA850_MMCSD_CD_PIN GPIO_TO_PIN(4, 0)
> #define DA850_MMCSD_WP_PIN GPIO_TO_PIN(4, 1)
> +#define DA850_PRUSS_CAN_TRX_PIN GPIO_TO_PIN(2, 0)
>
> #define DA850_MII_MDIO_CLKEN_PIN GPIO_TO_PIN(2, 6)
>
> @@ -1117,6 +1118,43 @@ static __init int da850_evm_init_cpufreq(void)
> static __init int da850_evm_init_cpufreq(void) { return 0; }
> #endif
>
> +static const short da850_evm_pruss_can_pins[] = {
> + DA850_PRUSS_PRU0_R31_0, DA850_PRUSS_PRU1_R30_15,
> + DA850_PRUSS_PRU1_R31_18, DA850_GPIO2_0,
> + -1
> +};
> +
> +static int __init da850_evm_pruss_can_setup(void)
> +{
> + int ret, val = 0;
> + void __iomem *cfg_chip3_reg;
> +
> + ret = davinci_cfg_reg_list(da850_evm_pruss_can_pins);
> + if (ret)
> + pr_warning("%s: da850_evm_pruss_can_pins mux setup "
> + "failed:%d\n", __func__, ret);
> + cfg_chip3_reg = DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP3_REG);
> + val = __raw_readl(cfg_chip3_reg);
> + val |= BIT(3);
> + __raw_writel(val, cfg_chip3_reg);
> +
> + /* value = 0 to enable the CAN transceiver */
> + ret = gpio_request_one(DA850_PRUSS_CAN_TRX_PIN,
> + GPIOF_OUT_INIT_LOW, "pruss_can_en");
> + if (ret) {
> + pr_warning("Cannot setup GPIO %d\n", DA850_PRUSS_CAN_TRX_PIN);
> + gpio_free(DA850_PRUSS_CAN_TRX_PIN);
> + }
> +
> + return ret;
> +}
> +
> +static struct da850_evm_pruss_can_data can_data = {
> + .version = 1,
> + .setup = da850_evm_pruss_can_setup,

I suggest to do the pinmux setup unconditionally before registering the
can driver. Rename setup into transceiver_switch and extend the driver
to switch on and off the transceiver. Call the transceiver switch from
open and close in the can drver.

> +};
> +
> +
> static const short da850_evm_pruss_suart_pins[] = {
> DA850_AHCLKX, DA850_ACLKX, DA850_AFSX,
> DA850_AHCLKR, DA850_ACLKR, DA850_AFSR,
> @@ -1161,6 +1199,14 @@ static struct mfd_cell cell[] = {
> .resources = da850_evm_pruss_suart_resource,
> },
> {
> + .id = 1,
> + .name = "da8xx_pruss_can",
> + .platform_data = &can_data,
> + .data_size = sizeof(can_data),
> + .num_resources = 0,
> + .resources = NULL,
> + },
> + {
> .name = NULL,
> },
> };

Marc

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