Linus Walleij wrote at Friday, September 16, 2011 6:14 AM:
> This adds a driver for the U300 pinmux portions of the system
> controller "SYSCON". It also serves as an example of how to use
> the pinmux subsystem. This driver also houses the platform data
> for the only supported platform.
...
> diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
...
> +/* Pinmux settings */
> +static struct pinmux_map u300_pinmux_map[] = {
> + /* anonymous maps for chip power and EMIFs */
> + PINMUX_MAP_PRIMARY_SYS_HOG("POWER", "power"),
> + PINMUX_MAP_PRIMARY_SYS_HOG("EMIF0", "emif0"),
> + PINMUX_MAP_PRIMARY_SYS_HOG("EMIF1", "emif1"),
> + /* per-device maps for MMC/SD, SPI and UART */
> + PINMUX_MAP_PRIMARY("MMCSD", "mmc0", "mmci"),
> + PINMUX_MAP_PRIMARY("SPI", "spi0", "pl022"),
> + PINMUX_MAP_PRIMARY("UART0", "uart0", "uart0"),
> +};
> +
> +struct u300_mux_hog {
> + const char *name;
> + struct device *dev;
> + struct pinmux *pmx;
> +};
> +
> +static struct u300_mux_hog u300_mux_hogs[] = {
> + {
> + .name = "uart0",
> + .dev = &uart0_device.dev,
> + },
> + {
> + .name = "spi0",
> + .dev = &pl022_device.dev,
> + },
> + {
> + .name = "mmc0",
> + .dev = &mmcsd_device.dev,
> + },
> +};
> +
> +static int __init u300_pinmux_fetch(void)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(u300_mux_hogs); i++) {
> + struct pinmux *pmx;
> + int ret;
> +
> + pmx = pinmux_get(u300_mux_hogs[i].dev, NULL);
> + if (IS_ERR(pmx)) {
> + pr_err("u300: could not get pinmux hog %s\n",
> + u300_mux_hogs[i].name);
> + continue;
> + }
> + ret = pinmux_enable(pmx);
> + if (ret) {
> + pr_err("u300: could enable pinmux hog %s\n",
> + u300_mux_hogs[i].name);
> + continue;
> + }
> + u300_mux_hogs[i].pmx = pmx;
> + }
> + return 0;
> +}
> +subsys_initcall(u300_pinmux_fetch);
Why not just have the pinmux core support hogging on non-"system" mapping
entries; then everything I quoted above except u300_pinmux_map[] could
be deleted, and the "hog" flag set on the last 3 u300_pinmux_map[] entries.
--
nvpublic
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