[PATCH v3 1/5] phy: Add driver for Exynos MIPI CSIS/DSIM DPHYs
Hui Wang
jason77.wang at gmail.com
Fri Jun 28 18:17:28 EST 2013
On 06/26/2013 11:02 PM, Sylwester Nawrocki wrote:
> Add a PHY provider driver for the Samsung S5P/Exynos SoC MIPI CSI-2
> receiver and MIPI DSI transmitter DPHYs.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
> ---
> Changes since v2:
> - adapted to the generic PHY API v9: use phy_set/get_drvdata(),
> - fixed of_xlate callback to return ERR_PTR() instead of NULL,
> - namespace cleanup, put "GPL v2" as MODULE_LICENSE, removed pr_debug,
> - removed phy id check in __set_phy_state().
> ---
[...]
> +
> + if (IS_EXYNOS_MIPI_DSIM_PHY_ID(id))
> + reset = EXYNOS_MIPI_PHY_MRESETN;
> + else
> + reset = EXYNOS_MIPI_PHY_SRESETN;
> +
> + spin_lock_irqsave(&state->slock, flags);
Sorry for one stupid question here, why do you use spin_lock_irqsave()
rather than spin_lock(),
I don't see the irq handler will use this spinlock anywhere in this c file.
Regards,
Hui.
> + reg = readl(addr);
> + if (on)
> + reg |= reset;
> + else
> + reg &= ~reset;
> + writel(reg, addr);
> +
> + /* Clear ENABLE bit only if MRESETN, SRESETN bits are not set. */
> + if (on)
> + reg |= EXYNOS_MIPI_PHY_ENABLE;
> + else if (!(reg & EXYNOS_MIPI_PHY_RESET_MASK))
> + reg &= ~EXYNOS_MIPI_PHY_ENABLE;
> +
> + writel(reg, addr);
> + spin_unlock_irqrestore(&state->slock, flags);
> + return 0;
> +}
>
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