linux-kernel - Re: [PATCH V3 3/4] soc: imx: Add generic blk-ctl driver

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Date:   Thu, 6 May 2021 09:31:13 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        p.zabel@...gutronix.de, l.stach@...gutronix.de, krzk@...nel.org,
        agx@...xcpu.org, marex@...x.de, andrew.smirnov@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ping.bai@....com, aford173@...il.com,
        abel.vesa@....com, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V3 3/4] soc: imx: Add generic blk-ctl driver

On 06.05.21 06:15, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> The i.MX8MM introduces an IP named BLK_CTL and usually is comprised of
> some GPRs.
> 
> The GPRs has some clock bits and reset bits, but here we take it
> as virtual PDs, because of the clock and power domain A/B lock issue
> when taking it as a clock controller.
> 
> For some bits, it might be good to also make it as a reset controller,
> but to i.MX8MM, we not add that support for now.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/soc/imx/Makefile  |   2 +-
>  drivers/soc/imx/blk-ctl.c | 307 ++++++++++++++++++++++++++++++++++++++
>  drivers/soc/imx/blk-ctl.h |  77 ++++++++++
>  3 files changed, 385 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/soc/imx/blk-ctl.c
>  create mode 100644 drivers/soc/imx/blk-ctl.h
> 
> diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
> index 078dc918f4f3..d3d2b49a386c 100644
> --- a/drivers/soc/imx/Makefile
> +++ b/drivers/soc/imx/Makefile
> @@ -4,4 +4,4 @@ obj-$(CONFIG_ARCH_MXC) += soc-imx.o
>  endif
>  obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
>  obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
> -obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
> +obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o blk-ctl.o
> diff --git a/drivers/soc/imx/blk-ctl.c b/drivers/soc/imx/blk-ctl.c
> new file mode 100644
> index 000000000000..e184d862b26b
> --- /dev/null
> +++ b/drivers/soc/imx/blk-ctl.c
> @@ -0,0 +1,307 @@
[...]
> +
> +	blk_ctl->power_count--;
> +
> +	if (!blk_ctl->power_count) {
> +		ret = imx_blk_ctl_enable_hsk(blk_ctl->dev);
> +		if (ret)
> +			dev_err(blk_ctl->dev, "Hankshake failed when power off\n");

You still have a 'k' instead of a 'd' in "Handshake"!

> +	}
> +
> +hsk_fail:
> +	clk_bulk_disable_unprepare(blk_ctl->num_clks, blk_ctl->clks);
> +
> +	mutex_unlock(&blk_ctl->lock);
> +
> +	return ret;
> +}
> +
> +int imx_blk_ctl_power_on(struct generic_pm_domain *domain)
> +{
> +	struct imx_blk_ctl_domain *pd = to_imx_blk_ctl_pd(domain);
> +	struct imx_blk_ctl *blk_ctl = pd->blk_ctl;
> +	struct regmap *regmap = blk_ctl->regmap;
> +	const struct imx_blk_ctl_hw *hw = &blk_ctl->dev_data->pds[pd->id];
> +	int ret;
> +
> +	mutex_lock(&blk_ctl->lock);
> +
> +	ret = clk_bulk_prepare_enable(blk_ctl->num_clks, blk_ctl->clks);
> +	if (ret) {
> +		mutex_unlock(&blk_ctl->lock);
> +		return ret;
> +	}
> +
> +	if (!blk_ctl->power_count) {
> +		ret = imx_blk_ctl_enable_hsk(blk_ctl->dev);
> +		if (ret) {
> +			dev_err(blk_ctl->dev, "Hankshake failed when power on\n");

You still have a 'k' instead of a 'd' in "Handshake"!

> +			goto disable_clk;
> +		}
> +	}
> +
[...]