linux-kernel - Re: [PATCH 3/7] soc: imx: imx8m-blk-ctrl: add i.MX8MN DISP blk-ctrl

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Message-ID: <8c1d1b836d1acb94e22a355d064a6df867d1e9e2.camel@pengutronix.de>
Date:   Wed, 06 Oct 2021 09:45:43 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Adam Ford <aford173@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     aford@...conembedded.com, Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] soc: imx: imx8m-blk-ctrl: add i.MX8MN DISP blk-ctrl

Am Dienstag, dem 05.10.2021 um 19:05 -0500 schrieb Adam Ford:
> This adds the description for the i.MX8MN disp blk-ctrl.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> ---
>  drivers/soc/imx/imx8m-blk-ctrl.c | 70 ++++++++++++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
> 
> diff --git a/drivers/soc/imx/imx8m-blk-ctrl.c b/drivers/soc/imx/imx8m-blk-ctrl.c
> index e172d295c441..8fcd5ed62f50 100644
> --- a/drivers/soc/imx/imx8m-blk-ctrl.c
> +++ b/drivers/soc/imx/imx8m-blk-ctrl.c
> @@ -14,6 +14,7 @@
>  #include <linux/clk.h>
>  
>  #include <dt-bindings/power/imx8mm-power.h>
> +#include <dt-bindings/power/imx8mn-power.h>
>  
>  #define BLK_SFT_RSTN	0x0
>  #define BLK_CLK_EN	0x4
> @@ -498,6 +499,75 @@ static const struct imx8m_blk_ctrl_data imx8mm_disp_blk_ctl_dev_data = {
>  	.num_domains = ARRAY_SIZE(imx8mm_disp_blk_ctl_domain_data),
>  };
>  
> +
> +static int imx8mn_disp_power_notifier(struct notifier_block *nb,
> +				      unsigned long action, void *data)
> +{
> +	struct imx8m_blk_ctrl *bc = container_of(nb, struct imx8m_blk_ctrl,
> +						 power_nb);
> +
> +	if (action != GENPD_NOTIFY_ON && action != GENPD_NOTIFY_PRE_OFF)
> +		return NOTIFY_OK;
> +
> +	/* Enable bus clock and deassert bus reset */
> +	regmap_set_bits(bc->regmap, BLK_CLK_EN, BIT(8));
> +	regmap_set_bits(bc->regmap, BLK_SFT_RSTN, BIT(8));
> +
> +	/*
> +	 * On power up we have no software backchannel to the GPC to
> +	 * wait for the ADB handshake to happen, so we just delay for a
> +	 * bit. On power down the GPC driver waits for the handshake.
> +	 */
> +	if (action == GENPD_NOTIFY_ON)
> +		udelay(5);
> +
> +
> +	return NOTIFY_OK;
> +}
> +
> +static const struct imx8m_blk_ctrl_domain_data imx8mn_disp_blk_ctl_domain_data[] = {
> +	[IMX8MN_DISPBLK_PD_MIPI_DSI] = {
> +		.name = "dispblk-mipi-dsi",
> +		.clk_names = (const char *[]){ "dsi-pclk", "dsi-ref", },
> +		.num_clks = 2,
> +		.gpc_name = "mipi-dsi",
> +		.rst_mask = BIT(0) | BIT(1),
> +		.clk_mask = BIT(0) | BIT(1),
> +	},
> +	[IMX8MN_DISPBLK_PD_MIPI_CSI] = {
> +		.name = "dispblk-mipi-csi",
> +		.clk_names = (const char *[]){ "csi-aclk", "csi-pclk" },
> +		.num_clks = 2,
> +		.gpc_name = "mipi-csi",
> +		.rst_mask = BIT(2) | BIT(3),
> +		.clk_mask = BIT(2) | BIT(3),
> +	},
> +	[IMX8MN_DISPBLK_PD_LCDIF] = {
> +		.name = "dispblk-lcdif",
> +		.clk_names = (const char *[]){ "lcdif-axi", "lcdif-apb", "lcdif-pix", },
> +		.num_clks = 3,
> +		.gpc_name = "lcdif",
> +		.rst_mask = BIT(4) | BIT(5),
> +		.clk_mask = BIT(4) | BIT(5),
> +	},
> +	[IMX8MN_DISPBLK_PD_ISI] = {
> +		.name = "dispblk-isi",
> +		.clk_names = (const char *[]){ "disp_axi", "disp_apb", "disp_axi_root",
> +						"disp_apb_root"},
> +		.num_clks = 2,

I think those are wrong. At least the num_clks and the number of clock
names is inconsistent.

> +		.gpc_name = "isi",
> +		.rst_mask = BIT(6) | BIT(7),
> +		.clk_mask = BIT(6) | BIT(7),
> +	},
> +};
> +
> +static const struct imx8m_blk_ctrl_data imx8mn_disp_blk_ctl_dev_data = {
> +	.max_reg = 0x84,
> +	.power_notifier_fn = imx8mn_disp_power_notifier,
> +	.domains = imx8mn_disp_blk_ctl_domain_data,
> +	.num_domains = ARRAY_SIZE(imx8mn_disp_blk_ctl_domain_data),
> +};
> +
You need to hook this up in imx8m_blk_ctrl_of_match, otherwise this is
all just dead code.

Regards,
Lucas

>  static const struct of_device_id imx8m_blk_ctrl_of_match[] = {
>  	{
>  		.compatible = "fsl,imx8mm-vpu-blk-ctrl",