[PATCH v3 0/4] sdhci-xenon ACPI support

[PATCH v3 0/4] sdhci-xenon ACPI support

[Marcin Wojtas]

Hi,

The third version of the sdhci-xenon ACPI support
addresses a comment regarding clk_disable_unprepare
dependency on DT.

The MacchiatoBin firmware for testing can be obtained from:
https://drive.google.com/file/d/1Y8BhyaCrksQgT_GPfpqqiYHpQ41kP8Kp

Changelog:
v2->v3
  * Call clk_disable_unprepare unconditionally.
  * Add Adrian's Acked-by to all patches.

v1->v2
  * Split single commit to 4
  * Use device_match_data and dedicated ACPI ID's per controller
    variant


Marcin Wojtas (4):
  mmc: sdhci-xenon: use match data for controllers variants
  mmc: sdhci-xenon: switch to device_* API
  mmc: sdhci-xenon: use clk only with DT
  mmc: sdhci-xenon: introduce ACPI support

 drivers/mmc/host/sdhci-xenon.h     |  12 ++-
 drivers/mmc/host/sdhci-xenon-phy.c |  40 ++++----
 drivers/mmc/host/sdhci-xenon.c     | 101 +++++++++++++-------
 3 files changed, 97 insertions(+), 56 deletions(-)

-- 
2.29.0

[PATCH v3 1/4] mmc: sdhci-xenon: use match data for controllers variants

[Marcin Wojtas]

As a part of the ACPI support preparation resign from checking
compatible strings in the driver. Instead of that use a new
enum and assign the values to match data accordingly.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-xenon.h     |  8 ++++++++
 drivers/mmc/host/sdhci-xenon-phy.c |  4 +++-
 drivers/mmc/host/sdhci-xenon.c     | 10 ++++++----
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
index 593b82d7b68a..39e898605937 100644
--- a/drivers/mmc/host/sdhci-xenon.h
+++ b/drivers/mmc/host/sdhci-xenon.h
@@ -53,6 +53,13 @@
 #define XENON_CTRL_HS200			0x5
 #define XENON_CTRL_HS400			0x6
 
+enum xenon_variant {
+	XENON_A3700,
+	XENON_AP806,
+	XENON_AP807,
+	XENON_CP110
+};
+
 struct xenon_priv {
 	unsigned char	tuning_count;
 	/* idx of SDHC */
@@ -90,6 +97,7 @@ struct xenon_priv {
 	void		*phy_params;
 	struct xenon_emmc_phy_regs *emmc_phy_regs;
 	bool restore_needed;
+	enum xenon_variant hw_version;
 };
 
 int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios);
diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
index 03ce57ef4585..c33e0cddc81a 100644
--- a/drivers/mmc/host/sdhci-xenon-phy.c
+++ b/drivers/mmc/host/sdhci-xenon-phy.c
@@ -651,11 +651,13 @@ static int get_dt_pad_ctrl_data(struct sdhci_host *host,
 				struct device_node *np,
 				struct xenon_emmc_phy_params *params)
 {
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	int ret = 0;
 	const char *name;
 	struct resource iomem;
 
-	if (of_device_is_compatible(np, "marvell,armada-3700-sdhci"))
+	if (priv->hw_version == XENON_A3700)
 		params->pad_ctrl.set_soc_pad = armada_3700_soc_pad_voltage_set;
 	else
 		return 0;
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 24c978de2a3f..1e7ce9b1a143 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -418,7 +418,7 @@ static int xenon_probe_dt(struct platform_device *pdev)
 	u32 tuning_count;
 
 	/* Disable HS200 on Armada AP806 */
-	if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci"))
+	if (priv->hw_version == XENON_AP806)
 		host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
 
 	sdhc_id = 0x0;
@@ -495,6 +495,8 @@ static int xenon_probe(struct platform_device *pdev)
 	pltfm_host = sdhci_priv(host);
 	priv = sdhci_pltfm_priv(pltfm_host);
 
+	priv->hw_version = (unsigned long)device_get_match_data(&pdev->dev);
+
 	/*
 	 * Link Xenon specific mmc_host_ops function,
 	 * to replace standard ones in sdhci_ops.
@@ -667,9 +669,9 @@ static const struct dev_pm_ops sdhci_xenon_dev_pm_ops = {
 };
 
 static const struct of_device_id sdhci_xenon_dt_ids[] = {
-	{ .compatible = "marvell,armada-ap806-sdhci",},
-	{ .compatible = "marvell,armada-cp110-sdhci",},
-	{ .compatible = "marvell,armada-3700-sdhci",},
+	{ .compatible = "marvell,armada-ap806-sdhci", .data = (void *)XENON_AP806},
+	{ .compatible = "marvell,armada-cp110-sdhci", .data =  (void *)XENON_CP110},
+	{ .compatible = "marvell,armada-3700-sdhci", .data =  (void *)XENON_A3700},
 	{}
 };
 MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
-- 
2.29.0

[PATCH v3 2/4] mmc: sdhci-xenon: switch to device_* API

[Marcin Wojtas]

In order to support both ACPI and DT, modify the driver
to use device_* routines for obtaining the properties
values.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-xenon.h     |  4 +--
 drivers/mmc/host/sdhci-xenon-phy.c | 36 +++++++++++---------
 drivers/mmc/host/sdhci-xenon.c     | 18 +++++-----
 3 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
index 39e898605937..3e9c6c908a79 100644
--- a/drivers/mmc/host/sdhci-xenon.h
+++ b/drivers/mmc/host/sdhci-xenon.h
@@ -101,8 +101,8 @@ struct xenon_priv {
 };
 
 int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios);
-int xenon_phy_parse_dt(struct device_node *np,
-		       struct sdhci_host *host);
+int xenon_phy_parse_params(struct device *dev,
+			   struct sdhci_host *host);
 void xenon_soc_pad_ctrl(struct sdhci_host *host,
 			unsigned char signal_voltage);
 #endif
diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
index c33e0cddc81a..8cf3a375de65 100644
--- a/drivers/mmc/host/sdhci-xenon-phy.c
+++ b/drivers/mmc/host/sdhci-xenon-phy.c
@@ -691,35 +691,37 @@ static int get_dt_pad_ctrl_data(struct sdhci_host *host,
 	return ret;
 }
 
-static int xenon_emmc_phy_parse_param_dt(struct sdhci_host *host,
-					 struct device_node *np,
-					 struct xenon_emmc_phy_params *params)
+static int xenon_emmc_phy_parse_params(struct sdhci_host *host,
+				       struct device *dev,
+				       struct xenon_emmc_phy_params *params)
 {
 	u32 value;
 
 	params->slow_mode = false;
-	if (of_property_read_bool(np, "marvell,xenon-phy-slow-mode"))
+	if (device_property_read_bool(dev, "marvell,xenon-phy-slow-mode"))
 		params->slow_mode = true;
 
 	params->znr = XENON_ZNR_DEF_VALUE;
-	if (!of_property_read_u32(np, "marvell,xenon-phy-znr", &value))
+	if (!device_property_read_u32(dev, "marvell,xenon-phy-znr", &value))
 		params->znr = value & XENON_ZNR_MASK;
 
 	params->zpr = XENON_ZPR_DEF_VALUE;
-	if (!of_property_read_u32(np, "marvell,xenon-phy-zpr", &value))
+	if (!device_property_read_u32(dev, "marvell,xenon-phy-zpr", &value))
 		params->zpr = value & XENON_ZPR_MASK;
 
 	params->nr_tun_times = XENON_TUN_CONSECUTIVE_TIMES;
-	if (!of_property_read_u32(np, "marvell,xenon-phy-nr-success-tun",
-				  &value))
+	if (!device_property_read_u32(dev, "marvell,xenon-phy-nr-success-tun",
+				      &value))
 		params->nr_tun_times = value & XENON_TUN_CONSECUTIVE_TIMES_MASK;
 
 	params->tun_step_divider = XENON_TUNING_STEP_DIVIDER;
-	if (!of_property_read_u32(np, "marvell,xenon-phy-tun-step-divider",
-				  &value))
+	if (!device_property_read_u32(dev, "marvell,xenon-phy-tun-step-divider",
+				      &value))
 		params->tun_step_divider = value & 0xFF;
 
-	return get_dt_pad_ctrl_data(host, np, params);
+	if (dev->of_node)
+		return get_dt_pad_ctrl_data(host, dev->of_node, params);
+	return 0;
 }
 
 /* Set SoC PHY Voltage PAD */
@@ -813,7 +815,7 @@ int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios)
 	return ret;
 }
 
-static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
+static int xenon_add_phy(struct device *dev, struct sdhci_host *host,
 			 const char *phy_name)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -832,15 +834,15 @@ static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
 	if (ret)
 		return ret;
 
-	return xenon_emmc_phy_parse_param_dt(host, np, priv->phy_params);
+	return xenon_emmc_phy_parse_params(host, dev, priv->phy_params);
 }
 
-int xenon_phy_parse_dt(struct device_node *np, struct sdhci_host *host)
+int xenon_phy_parse_params(struct device *dev, struct sdhci_host *host)
 {
 	const char *phy_type = NULL;
 
-	if (!of_property_read_string(np, "marvell,xenon-phy-type", &phy_type))
-		return xenon_add_phy(np, host, phy_type);
+	if (!device_property_read_string(dev, "marvell,xenon-phy-type", &phy_type))
+		return xenon_add_phy(dev, host, phy_type);
 
-	return xenon_add_phy(np, host, "emmc 5.1 phy");
+	return xenon_add_phy(dev, host, "emmc 5.1 phy");
 }
diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index 1e7ce9b1a143..bfc76b0e3eaa 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -407,9 +407,9 @@ static void xenon_replace_mmc_host_ops(struct sdhci_host *host)
  *	    Refer to XENON_SYS_CFG_INFO register
  * tun-count: the interval between re-tuning
  */
-static int xenon_probe_dt(struct platform_device *pdev)
+static int xenon_probe_params(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct mmc_host *mmc = host->mmc;
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -422,7 +422,7 @@ static int xenon_probe_dt(struct platform_device *pdev)
 		host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
 
 	sdhc_id = 0x0;
-	if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) {
+	if (!device_property_read_u32(dev, "marvell,xenon-sdhc-id", &sdhc_id)) {
 		nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO);
 		nr_sdhc &= XENON_NR_SUPPORTED_SLOT_MASK;
 		if (unlikely(sdhc_id > nr_sdhc)) {
@@ -434,8 +434,8 @@ static int xenon_probe_dt(struct platform_device *pdev)
 	priv->sdhc_id = sdhc_id;
 
 	tuning_count = XENON_DEF_TUNING_COUNT;
-	if (!of_property_read_u32(np, "marvell,xenon-tun-count",
-				  &tuning_count)) {
+	if (!device_property_read_u32(dev, "marvell,xenon-tun-count",
+				      &tuning_count)) {
 		if (unlikely(tuning_count >= XENON_TMR_RETUN_NO_PRESENT)) {
 			dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n",
 				XENON_DEF_TUNING_COUNT);
@@ -444,7 +444,7 @@ static int xenon_probe_dt(struct platform_device *pdev)
 	}
 	priv->tuning_count = tuning_count;
 
-	return xenon_phy_parse_dt(np, host);
+	return xenon_phy_parse_params(dev, host);
 }
 
 static int xenon_sdhc_prepare(struct sdhci_host *host)
@@ -528,12 +528,12 @@ static int xenon_probe(struct platform_device *pdev)
 	if (err)
 		goto err_clk_axi;
 
-	sdhci_get_of_property(pdev);
+	sdhci_get_property(pdev);
 
 	xenon_set_acg(host, false);
 
-	/* Xenon specific dt parse */
-	err = xenon_probe_dt(pdev);
+	/* Xenon specific parameters parse */
+	err = xenon_probe_params(pdev);
 	if (err)
 		goto err_clk_axi;
 
-- 
2.29.0

[PATCH v3 3/4] mmc: sdhci-xenon: use clk only with DT

[Marcin Wojtas]

As a preparation for supporting ACPI, modify the driver
to use the clk framework only when booting with DT -
otherwise rely on the configuration done by firmware.
For that purpose introduce also a custom SDHCI get_max_clock
callback.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-xenon.c | 61 ++++++++++++--------
 1 file changed, 38 insertions(+), 23 deletions(-)

diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index bfc76b0e3eaa..cc0fcc646b0e 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -247,6 +247,16 @@ static void xenon_voltage_switch(struct sdhci_host *host)
 	sdhci_readw(host, SDHCI_HOST_CONTROL2);
 }
 
+static unsigned int xenon_get_max_clock(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+	if (pltfm_host->clk)
+		return sdhci_pltfm_clk_get_max_clock(host);
+	else
+		return pltfm_host->clock;
+}
+
 static const struct sdhci_ops sdhci_xenon_ops = {
 	.voltage_switch		= xenon_voltage_switch,
 	.set_clock		= sdhci_set_clock,
@@ -254,7 +264,7 @@ static const struct sdhci_ops sdhci_xenon_ops = {
 	.set_bus_width		= sdhci_set_bus_width,
 	.reset			= xenon_reset,
 	.set_uhs_signaling	= xenon_set_uhs_signaling,
-	.get_max_clock		= sdhci_pltfm_clk_get_max_clock,
+	.get_max_clock		= xenon_get_max_clock,
 };
 
 static const struct sdhci_pltfm_data sdhci_xenon_pdata = {
@@ -483,6 +493,7 @@ static void xenon_sdhc_unprepare(struct sdhci_host *host)
 static int xenon_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
+	struct device *dev = &pdev->dev;
 	struct sdhci_host *host;
 	struct xenon_priv *priv;
 	int err;
@@ -503,25 +514,27 @@ static int xenon_probe(struct platform_device *pdev)
 	 */
 	xenon_replace_mmc_host_ops(host);
 
-	pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
-	if (IS_ERR(pltfm_host->clk)) {
-		err = PTR_ERR(pltfm_host->clk);
-		dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
-		goto free_pltfm;
-	}
-	err = clk_prepare_enable(pltfm_host->clk);
-	if (err)
-		goto free_pltfm;
-
-	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
-	if (IS_ERR(priv->axi_clk)) {
-		err = PTR_ERR(priv->axi_clk);
-		if (err == -EPROBE_DEFER)
-			goto err_clk;
-	} else {
-		err = clk_prepare_enable(priv->axi_clk);
+	if (dev->of_node) {
+		pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
+		if (IS_ERR(pltfm_host->clk)) {
+			err = PTR_ERR(pltfm_host->clk);
+			dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
+			goto free_pltfm;
+		}
+		err = clk_prepare_enable(pltfm_host->clk);
 		if (err)
-			goto err_clk;
+			goto free_pltfm;
+
+		priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
+		if (IS_ERR(priv->axi_clk)) {
+			err = PTR_ERR(priv->axi_clk);
+			if (err == -EPROBE_DEFER)
+				goto err_clk;
+		} else {
+			err = clk_prepare_enable(priv->axi_clk);
+			if (err)
+				goto err_clk;
+		}
 	}
 
 	err = mmc_of_parse(host->mmc);
@@ -637,10 +650,12 @@ static int xenon_runtime_resume(struct device *dev)
 	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	int ret;
 
-	ret = clk_prepare_enable(pltfm_host->clk);
-	if (ret) {
-		dev_err(dev, "can't enable mainck\n");
-		return ret;
+	if (dev->of_node) {
+		ret = clk_prepare_enable(pltfm_host->clk);
+		if (ret) {
+			dev_err(dev, "can't enable mainck\n");
+			return ret;
+		}
 	}
 
 	if (priv->restore_needed) {
-- 
2.29.0

[PATCH v3 4/4] mmc: sdhci-xenon: introduce ACPI support

[Marcin Wojtas]

Previous patches dropped the strict dependency on the OF_*
in the sdhci-xenon driver. As a result the ACPI support
can be introduced (except for the XENON_A3700 variant)
by adding the necessary ID's in the acpi_match_table.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-xenon.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index cc0fcc646b0e..395f7c3064ce 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -11,6 +11,7 @@
  * Special thanks to Video BG4 project team.
  */
 
+#include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/ktime.h>
 #include <linux/module.h>
@@ -691,11 +692,22 @@ static const struct of_device_id sdhci_xenon_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id sdhci_xenon_acpi_ids[] = {
+	{ .id = "MRVL0002", XENON_AP806},
+	{ .id = "MRVL0003", XENON_AP807},
+	{ .id = "MRVL0004", XENON_CP110},
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, sdhci_xenon_acpi_ids);
+#endif
+
 static struct platform_driver sdhci_xenon_driver = {
 	.driver	= {
 		.name	= "xenon-sdhci",
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = sdhci_xenon_dt_ids,
+		.acpi_match_table = ACPI_PTR(sdhci_xenon_acpi_ids),
 		.pm = &sdhci_xenon_dev_pm_ops,
 	},
 	.probe	= xenon_probe,
-- 
2.29.0

Re: [PATCH v3 3/4] mmc: sdhci-xenon: use clk only with DT

[Ulf Hansson]

On Wed, 2 Dec 2020 at 19:51, Marcin Wojtas <mw@semihalf.com> wrote:
>
> As a preparation for supporting ACPI, modify the driver
> to use the clk framework only when booting with DT -
> otherwise rely on the configuration done by firmware.
> For that purpose introduce also a custom SDHCI get_max_clock
> callback.
>
> Signed-off-by: Marcin Wojtas <mw@semihalf.com>
> Acked-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  drivers/mmc/host/sdhci-xenon.c | 61 ++++++++++++--------
>  1 file changed, 38 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c

[...]

> @@ -637,10 +650,12 @@ static int xenon_runtime_resume(struct device *dev)
>         struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
>         int ret;
>
> -       ret = clk_prepare_enable(pltfm_host->clk);
> -       if (ret) {
> -               dev_err(dev, "can't enable mainck\n");
> -               return ret;
> +       if (dev->of_node) {

I didn't notice this in the earlier version, my apologies, but there
is no need for this check.

clk_prepare_enable() should cope fine with a NULL argument - and you
only reach this path, if the clock was successfully fetched during the
probe or that it was left to stay NULL for non-DT case.

> +               ret = clk_prepare_enable(pltfm_host->clk);
> +               if (ret) {
> +                       dev_err(dev, "can't enable mainck\n");
> +                       return ret;
> +               }
>         }
>
>         if (priv->restore_needed) {
> --
> 2.29.0
>

Kind regards
Uffe

Re: [PATCH v3 3/4] mmc: sdhci-xenon: use clk only with DT

[Marcin Wojtas]

pt., 4 gru 2020 o 14:51 Ulf Hansson <ulf.hansson@linaro.org> napisał(a):
>
> On Wed, 2 Dec 2020 at 19:51, Marcin Wojtas <mw@semihalf.com> wrote:
> >
> > As a preparation for supporting ACPI, modify the driver
> > to use the clk framework only when booting with DT -
> > otherwise rely on the configuration done by firmware.
> > For that purpose introduce also a custom SDHCI get_max_clock
> > callback.
> >
> > Signed-off-by: Marcin Wojtas <mw@semihalf.com>
> > Acked-by: Adrian Hunter <adrian.hunter@intel.com>
> > ---
> >  drivers/mmc/host/sdhci-xenon.c | 61 ++++++++++++--------
> >  1 file changed, 38 insertions(+), 23 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
>
> [...]
>
> > @@ -637,10 +650,12 @@ static int xenon_runtime_resume(struct device *dev)
> >         struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> >         int ret;
> >
> > -       ret = clk_prepare_enable(pltfm_host->clk);
> > -       if (ret) {
> > -               dev_err(dev, "can't enable mainck\n");
> > -               return ret;
> > +       if (dev->of_node) {
>
> I didn't notice this in the earlier version, my apologies, but there
> is no need for this check.
>
> clk_prepare_enable() should cope fine with a NULL argument - and you
> only reach this path, if the clock was successfully fetched during the
> probe or that it was left to stay NULL for non-DT case.

You are right, thanks! I applied the change and resent v4.

Best regards,
Marcin

>
> > +               ret = clk_prepare_enable(pltfm_host->clk);
> > +               if (ret) {
> > +                       dev_err(dev, "can't enable mainck\n");
> > +                       return ret;
> > +               }
> >         }
> >
> >         if (priv->restore_needed) {
> > --
> > 2.29.0
> >
>
> Kind regards
> Uffe