Hi Weiyi,

On 15/5/20 5:35, Weiyi Lu wrote:

On Mon, 2020-05-11 at 14:02 +0800, Weiyi Lu wrote:

quoted

On Wed, 2020-05-06 at 23:01 +0200, Enric Balletbo i Serra wrote:

quoted

Hi Weiyi,

Thank you for your patch.

On 6/5/20 10:15, Weiyi Lu wrote:

quoted

Try to stop extending the clk_id or clk_names if there are
more and more new BASIC clocks. To get its own clocks by the
basic_clk_name of each power domain.
And then use basic_clk_name strings for all compatibles, instead of
mixing clk_id and clk_name.

Signed-off-by: Weiyi Lu <redacted>
Reviewed-by: Nicolas Boichat <redacted>
---
 drivers/soc/mediatek/mtk-scpsys.c | 134 ++++++++++++--------------------------
 1 file changed, 41 insertions(+), 93 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index f669d37..c9c3cf7 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c

@@ -78,34 +78,6 @@
 #define PWR_STATUS_HIF1			BIT(26)	/* MT7622 */
 #define PWR_STATUS_WB			BIT(27)	/* MT7622 */
 
-enum clk_id {
-	CLK_NONE,
-	CLK_MM,
-	CLK_MFG,
-	CLK_VENC,
-	CLK_VENC_LT,
-	CLK_ETHIF,
-	CLK_VDEC,
-	CLK_HIFSEL,
-	CLK_JPGDEC,
-	CLK_AUDIO,
-	CLK_MAX,
-};
-
-static const char * const clk_names[] = {
-	NULL,
-	"mm",
-	"mfg",
-	"venc",
-	"venc_lt",
-	"ethif",
-	"vdec",
-	"hif_sel",
-	"jpgdec",
-	"audio",
-	NULL,
-};
-
 #define MAX_CLKS	3
 
 /**

@@ -116,7 +88,7 @@ enum clk_id {
  * @sram_pdn_bits: The mask for sram power control bits.
  * @sram_pdn_ack_bits: The mask for sram power control acked bits.
  * @bus_prot_mask: The mask for single step bus protection.
- * @clk_id: The basic clocks required by this power domain.
+ * @basic_clk_name: The basic clocks required by this power domain.
  * @caps: The flag for active wake-up action.
  */
 struct scp_domain_data {

@@ -126,7 +98,7 @@ struct scp_domain_data {
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
-	enum clk_id clk_id[MAX_CLKS];
+	const char *basic_clk_name[MAX_CLKS];

I only reviewed v13, so sorry if this was already discussed. I am wondering if
would be better take advantage of the devm_clk_bulk_get() function instead of
kind of reimplementing the same, something like this

	const struct clk_bulk_data *basic_clocks;

I thought it should be const struct clk_bulk_data
basic_clocks[MAX_CLKS]; instead of const struct clk_bulk_data
*basic_clocks; in struct scp_domain_data data type

quoted

quoted

 	u8 caps;
 };
 

@@ -411,12 +383,19 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	return ret;
 }
 
-static void init_clks(struct platform_device *pdev, struct clk **clk)
+static int init_basic_clks(struct platform_device *pdev, struct clk **clk,
+			const char * const *name)
 {
 	int i;
 
-	for (i = CLK_NONE + 1; i < CLK_MAX; i++)
-		clk[i] = devm_clk_get(&pdev->dev, clk_names[i]);
+	for (i = 0; i < MAX_CLKS && name[i]; i++) {
+		clk[i] = devm_clk_get(&pdev->dev, name[i]);
+
+		if (IS_ERR(clk[i]))
+			return PTR_ERR(clk[i]);
+	}

You will be able to remove this function, see below ...

quoted

+
+	return 0;
 }
 
 static struct scp *init_scp(struct platform_device *pdev,

@@ -426,9 +405,8 @@ static struct scp *init_scp(struct platform_device *pdev,
 {
 	struct genpd_onecell_data *pd_data;
 	struct resource *res;
-	int i, j;
+	int i, ret;
 	struct scp *scp;
-	struct clk *clk[CLK_MAX];
 
 	scp = devm_kzalloc(&pdev->dev, sizeof(*scp), GFP_KERNEL);
 	if (!scp)

@@ -481,8 +459,6 @@ static struct scp *init_scp(struct platform_device *pdev,
 
 	pd_data->num_domains = num;
 
-	init_clks(pdev, clk);
-
 	for (i = 0; i < num; i++) {
 		struct scp_domain *scpd = &scp->domains[i];
 		struct generic_pm_domain *genpd = &scpd->genpd;

@@ -493,17 +469,9 @@ static struct scp *init_scp(struct platform_device *pdev,
 
 		scpd->data = data;
 
-		for (j = 0; j < MAX_CLKS && data->clk_id[j]; j++) {
-			struct clk *c = clk[data->clk_id[j]];
-
-			if (IS_ERR(c)) {
-				dev_err(&pdev->dev, "%s: clk unavailable\n",
-					data->name);
-				return ERR_CAST(c);
-			}
-
-			scpd->clk[j] = c;
-		}
+		ret = init_basic_clks(pdev, scpd->clk, data->basic_clk_name);
+		if (ret)
+			return ERR_PTR(ret);

Just call:

	ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(basic_clocks),
				data->basic_clocks);
	if (ret)
		return ERR_PTR(ret);

quoted

 
 		genpd->name = data->name;
 		genpd->power_off = scpsys_power_off;

@@ -560,7 +528,6 @@ static void mtk_register_power_domains(struct platform_device *pdev,
 		.ctl_offs = SPM_CONN_PWR_CON,
 		.bus_prot_mask = MT2701_TOP_AXI_PROT_EN_CONN_M |
 				 MT2701_TOP_AXI_PROT_EN_CONN_S,
-		.clk_id = {CLK_NONE},
 		.caps = MTK_SCPD_ACTIVE_WAKEUP,
 	},
 	[MT2701_POWER_DOMAIN_DISP] = {

@@ -568,7 +535,7 @@ static void mtk_register_power_domains(struct platform_device *pdev,
 		.sta_mask = PWR_STATUS_DISP,
 		.ctl_offs = SPM_DIS_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
-		.clk_id = {CLK_MM},
+		.basic_clk_name = {"mm"},

		.basic_clocks[] = {
			{ .id = "mm" },
		};

Those basic clocks without given a name (name: null) would get incorrect
clock via clk_bulk_get(...) due to 

/**
 * of_parse_clkspec() - Parse a DT clock specifier for a given device
node
 * @np: device node to parse clock specifier from
 * @index: index of phandle to parse clock out of. If index < 0, @name
is used
 * @name: clock name to find and parse. If name is NULL, the index is
used

And the index is 0 here in this callstack

I guess something need to be improved before we use the clk_bulk_ APIs.

Hi Enric,

According to the result above, is it necessary to change the APIs or
maybe I should send the next version v15 first to fix other problems you
mentioned? Many thanks.

It is fine to send a next version without changing the APIs, it depends on the
extra work if you are fine with the change. To be honest I didn't see the
problem above but I think can be fixed.

Cheers,
 Enric

quoted

quoted

quoted

 		.bus_prot_mask = MT2701_TOP_AXI_PROT_EN_MM_M0,
 		.caps = MTK_SCPD_ACTIVE_WAKEUP,
 	},

@@ -578,7 +545,7 @@ static void mtk_register_power_domains(struct platform_device *pdev,
 		.ctl_offs = SPM_MFG_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(12, 12),
-		.clk_id = {CLK_MFG},
+		.basic_clk_name = {"mfg"},

		.basic_clocks[] = {
			{ .id = "mfg" },
		};

quoted

 		.caps = MTK_SCPD_ACTIVE_WAKEUP,
 	},
 	[MT2701_POWER_DOMAIN_VDEC] = {

@@ -587,7 +554,7 @@ static void mtk_register_power_domains(struct platform_device *pdev,
 		.ctl_offs = SPM_VDE_PWR_CON,
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(12, 12),
-		.clk_id = {CLK_MM},
+		.basic_clk_name = {"mm"},

...

[snip]

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