Re: [PATCH RESEND v6 4/5] spmi: pmic-arb: Make core resources acquiring a version operation

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On 26/03/2024 17:28, Abel Vesa wrote:
Rather than setting up the core, obsrv and chnls in probe by using
version specific conditionals, add a dedicated "get_core_resources"
version specific op and move the acquiring in there.

Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
---
  drivers/spmi/spmi-pmic-arb.c | 113 +++++++++++++++++++++++++++----------------
  1 file changed, 70 insertions(+), 43 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 38fed8a585fe..188252bfb95f 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -203,6 +203,7 @@ struct spmi_pmic_arb {
   */
  struct pmic_arb_ver_ops {
  	const char *ver_str;
+	int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
  	int (*init_apid)(struct spmi_pmic_arb *pmic_arb, int index);
  	int (*ppid_to_apid)(struct spmi_pmic_arb *pmic_arb, u16 ppid);
  	/* spmi commands (read_cmd, write_cmd, cmd) functionality */
@@ -956,6 +957,19 @@ static int pmic_arb_init_apid_min_max(struct spmi_pmic_arb *pmic_arb)
  	return 0;
  }
+static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
+					  void __iomem *core)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->wr_base = core;
+	pmic_arb->rd_base = core;
+
+	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
+
+	return 0;
+}
+
  static int pmic_arb_init_apid_v1(struct spmi_pmic_arb *pmic_arb, int index)
  {
  	u32 *mapping_table;
@@ -1063,6 +1077,33 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pmic_arb, u16 ppid)
  	return apid;
  }
+static int pmic_arb_get_obsrvr_chnls_v2(struct platform_device *pdev)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->rd_base = devm_platform_ioremap_resource_byname(pdev, "obsrvr");
+	if (IS_ERR(pmic_arb->rd_base))
+		return PTR_ERR(pmic_arb->rd_base);
+
+	pmic_arb->wr_base = devm_platform_ioremap_resource_byname(pdev, "chnls");
+	if (IS_ERR(pmic_arb->wr_base))
+		return PTR_ERR(pmic_arb->wr_base);
+
+	return 0;
+}
+
+static int pmic_arb_get_core_resources_v2(struct platform_device *pdev,
+					  void __iomem *core)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->core = core;
+
+	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
+
+	return pmic_arb_get_obsrvr_chnls_v2(pdev);
+}
+
  static int pmic_arb_ppid_to_apid_v2(struct spmi_pmic_arb *pmic_arb, u16 ppid)
  {
  	u16 apid_valid;
@@ -1246,6 +1287,18 @@ static int pmic_arb_offset_v5(struct spmi_pmic_arb *pmic_arb, u8 sid, u16 addr,
  	return offset;
  }
+static int pmic_arb_get_core_resources_v7(struct platform_device *pdev,
+					  void __iomem *core)
+{
+	struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
+
+	pmic_arb->core = core;
+
+	pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS_V7;
+
+	return pmic_arb_get_obsrvr_chnls_v2(pdev);
+}
+
  /*
   * Only v7 supports 2 buses. Each bus will get a different apid count, read
   * from different registers.
@@ -1469,6 +1522,7 @@ pmic_arb_apid_owner_v7(struct spmi_pmic_arb *pmic_arb, u16 n)
static const struct pmic_arb_ver_ops pmic_arb_v1 = {
  	.ver_str		= "v1",
+	.get_core_resources	= pmic_arb_get_core_resources_v1,
  	.init_apid		= pmic_arb_init_apid_v1,
  	.ppid_to_apid		= pmic_arb_ppid_to_apid_v1,
  	.non_data_cmd		= pmic_arb_non_data_cmd_v1,
@@ -1484,6 +1538,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v1 = {
static const struct pmic_arb_ver_ops pmic_arb_v2 = {
  	.ver_str		= "v2",
+	.get_core_resources	= pmic_arb_get_core_resources_v2,
  	.init_apid		= pmic_arb_init_apid_v1,
  	.ppid_to_apid		= pmic_arb_ppid_to_apid_v2,
  	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1499,6 +1554,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v2 = {
static const struct pmic_arb_ver_ops pmic_arb_v3 = {
  	.ver_str		= "v3",
+	.get_core_resources	= pmic_arb_get_core_resources_v2,
  	.init_apid		= pmic_arb_init_apid_v1,
  	.ppid_to_apid		= pmic_arb_ppid_to_apid_v2,
  	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1514,6 +1570,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v3 = {
static const struct pmic_arb_ver_ops pmic_arb_v5 = {
  	.ver_str		= "v5",
+	.get_core_resources	= pmic_arb_get_core_resources_v2,
  	.init_apid		= pmic_arb_init_apid_v5,
  	.ppid_to_apid		= pmic_arb_ppid_to_apid_v5,
  	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1529,6 +1586,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v5 = {
static const struct pmic_arb_ver_ops pmic_arb_v7 = {
  	.ver_str		= "v7",
+	.get_core_resources	= pmic_arb_get_core_resources_v7,
  	.init_apid		= pmic_arb_init_apid_v7,
  	.ppid_to_apid		= pmic_arb_ppid_to_apid_v5,
  	.non_data_cmd		= pmic_arb_non_data_cmd_v2,
@@ -1565,16 +1623,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
  	pmic_arb = spmi_controller_get_drvdata(ctrl);
  	pmic_arb->spmic = ctrl;
- /*
-	 * Please don't replace this with devm_platform_ioremap_resource() or
-	 * devm_ioremap_resource().  These both result in a call to
-	 * devm_request_mem_region() which prevents multiple mappings of this
-	 * register address range.  SoCs with PMIC arbiter v7 may define two
-	 * arbiter devices, for the two physical SPMI interfaces, which  share
-	 * some register address ranges (i.e. "core", "obsrvr", and "chnls").
-	 * Ensure that both devices probe successfully by calling devm_ioremap()
-	 * which does not result in a devm_request_mem_region() call.
-	 */

Can you explain in the commit message why you remove this comment ?

  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "core");
  	core = devm_ioremap(&ctrl->dev, res->start, resource_size(res));
  	if (IS_ERR(core))
@@ -1584,44 +1632,23 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
hw_ver = readl_relaxed(core + PMIC_ARB_VERSION); - if (hw_ver < PMIC_ARB_VERSION_V2_MIN) {
+	if (hw_ver < PMIC_ARB_VERSION_V2_MIN)
  		pmic_arb->ver_ops = &pmic_arb_v1;
-		pmic_arb->wr_base = core;
-		pmic_arb->rd_base = core;
-	} else {
-		pmic_arb->core = core;
-
-		if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
-			pmic_arb->ver_ops = &pmic_arb_v2;
-		else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
-			pmic_arb->ver_ops = &pmic_arb_v3;
-		else if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
-			pmic_arb->ver_ops = &pmic_arb_v5;
-		else
-			pmic_arb->ver_ops = &pmic_arb_v7;
-
-		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
-						   "obsrvr");
-		pmic_arb->rd_base = devm_ioremap(&ctrl->dev, res->start,
-						 resource_size(res));
-		if (IS_ERR(pmic_arb->rd_base))
-			return PTR_ERR(pmic_arb->rd_base);
-
-		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
-						   "chnls");
-		pmic_arb->wr_base = devm_ioremap(&ctrl->dev, res->start,
-						 resource_size(res));
-		if (IS_ERR(pmic_arb->wr_base))
-			return PTR_ERR(pmic_arb->wr_base);
-	}
+	else if (hw_ver < PMIC_ARB_VERSION_V3_MIN)
+		pmic_arb->ver_ops = &pmic_arb_v2;
+	else if (hw_ver < PMIC_ARB_VERSION_V5_MIN)
+		pmic_arb->ver_ops = &pmic_arb_v3;
+	else if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
+		pmic_arb->ver_ops = &pmic_arb_v5;
+	else
+		pmic_arb->ver_ops = &pmic_arb_v7;
dev_info(&ctrl->dev, "PMIC arbiter version %s (0x%x)\n",
  		 pmic_arb->ver_ops->ver_str, hw_ver);
- if (hw_ver < PMIC_ARB_VERSION_V7_MIN)
-		pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS;
-	else
-		pmic_arb->max_periphs = PMIC_ARB_MAX_PERIPHS_V7;
+	err = pmic_arb->ver_ops->get_core_resources(pdev, core);
+	if (err)
+		return err;
err = pmic_arb->ver_ops->init_apid(pmic_arb, 0);
  	if (err)


With that added:

Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>




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