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From: Koichiro Den <den@valinux.co.jp>
To: jingoohan1@gmail.com, mani@kernel.org, lpieralisi@kernel.org,
	kwilczynski@kernel.org, robh@kernel.org, bhelgaas@google.com,
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	linux-rockchip@lists.infradead.org,
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	linux-tegra@vger.kernel.org
Subject: [PATCH v5 2/3] PCI: dwc: Allow glue drivers to return mutable EPC features
Date: Fri,  9 Jan 2026 02:24:02 +0900	[thread overview]
Message-ID: <20260108172403.2629671-3-den@valinux.co.jp> (raw)
In-Reply-To: <20260108172403.2629671-1-den@valinux.co.jp>

The DesignWare EP midlayer needs to advertise additional capabilities at
the DWC layer (e.g. subrange_mapping) without duplicating the same bit
in every DWC-based glue driver and without copying feature structures.

Change dw_pcie_ep_ops.get_features() to return a mutable
struct pci_epc_features * and update all DWC-based glue drivers
accordingly. The DWC midlayer can then adjust/augment the returned
features while still exposing a const struct pci_epc_features * to the
PCI EPC core.

No functional change on its own.

Signed-off-by: Koichiro Den <den@valinux.co.jp>
---
 drivers/pci/controller/dwc/pci-dra7xx.c       |  4 +-
 drivers/pci/controller/dwc/pci-imx6.c         | 10 ++--
 drivers/pci/controller/dwc/pci-keystone.c     |  4 +-
 .../pci/controller/dwc/pci-layerscape-ep.c    |  2 +-
 drivers/pci/controller/dwc/pcie-artpec6.c     |  4 +-
 .../pci/controller/dwc/pcie-designware-plat.c |  4 +-
 drivers/pci/controller/dwc/pcie-designware.h  |  2 +-
 drivers/pci/controller/dwc/pcie-dw-rockchip.c |  8 +--
 drivers/pci/controller/dwc/pcie-keembay.c     |  4 +-
 drivers/pci/controller/dwc/pcie-qcom-ep.c     |  4 +-
 drivers/pci/controller/dwc/pcie-rcar-gen4.c   |  4 +-
 drivers/pci/controller/dwc/pcie-stm32-ep.c    |  4 +-
 drivers/pci/controller/dwc/pcie-tegra194.c    |  4 +-
 drivers/pci/controller/dwc/pcie-uniphier-ep.c | 58 ++++++++++---------
 14 files changed, 60 insertions(+), 56 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 01cfd9aeb0b8..e67f8b7b56cb 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -423,12 +423,12 @@ static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features dra7xx_pcie_epc_features = {
+static struct pci_epc_features dra7xx_pcie_epc_features = {
 	.linkup_notifier = true,
 	.msi_capable = true,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 dra7xx_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	return &dra7xx_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 4668fc9648bf..fe1de30b3df6 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -131,7 +131,7 @@ struct imx_pcie_drvdata {
 	const u32 ltssm_mask;
 	const u32 mode_off[IMX_PCIE_MAX_INSTANCES];
 	const u32 mode_mask[IMX_PCIE_MAX_INSTANCES];
-	const struct pci_epc_features *epc_features;
+	struct pci_epc_features *epc_features;
 	int (*init_phy)(struct imx_pcie *pcie);
 	int (*enable_ref_clk)(struct imx_pcie *pcie, bool enable);
 	int (*core_reset)(struct imx_pcie *pcie, bool assert);
@@ -1386,7 +1386,7 @@ static int imx_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features imx8m_pcie_epc_features = {
+static struct pci_epc_features imx8m_pcie_epc_features = {
 	.msi_capable = true,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
@@ -1395,7 +1395,7 @@ static const struct pci_epc_features imx8m_pcie_epc_features = {
 	.align = SZ_64K,
 };
 
-static const struct pci_epc_features imx8q_pcie_epc_features = {
+static struct pci_epc_features imx8q_pcie_epc_features = {
 	.msi_capable = true,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
@@ -1415,13 +1415,13 @@ static const struct pci_epc_features imx8q_pcie_epc_features = {
  * BAR4	| Enable   | 32-bit  |  1 MB   | Programmable Size
  * BAR5	| Enable   | 32-bit  | 64 KB   | Programmable Size
  */
-static const struct pci_epc_features imx95_pcie_epc_features = {
+static struct pci_epc_features imx95_pcie_epc_features = {
 	.msi_capable = true,
 	.bar[BAR_1] = { .type = BAR_FIXED, .fixed_size = SZ_64K, },
 	.align = SZ_4K,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 imx_pcie_ep_get_features(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index f86d9111f863..4292007a9b3a 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -929,7 +929,7 @@ static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features ks_pcie_am654_epc_features = {
+static struct pci_epc_features ks_pcie_am654_epc_features = {
 	.msi_capable = true,
 	.msix_capable = true,
 	.bar[BAR_0] = { .type = BAR_RESERVED, },
@@ -941,7 +941,7 @@ static const struct pci_epc_features ks_pcie_am654_epc_features = {
 	.align = SZ_64K,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 ks_pcie_am654_get_features(struct dw_pcie_ep *ep)
 {
 	return &ks_pcie_am654_epc_features;
diff --git a/drivers/pci/controller/dwc/pci-layerscape-ep.c b/drivers/pci/controller/dwc/pci-layerscape-ep.c
index a4a800699f89..8d48413050ef 100644
--- a/drivers/pci/controller/dwc/pci-layerscape-ep.c
+++ b/drivers/pci/controller/dwc/pci-layerscape-ep.c
@@ -138,7 +138,7 @@ static int ls_pcie_ep_interrupt_init(struct ls_pcie_ep *pcie,
 	return 0;
 }
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
diff --git a/drivers/pci/controller/dwc/pcie-artpec6.c b/drivers/pci/controller/dwc/pcie-artpec6.c
index f4a136ee2daf..84111d8257f2 100644
--- a/drivers/pci/controller/dwc/pcie-artpec6.c
+++ b/drivers/pci/controller/dwc/pcie-artpec6.c
@@ -369,11 +369,11 @@ static int artpec6_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features artpec6_pcie_epc_features = {
+static struct pci_epc_features artpec6_pcie_epc_features = {
 	.msi_capable = true,
 };
 
-static const struct pci_epc_features *
+static struct pci_epc_features *
 artpec6_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	return &artpec6_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-designware-plat.c b/drivers/pci/controller/dwc/pcie-designware-plat.c
index 12f41886c65d..60ada0eb838e 100644
--- a/drivers/pci/controller/dwc/pcie-designware-plat.c
+++ b/drivers/pci/controller/dwc/pcie-designware-plat.c
@@ -60,12 +60,12 @@ static int dw_plat_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features dw_plat_pcie_epc_features = {
+static struct pci_epc_features dw_plat_pcie_epc_features = {
 	.msi_capable = true,
 	.msix_capable = true,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 dw_plat_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	return &dw_plat_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index f87c67a7a482..4dda9a38d46b 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -449,7 +449,7 @@ struct dw_pcie_ep_ops {
 	void	(*init)(struct dw_pcie_ep *ep);
 	int	(*raise_irq)(struct dw_pcie_ep *ep, u8 func_no,
 			     unsigned int type, u16 interrupt_num);
-	const struct pci_epc_features* (*get_features)(struct dw_pcie_ep *ep);
+	struct pci_epc_features* (*get_features)(struct dw_pcie_ep *ep);
 	/*
 	 * Provide a method to implement the different func config space
 	 * access for different platform, if different func have different
diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
index 352f513ebf03..1f3c91368dc3 100644
--- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
+++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
@@ -100,7 +100,7 @@ struct rockchip_pcie {
 
 struct rockchip_pcie_of_data {
 	enum dw_pcie_device_mode mode;
-	const struct pci_epc_features *epc_features;
+	struct pci_epc_features *epc_features;
 };
 
 static int rockchip_pcie_readl_apb(struct rockchip_pcie *rockchip, u32 reg)
@@ -383,7 +383,7 @@ static int rockchip_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features rockchip_pcie_epc_features_rk3568 = {
+static struct pci_epc_features rockchip_pcie_epc_features_rk3568 = {
 	.linkup_notifier = true,
 	.msi_capable = true,
 	.msix_capable = true,
@@ -403,7 +403,7 @@ static const struct pci_epc_features rockchip_pcie_epc_features_rk3568 = {
  * default.) If the host could write to BAR4, the iATU settings (for all other
  * BARs) would be overwritten, resulting in (all other BARs) no longer working.
  */
-static const struct pci_epc_features rockchip_pcie_epc_features_rk3588 = {
+static struct pci_epc_features rockchip_pcie_epc_features_rk3588 = {
 	.linkup_notifier = true,
 	.msi_capable = true,
 	.msix_capable = true,
@@ -416,7 +416,7 @@ static const struct pci_epc_features rockchip_pcie_epc_features_rk3588 = {
 	.bar[BAR_5] = { .type = BAR_RESIZABLE, },
 };
 
-static const struct pci_epc_features *
+static struct pci_epc_features *
 rockchip_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c
index 60e74ac782af..e6de5289329f 100644
--- a/drivers/pci/controller/dwc/pcie-keembay.c
+++ b/drivers/pci/controller/dwc/pcie-keembay.c
@@ -308,7 +308,7 @@ static int keembay_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	}
 }
 
-static const struct pci_epc_features keembay_pcie_epc_features = {
+static struct pci_epc_features keembay_pcie_epc_features = {
 	.msi_capable		= true,
 	.msix_capable		= true,
 	.bar[BAR_0]		= { .only_64bit = true, },
@@ -320,7 +320,7 @@ static const struct pci_epc_features keembay_pcie_epc_features = {
 	.align			= SZ_16K,
 };
 
-static const struct pci_epc_features *
+static struct pci_epc_features *
 keembay_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	return &keembay_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index f1bc0ac81a92..6ad033301909 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -819,7 +819,7 @@ static void qcom_pcie_ep_init_debugfs(struct qcom_pcie_ep *pcie_ep)
 				    qcom_pcie_ep_link_transition_count);
 }
 
-static const struct pci_epc_features qcom_pcie_epc_features = {
+static struct pci_epc_features qcom_pcie_epc_features = {
 	.linkup_notifier = true,
 	.msi_capable = true,
 	.align = SZ_4K,
@@ -829,7 +829,7 @@ static const struct pci_epc_features qcom_pcie_epc_features = {
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
 };
 
-static const struct pci_epc_features *
+static struct pci_epc_features *
 qcom_pcie_epc_get_features(struct dw_pcie_ep *pci_ep)
 {
 	return &qcom_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-rcar-gen4.c b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
index 80778917d2dd..ff0c4af90eff 100644
--- a/drivers/pci/controller/dwc/pcie-rcar-gen4.c
+++ b/drivers/pci/controller/dwc/pcie-rcar-gen4.c
@@ -419,7 +419,7 @@ static int rcar_gen4_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
+static struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	.msi_capable = true,
 	.bar[BAR_1] = { .type = BAR_RESERVED, },
 	.bar[BAR_3] = { .type = BAR_RESERVED, },
@@ -428,7 +428,7 @@ static const struct pci_epc_features rcar_gen4_pcie_epc_features = {
 	.align = SZ_1M,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 rcar_gen4_pcie_ep_get_features(struct dw_pcie_ep *ep)
 {
 	return &rcar_gen4_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-stm32-ep.c b/drivers/pci/controller/dwc/pcie-stm32-ep.c
index 2cecf32d2b0f..8a892def54f5 100644
--- a/drivers/pci/controller/dwc/pcie-stm32-ep.c
+++ b/drivers/pci/controller/dwc/pcie-stm32-ep.c
@@ -69,12 +69,12 @@ static int stm32_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	}
 }
 
-static const struct pci_epc_features stm32_pcie_epc_features = {
+static struct pci_epc_features stm32_pcie_epc_features = {
 	.msi_capable = true,
 	.align = SZ_64K,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 stm32_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	return &stm32_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index 0ddeef70726d..06f45a17e52c 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -1987,7 +1987,7 @@ static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features tegra_pcie_epc_features = {
+static struct pci_epc_features tegra_pcie_epc_features = {
 	.linkup_notifier = true,
 	.msi_capable = true,
 	.bar[BAR_0] = { .type = BAR_FIXED, .fixed_size = SZ_1M,
@@ -2000,7 +2000,7 @@ static const struct pci_epc_features tegra_pcie_epc_features = {
 	.align = SZ_64K,
 };
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 tegra_pcie_ep_get_features(struct dw_pcie_ep *ep)
 {
 	return &tegra_pcie_epc_features;
diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
index d6e73811216e..ddb5ff70340c 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
@@ -82,7 +82,7 @@ struct uniphier_pcie_ep_soc_data {
 	bool has_gio;
 	void (*init)(struct uniphier_pcie_ep_priv *priv);
 	int (*wait)(struct uniphier_pcie_ep_priv *priv);
-	const struct pci_epc_features features;
+	struct pci_epc_features *features;
 };
 
 #define to_uniphier_pcie(x)	dev_get_drvdata((x)->dev)
@@ -273,13 +273,13 @@ static int uniphier_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 	return 0;
 }
 
-static const struct pci_epc_features*
+static struct pci_epc_features*
 uniphier_pcie_get_features(struct dw_pcie_ep *ep)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 	struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
 
-	return &priv->data->features;
+	return priv->data->features;
 }
 
 static const struct dw_pcie_ep_ops uniphier_pcie_ep_ops = {
@@ -415,40 +415,44 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static struct pci_epc_features uniphier_pro5_features = {
+	.linkup_notifier = false,
+	.msi_capable = true,
+	.msix_capable = false,
+	.align = 1 << 16,
+	.bar[BAR_0] = { .only_64bit = true, },
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .only_64bit = true, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_4] = { .type = BAR_RESERVED, },
+	.bar[BAR_5] = { .type = BAR_RESERVED, },
+};
+
+static struct pci_epc_features uniphier_nx1_features = {
+	.linkup_notifier = false,
+	.msi_capable = true,
+	.msix_capable = false,
+	.align = 1 << 12,
+	.bar[BAR_0] = { .only_64bit = true, },
+	.bar[BAR_1] = { .type = BAR_RESERVED, },
+	.bar[BAR_2] = { .only_64bit = true, },
+	.bar[BAR_3] = { .type = BAR_RESERVED, },
+	.bar[BAR_4] = { .only_64bit = true, },
+	.bar[BAR_5] = { .type = BAR_RESERVED, },
+};
+
 static const struct uniphier_pcie_ep_soc_data uniphier_pro5_data = {
 	.has_gio = true,
 	.init = uniphier_pcie_pro5_init_ep,
 	.wait = NULL,
-	.features = {
-		.linkup_notifier = false,
-		.msi_capable = true,
-		.msix_capable = false,
-		.align = 1 << 16,
-		.bar[BAR_0] = { .only_64bit = true, },
-		.bar[BAR_1] = { .type = BAR_RESERVED, },
-		.bar[BAR_2] = { .only_64bit = true, },
-		.bar[BAR_3] = { .type = BAR_RESERVED, },
-		.bar[BAR_4] = { .type = BAR_RESERVED, },
-		.bar[BAR_5] = { .type = BAR_RESERVED, },
-	},
+	.features = &uniphier_pro5_features,
 };
 
 static const struct uniphier_pcie_ep_soc_data uniphier_nx1_data = {
 	.has_gio = false,
 	.init = uniphier_pcie_nx1_init_ep,
 	.wait = uniphier_pcie_nx1_wait_ep,
-	.features = {
-		.linkup_notifier = false,
-		.msi_capable = true,
-		.msix_capable = false,
-		.align = 1 << 12,
-		.bar[BAR_0] = { .only_64bit = true, },
-		.bar[BAR_1] = { .type = BAR_RESERVED, },
-		.bar[BAR_2] = { .only_64bit = true, },
-		.bar[BAR_3] = { .type = BAR_RESERVED, },
-		.bar[BAR_4] = { .only_64bit = true, },
-		.bar[BAR_5] = { .type = BAR_RESERVED, },
-	},
+	.features = &uniphier_nx1_features,
 };
 
 static const struct of_device_id uniphier_pcie_ep_match[] = {
-- 
2.51.0



  parent reply	other threads:[~2026-01-08 20:46 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-08 17:24 [PATCH v5 0/3] PCI: endpoint: BAR subrange mapping support Koichiro Den
2026-01-08 17:24 ` [PATCH v5 1/3] PCI: endpoint: Add " Koichiro Den
2026-01-08 17:24 ` Koichiro Den [this message]
2026-01-08 17:24 ` [PATCH v5 3/3] PCI: dwc: ep: Support BAR subrange inbound mapping via Address Match Mode iATU Koichiro Den
2026-01-08 20:55   ` Niklas Cassel
2026-01-09  7:29     ` Koichiro Den
2026-01-09  8:30       ` Niklas Cassel
2026-01-10 14:29         ` Koichiro Den
2026-01-12 11:43           ` Niklas Cassel
2026-01-13  2:40             ` Koichiro Den
2026-01-13  2:18   ` Koichiro Den

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