Re: [PATCH 2/2] usb: typec: mux: Add ITE IT5205 Alternate Mode Passive MUX driver

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Il 19/01/24 12:44, Dmitry Baryshkov ha scritto:
On Fri, 19 Jan 2024 at 12:46, AngeloGioacchino Del Regno
<angelogioacchino.delregno@xxxxxxxxxxxxx> wrote:

The ITE IT5202 is a USB Type-C Alternate Mode Passive MUX, used for
muxing the SBU lines of a Type-C port with DisplayPort altmode and
also providing an orientation switch.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
  drivers/usb/typec/mux/Kconfig  |  10 ++
  drivers/usb/typec/mux/Makefile |   1 +
  drivers/usb/typec/mux/it5205.c | 292 +++++++++++++++++++++++++++++++++
  3 files changed, 303 insertions(+)
  create mode 100644 drivers/usb/typec/mux/it5205.c

diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
index d2cb5e733e57..399c7b0983df 100644
--- a/drivers/usb/typec/mux/Kconfig
+++ b/drivers/usb/typec/mux/Kconfig
@@ -36,6 +36,16 @@ config TYPEC_MUX_INTEL_PMC
           control the USB role switch and also the multiplexer/demultiplexer
           switches used with USB Type-C Alternate Modes.

+config TYPEC_MUX_IT5205
+       tristate "ITE IT5205 Type-C USB Alt Mode Passive MUX driver"
+       depends on I2C
+       select REGMAP_I2C
+       help
+         Driver for the ITE IT5205 Type-C USB Alternate Mode Passive MUX
+         which provides support for muxing DisplayPort and sideband signals
+         on a common USB Type-C connector.
+         If compiled as a module, the module will be named it5205.
+
  config TYPEC_MUX_NB7VPQ904M
         tristate "On Semiconductor NB7VPQ904M Type-C redriver driver"
         depends on I2C
diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile
index 57dc9ac6f8dc..bb96f30267af 100644
--- a/drivers/usb/typec/mux/Makefile
+++ b/drivers/usb/typec/mux/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_TYPEC_MUX_FSA4480)         += fsa4480.o
  obj-$(CONFIG_TYPEC_MUX_GPIO_SBU)       += gpio-sbu-mux.o
  obj-$(CONFIG_TYPEC_MUX_PI3USB30532)    += pi3usb30532.o
  obj-$(CONFIG_TYPEC_MUX_INTEL_PMC)      += intel_pmc_mux.o
+obj-$(CONFIG_TYPEC_MUX_IT5205)         += it5205.o
  obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M)     += nb7vpq904m.o
  obj-$(CONFIG_TYPEC_MUX_PTN36502)       += ptn36502.o
  obj-$(CONFIG_TYPEC_MUX_WCD939X_USBSS)  += wcd939x-usbss.o
diff --git a/drivers/usb/typec/mux/it5205.c b/drivers/usb/typec/mux/it5205.c
new file mode 100644
index 000000000000..99203b8a086d
--- /dev/null
+++ b/drivers/usb/typec/mux/it5205.c
@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ITE IT5205 Type-C USB alternate mode passive mux
+ *
+ * Copyright (c) 2020 MediaTek Inc.
+ * Copyright (c) 2024 Collabora Ltd.
+ *                    AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
+ *
+ */
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/usb/typec.h>
+#include <linux/usb/typec_mux.h>
+#include <linux/usb/typec_dp.h>
+#include <linux/regulator/consumer.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio.h>
+#include <linux/usb/tcpm.h>

I'd say, it is a usual custom to sort this list.


Oh, whoops. Totally forgot to do that, sorry - thanks for pointing that out!
Done for v2.

[skipped]

+
+static int it5205_mux_set(struct typec_mux_dev *mux, struct typec_mux_state *state)
+{
+       struct it5205 *it = typec_mux_get_drvdata(mux);
+       u8 val;
+
+       switch (state->mode) {
+       case TYPEC_STATE_USB:
+               val = IT5205_USB;
+               break;
+       case TYPEC_DP_STATE_C:
+               fallthrough;
+       case TYPEC_DP_STATE_E:
+               val = IT5205_DP;
+               break;
+       case TYPEC_DP_STATE_D:
+               val = IT5205_DP_USB;
+               break;
+       case TYPEC_STATE_SAFE:
+               fallthrough;
+       default:
+               val = 0;
+               break;
+       }

Please add a check for state->altmode. All states at TYPEC_STATE_MODAL
and above (which includes TYPEC_DP_STATE_[CDE]) are only relevant with
connection to the particular typec->altmode SVID.


Done for v2.

+
+       return regmap_update_bits(it->regmap, IT5205_REG_MUXCR,
+                                 IT5205_DP_USB_CTRL_MASK, val);
+}
+
+static irqreturn_t it5205_irq_handler(int irq, void *data)
+{
+       struct it5205 *it = data;
+       int ret;
+       u32 val;
+
+       ret = regmap_read(it->regmap, IT5205_REG_ISR, &val);
+       if (ret)
+               return IRQ_NONE;
+
+       if (val & IT5205_ISR_CSBU_OVP) {
+               dev_warn(&it->client->dev, "Overvoltage detected!\n");

Will it cut the voltage automatically?


As far as I understand, yes.
Unfortunately, there's no datasheet.

+
+               /* Reset CSBU */
+               regmap_update_bits(it->regmap, IT5205_REG_CSBUSR,
+                                  IT5205_CSBUSR_SWITCH, 0);
+               regmap_update_bits(it->regmap, IT5205_REG_CSBUSR,
+                                  IT5205_CSBUSR_SWITCH, IT5205_CSBUSR_SWITCH);
+       }
+
+       return IRQ_HANDLED;
+}

The rest LGTM









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