linux-kernel - [PATCH v2 6/6] i2c: qcom-geni: add support for I2C Master Hub variant

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Message-Id: <20221114-narmstrong-sm8550-upstream-i2c-master-hub-v2-6-aadaa6997b28@linaro.org>
Date:   Fri, 18 Nov 2022 09:45:10 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: [PATCH v2 6/6] i2c: qcom-geni: add support for I2C Master Hub variant

The I2C Master Hub is a stripped down version of the GENI Serial Engine
QUP Wrapper Controller but only supporting I2C serial engines without
DMA support.

Add the I2C Master Hub serial engine compatible along the specific
requirements in a new desc struct passed through the device match data.

Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/i2c/busses/i2c-qcom-geni.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c
index 75dd0718c5a1..bfe75038bc14 100644
--- a/drivers/i2c/busses/i2c-qcom-geni.c
+++ b/drivers/i2c/busses/i2c-qcom-geni.c
@@ -1026,8 +1026,16 @@ static const struct dev_pm_ops geni_i2c_pm_ops = {
 									NULL)
 };
 
+const struct geni_i2c_desc i2c_master_hub = {
+	.has_core_clk = true,
+	.icc_ddr = NULL,
+	.no_dma_support = true,
+	.tx_fifo_depth = 16,
+};
+
 static const struct of_device_id geni_i2c_dt_match[] = {
 	{ .compatible = "qcom,geni-i2c" },
+	{ .compatible = "qcom,geni-i2c-master-hub", .data = &i2c_master_hub },
 	{}
 };
 MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);

-- 
b4 0.10.1